Soldered USB port to ARCHER C6, but it doesn't show up in dmesg. What next?

Hi.
I am very new to OpenWRT, but I am no stranger to soldering and electronics. I've recently installed OpenWRT on my Archer C6 and in the device page I saw section Potential USB 2.0 Support with USB pins labeled.
It took a few hours but I managed to solder 0.1mm wires to pins USB_DP0 and USB_DM0 according to the page. The SoC's pin-pitch isn't 0.5 mm as the section says, but 0.25: The process involved a lot of frustrated cursing, but I was successful.
I verified that the pins aren't shorted together and to their neighboring pins, and I was able to measure the ESD protection diodes on both of them, so I am sure that the wires are indeed making good connection to the pins. I also added a simple 5 volt regulator.

During testing, I was not able to get any sign of the USB peripheral working. I tried to follow the Installing and Troubleshooting USB Drivers wiki page, but I didn't see any USB activity in dmesg and no root hubs are showing. Logically, plugging and unplugging devices didn't cause any update either. Running lsusb resulted in following error:

# lsusb
unable to initialize libusb: -99

I don't really have much idea what else is needed to enable the USB peripheral. I will appreciate any help troubleshooting this, and any advice.

Here are some more informations which I'm hoping might be useful:

# dmesg | grep usb
[   11.349784] usbcore: registered new interface driver usbfs
[   11.355584] usbcore: registered new interface driver hub
[   11.361144] usbcore: registered new device driver usb
[   11.964522] usbcore: registered new interface driver usb-storage
[   12.165134] usbcore: registered new interface driver uas

# dmesg | grep uhci
[   11.755568] uhci_hcd: USB Universal Host Controller Interface driver

\# opkg list-installed | grep usb
kmod-phy-ath79-usb - 4.14.221-1
kmod-usb-core - 4.14.221-1
kmod-usb-ehci - 4.14.221-1
kmod-usb-storage - 4.14.221-1
kmod-usb-storage-uas - 4.14.221-1
kmod-usb-uhci - 4.14.221-1
kmod-usb2 - 4.14.221-1
kmod-usb2-pci - 4.14.221-1
libusb-1.0-0 - 1.0.22-2
usbutils - 007-10
# cat /sys/kernel/debug/usb/devices
(No output)

Not sure if this helps, but here is the output for cat /sys/kernel/debug/usb/devices on a C7 v2 (uses the same QCA9563 as the C6):

 -----------------------------------------------------
 OpenWrt 19.07.7, r11306-c4a6851c72
 -----------------------------------------------------
root@OpenWrt:~# cat /sys/kernel/debug/usb/devices

T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 1
B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 4.14
S:  Manufacturer=Linux 4.14.221 ehci_hcd
S:  Product=EHCI Host Controller
S:  SerialNumber=1b000000.usb
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 1
B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 4.14
S:  Manufacturer=Linux 4.14.221 ehci_hcd
S:  Product=EHCI Host Controller
S:  SerialNumber=1b400000.usb
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

Just a shot in the dark here - but try turning the C6 off and plugging in various USB devices, then power it on to see if it auto configures / recognizes? Nice soldering by the way!!!

More C7 output...

root@OpenWrt:~# dmesg | grep usb
[    0.317973] ar7200-usb-phy 18030000.usb-phy0: phy reset is missing
[    0.324637] ar7200-usb-phy 18030010.usb-phy1: phy reset is missing
[    4.070306] usbcore: registered new interface driver usbfs
[    4.075989] usbcore: registered new interface driver hub
[    4.081447] usbcore: registered new device driver usb
[    4.105100] ehci-platform 1b000000.usb: EHCI Host Controller
[    4.110885] ehci-platform 1b000000.usb: new USB bus registered, assigned bus number 1
[    4.118923] ehci-platform 1b000000.usb: irq 14, io mem 0x1b000000
[    4.153481] ehci-platform 1b000000.usb: USB 2.0 started, EHCI 1.00
[    4.169056] ehci-platform 1b400000.usb: EHCI Host Controller
[    4.174873] ehci-platform 1b400000.usb: new USB bus registered, assigned bus number 2
[    4.182887] ehci-platform 1b400000.usb: irq 15, io mem 0x1b400000
[    4.213437] ehci-platform 1b400000.usb: USB 2.0 started, EHCI 1.00

Note: I don't get any output for dmesg | grep uhci

root@OpenWrt:~# lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

root@OpenWrt:~# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-platform/1p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-platform/1p, 480M

root@OpenWrt:~# opkg list-installed | grep usb
kmod-phy-ath79-usb - 4.14.221-1
kmod-usb-core - 4.14.221-1
kmod-usb-ehci - 4.14.221-1
kmod-usb-ledtrig-usbport - 4.14.221-1
kmod-usb2 - 4.14.221-1
libusb-1.0-0 - 1.0.22-2
usbutils - 007-10

Crazy idea:

I wonder if you could install the C7 firmware without bricking the C6?

Better idea:

More likely you would have to compile a custom firmware - try comparing the C7 to the C6 to see whats added/missing?

 -----------------------------------------------------
 OpenWrt 19.07.7, r11306-c4a6851c72
 -----------------------------------------------------
root@OpenWrt:~# dmesg
[    0.000000] Linux version 4.14.221 (builder@buildhost) (gcc version 7.5.0 (OpenWrt GCC 7.5.0 r11306-c4a6851c72)) #0 Mon Feb 15 15:22:37 2021
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 00019750 (MIPS 74Kc)
[    0.000000] MIPS: machine is TP-Link Archer C7 v2
[    0.000000] SoC: Qualcomm Atheros QCA9558 ver 1 rev 0
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 08000000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] On node 0 totalpages: 32768
[    0.000000] free_area_init_node: node 0, pgdat 804fdf80, node_mem_map 81008c20
[    0.000000]   Normal zone: 256 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 32768 pages, LIFO batch:7
[    0.000000] random: get_random_bytes called from 0x80501740 with crng_init=0
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 32512
[    0.000000] Kernel command line: console=ttyS0,115200n8 rootfstype=squashfs,jffs2
[    0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 123300K/131072K available (4037K kernel code, 163K rwdata, 532K rodata, 1212K init, 212K bss, 7772K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS: 51
[    0.000000] CPU clock: 720.000 MHz
[    0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 5309056796 ns
[    0.000007] sched_clock: 32 bits at 360MHz, resolution 2ns, wraps every 5965232126ns
[    0.008305] Calibrating delay loop... 358.80 BogoMIPS (lpj=1794048)
[    0.074993] pid_max: default: 32768 minimum: 301
[    0.080071] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.087103] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.098160] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.108657] futex hash table entries: 256 (order: -1, 3072 bytes)
[    0.115206] pinctrl core: initialized pinctrl subsystem
[    0.122610] NET: Registered protocol family 16
[    0.130380] PCI host bridge /ahb/pcie-controller@18250000 ranges:
[    0.136910]  MEM 0x0000000012000000..0x0000000013ffffff
[    0.142464]   IO 0x0000000000000001..0x0000000000000001
[    0.161865] PCI host bridge to bus 0000:00
[    0.166228] pci_bus 0000:00: root bus resource [mem 0x12000000-0x13ffffff]
[    0.173576] pci_bus 0000:00: root bus resource [io  0x0001]
[    0.179501] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[    0.186731] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[    0.195184] pci 0000:00:00.0: [168c:003c] type 00 class 0x028000
[    0.195238] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x001fffff 64bit]
[    0.195292] pci 0000:00:00.0: reg 0x30: [mem 0x00000000-0x0000ffff pref]
[    0.195365] pci 0000:00:00.0: supports D1 D2
[    0.195537] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
[    0.195561] pci 0000:00:00.0: BAR 0: assigned [mem 0x12000000-0x121fffff 64bit]
[    0.203381] pci 0000:00:00.0: BAR 6: assigned [mem 0x12200000-0x1220ffff pref]
[    0.213405] clocksource: Switched to clocksource MIPS
[    0.219600] NET: Registered protocol family 2
[    0.224979] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[    0.232400] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[    0.239211] TCP: Hash tables configured (established 1024 bind 1024)
[    0.246092] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.252316] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.259222] NET: Registered protocol family 1
[    0.263919] PCI: CLS 0 bytes, default 32
[    0.266258] Crashlog allocated RAM at address 0x3f00000
[    0.272826] workingset: timestamp_bits=30 max_order=15 bucket_order=0
[    0.283814] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.290016] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.308008] io scheduler noop registered
[    0.312184] io scheduler deadline registered (default)
[    0.317973] ar7200-usb-phy 18030000.usb-phy0: phy reset is missing
[    0.324637] ar7200-usb-phy 18030010.usb-phy1: phy reset is missing
[    0.332784] pinctrl-single 1804002c.pinmux: 544 pins at pa b804002c size 68
[    0.340723] gpio-export gpio-export: 2 gpio(s) exported
[    0.347046] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    0.355786] console [ttyS0] disabled
[    0.359616] 18020000.uart: ttyS0 at MMIO 0x18020000 (irq = 9, base_baud = 2500000) is a 16550A
[    0.368831] console [ttyS0] enabled
[    0.376259] bootconsole [early0] disabled
[    0.402133] m25p80 spi0.0: w25q128 (16384 Kbytes)
[    0.406983] 3 fixed-partitions partitions found on MTD device spi0.0
[    0.413441] Creating 3 MTD partitions on "spi0.0":
[    0.418307] 0x000000000000-0x000000020000 : "u-boot"
[    0.424027] 0x000000020000-0x000000ff0000 : "firmware"
[    0.430193] 2 tplink-fw partitions found on MTD device firmware
[    0.436240] Creating 2 MTD partitions on "firmware":
[    0.441283] 0x000000000000-0x000000186971 : "kernel"
[    0.446922] 0x000000186974-0x000000fd0000 : "rootfs"
[    0.452532] mtd: device 3 (rootfs) set to be root filesystem
[    0.458376] 1 squashfs-split partitions found on MTD device rootfs
[    0.464673] 0x000000440000-0x000000fd0000 : "rootfs_data"
[    0.470746] 0x000000ff0000-0x000001000000 : "art"
[    0.477117] libphy: Fixed MDIO Bus: probed
[    0.815112] libphy: ag71xx_mdio: probed
[    0.821633] switch0: Atheros AR8327 rev. 4 switch registered on mdio-bus.0
[    1.472711] ag71xx 19000000.eth: connected to PHY at mdio-bus.0:00 [uid=004dd034, driver=Atheros AR8216/AR8236/AR8316]
[    1.484095] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode: rgmii
[    1.824997] ag71xx 1a000000.eth: connected to PHY at fixed-0:00 [uid=00000000, driver=Generic PHY]
[    1.834609] eth1: Atheros AG71xx at 0xba000000, irq 5, mode: sgmii
[    1.843029] NET: Registered protocol family 10
[    1.851921] Segment Routing with IPv6
[    1.855770] NET: Registered protocol family 17
[    1.860320] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[    1.873480] 8021q: 802.1Q VLAN Support v1.8
[    1.879922] hctosys: unable to open rtc device (rtc0)
[    1.891279] VFS: Mounted root (squashfs filesystem) readonly on device 31:3.
[    1.902826] Freeing unused kernel memory: 1212K
[    1.907447] This architecture does not have kernel memory protection.
[    2.583420] random: fast init done
[    2.616469] init: Console is alive
[    2.620097] init: - watchdog -
[    3.805544] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[    4.070306] usbcore: registered new interface driver usbfs
[    4.075989] usbcore: registered new interface driver hub
[    4.081447] usbcore: registered new device driver usb
[    4.091495] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    4.099529] ehci-platform: EHCI generic platform driver
[    4.105100] ehci-platform 1b000000.usb: EHCI Host Controller
[    4.110885] ehci-platform 1b000000.usb: new USB bus registered, assigned bus number 1
[    4.118923] ehci-platform 1b000000.usb: irq 14, io mem 0x1b000000
[    4.153481] ehci-platform 1b000000.usb: USB 2.0 started, EHCI 1.00
[    4.160439] hub 1-0:1.0: USB hub found
[    4.164571] hub 1-0:1.0: 1 port detected
[    4.169056] ehci-platform 1b400000.usb: EHCI Host Controller
[    4.174873] ehci-platform 1b400000.usb: new USB bus registered, assigned bus number 2
[    4.182887] ehci-platform 1b400000.usb: irq 15, io mem 0x1b400000
[    4.213437] ehci-platform 1b400000.usb: USB 2.0 started, EHCI 1.00
[    4.220404] hub 2-0:1.0: USB hub found
[    4.224536] hub 2-0:1.0: 1 port detected
[    4.229544] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[    4.247263] init: - preinit -
[    5.238126] random: jshn: uninitialized urandom read (4 bytes read)
[    5.430165] random: jshn: uninitialized urandom read (4 bytes read)
[    5.597612] random: jshn: uninitialized urandom read (4 bytes read)
[    6.925731] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[    6.931708] IPv6: ADDRCONF(NETDEV_UP): eth1.1: link is not ready
[    6.973071] urandom_read: 4 callbacks suppressed
[    6.973078] random: procd: uninitialized urandom read (4 bytes read)
[    7.954544] eth1: link up (1000Mbps/Full duplex)
[    7.959248] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[    7.965922] IPv6: ADDRCONF(NETDEV_CHANGE): eth1.1: link becomes ready
[   10.246342] jffs2: notice: (489) jffs2_build_xattr_subsystem: complete building xattr subsystem, 10 of xdatum (3 unchecked, 7 orphan) and 95 of xref (23 dead, 6 orphan) found.
[   10.266540] mount_root: switching to jffs2 overlay
[   10.291261] overlayfs: upper fs does not support tmpfile.
[   10.305927] urandom-seed: Seeding with /etc/urandom.seed
[   10.595153] eth1: link down
[   10.614188] procd: - early -
[   10.617199] procd: - watchdog -
[   11.283164] procd: - watchdog -
[   11.286650] procd: - ubus -
[   11.301019] random: ubusd: uninitialized urandom read (4 bytes read)
[   11.361322] random: ubusd: uninitialized urandom read (4 bytes read)
[   11.368989] procd: - init -
[   12.666116] urngd: v1.0.2 started.
[   12.878900] kmodloader: loading kernel modules from /etc/modules.d/*
[   12.903308] random: crng init done
[   12.915056] ip6_tables: (C) 2000-2006 Netfilter Core Team
[   12.938111] Netfilter messages via NETLINK v0.30.
[   12.965168] ip_set: protocol 6
[   13.239872] Loading modules backported from Linux version v4.19.161-0-gdaefdc9eb24b
[   13.247690] Backport generated by backports.git v4.19.161-1-0-g4bb568fe
[   13.275629] ip_tables: (C) 2000-2006 Netfilter Core Team
[   13.301553] nf_conntrack version 0.5.0 (2048 buckets, 8192 max)
[   13.346732] ctnetlink v0.93: registering with nfnetlink.
[   13.659702] wireguard: WireGuard 1.0.20200611 loaded. See www.wireguard.com for information.
[   13.668313] wireguard: Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
[   13.724166] xt_time: kernel timezone is -0000
[   13.827954] PPP generic driver version 2.4.2
[   13.844250] NET: Registered protocol family 24
[   13.896106] ath10k 4.19 driver, optimized for CT firmware, probing pci device: 0x3c.
[   13.914148] PCI: Enabling device 0000:00:00.0 (0000 -> 0002)
[   13.920044] ath10k_pci 0000:00:00.0: pci irq legacy oper_irq_mode 1 irq_mode 0 reset_mode 0
[   14.234017] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/fwcfg-pci-0000:00:00.0.txt failed with error -2
[   14.244730] ath10k_pci 0000:00:00.0: Falling back to user helper
[   14.556168] firmware ath10k!fwcfg-pci-0000:00:00.0.txt: firmware_loading_store: map pages failed
[   14.565378] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:00:00.0.bin failed with error -2
[   14.576262] ath10k_pci 0000:00:00.0: Falling back to user helper
[   14.758099] firmware ath10k!pre-cal-pci-0000:00:00.0.bin: firmware_loading_store: map pages failed
[   14.769891] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/ct-firmware-5.bin failed with error -2
[   14.781051] ath10k_pci 0000:00:00.0: Falling back to user helper
[   14.961603] firmware ath10k!QCA988X!hw2.0!ct-firmware-5.bin: firmware_loading_store: map pages failed
[   14.971225] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/ct-firmware-2.bin failed with error -2
[   14.982371] ath10k_pci 0000:00:00.0: Falling back to user helper
[   15.170826] firmware ath10k!QCA988X!hw2.0!ct-firmware-2.bin: firmware_loading_store: map pages failed
[   15.180460] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/firmware-6.bin failed with error -2
[   15.191346] ath10k_pci 0000:00:00.0: Falling back to user helper
[   15.375069] firmware ath10k!QCA988X!hw2.0!firmware-6.bin: firmware_loading_store: map pages failed
[   15.384434] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/firmware-5.bin failed with error -2
[   15.395320] ath10k_pci 0000:00:00.0: Falling back to user helper
[   15.577171] firmware ath10k!QCA988X!hw2.0!firmware-5.bin: firmware_loading_store: map pages failed
[   15.586535] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/firmware-4.bin failed with error -2
[   15.597421] ath10k_pci 0000:00:00.0: Falling back to user helper
[   15.797458] firmware ath10k!QCA988X!hw2.0!firmware-4.bin: firmware_loading_store: map pages failed
[   15.806832] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/firmware-3.bin failed with error -2
[   15.817720] ath10k_pci 0000:00:00.0: Falling back to user helper
[   16.000834] firmware ath10k!QCA988X!hw2.0!firmware-3.bin: firmware_loading_store: map pages failed
[   16.215067] ath10k_pci 0000:00:00.0: qca988x hw2.0 target 0x4100016c chip_id 0x043202ff sub 0000:0000
[   16.224455] ath10k_pci 0000:00:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[   16.236896] ath10k_pci 0000:00:00.0: firmware ver 10.1-ct-8x-__fW-022-538f0906 api 2 features wmi-10.x,has-wmi-mgmt-tx,mfp,txstatus-noack,wmi-10.x-CT,ratemask-CT,txrate-CT,get-temp-CT,tx-rc-CT,cust-stats-CT,retry-gt2-CT,txrate2-CT,beacon-cb-CT,wmi-block-ack-CT crc32 e1c91a74
[   16.289827] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/board-2.bin failed with error -2
[   16.300443] ath10k_pci 0000:00:00.0: Falling back to user helper
[   16.404949] firmware ath10k!QCA988X!hw2.0!board-2.bin: firmware_loading_store: map pages failed
[   16.414209] ath10k_pci 0000:00:00.0: board_file api 1 bmi_id N/A crc32 bebc7c08
[   17.941228] ath10k_pci 0000:00:00.0: 10.1 wmi init: vdevs: 16  peers: 127  tid: 256
[   17.958006] ath10k_pci 0000:00:00.0: wmi print 'P 128 V 8 T 410'
[   17.964339] ath10k_pci 0000:00:00.0: wmi print 'msdu-desc: 1424  sw-crypt: 0 ct-sta: 0'
[   17.972467] ath10k_pci 0000:00:00.0: wmi print 'alloc rem: 20984 iram: 25656'
[   18.022328] ath10k_pci 0000:00:00.0: htt-ver 2.1 wmi-op 2 htt-op 2 cal file max-sta 128 raw 0 hwcrypto 1
[   18.035255] ath10k_pci 0000:00:00.0: NOTE:  Firmware DBGLOG output disabled in debug_mask: 0x10000000
[   18.296382] ath: EEPROM regdomain: 0x0
[   18.296388] ath: EEPROM indicates default country code should be used
[   18.296391] ath: doing EEPROM country->regdmn map search
[   18.296404] ath: country maps to regdmn code: 0x3a
[   18.296409] ath: Country alpha2 being used: US
[   18.296413] ath: Regpair used: 0x3a
[   18.360467] ath: EEPROM regdomain: 0x0
[   18.360474] ath: EEPROM indicates default country code should be used
[   18.360478] ath: doing EEPROM country->regdmn map search
[   18.360491] ath: country maps to regdmn code: 0x3a
[   18.360495] ath: Country alpha2 being used: US
[   18.360499] ath: Regpair used: 0x3a
[   18.377979] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[   18.379432] ieee80211 phy1: Atheros AR9550 Rev:0 mem=0xb8100000, irq=12
[   18.475020] kmodloader: done loading kernel modules from /etc/modules.d/*
[   29.777620] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[   29.784741] eth1: link up (1000Mbps/Full duplex)
[   29.789440] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[   29.811564] br-lan: port 1(eth1.1) entered blocking state
[   29.817095] br-lan: port 1(eth1.1) entered disabled state
[   29.822817] device eth1.1 entered promiscuous mode
[   29.827816] device eth1 entered promiscuous mode
[   29.880310] br-lan: port 1(eth1.1) entered blocking state
[   29.885834] br-lan: port 1(eth1.1) entered forwarding state
[   29.891629] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
[   30.008349] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   30.049098] IPv6: ADDRCONF(NETDEV_UP): eth0.2: link is not ready
[   30.834486] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[   31.074730] eth0: link up (1000Mbps/Full duplex)
[   31.079481] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   31.158346] IPv6: ADDRCONF(NETDEV_CHANGE): eth0.2: link becomes ready
[ 1652.126156] conntrack: generic helper won't handle protocol 47. Please consider loading the specific helper module.

*haha I have the wrong wifi drivers installed - thanks!

I suppose that &usb/&usb_phy should be enabled in the DTS prior to building the image. Just a guess.

1 Like

You should see the host controller even with no hardware connection to the pins.

Most of the older chips also needed a bias resistor external to the chip to make the USB port work.

1 Like

Thank you @16F84 Whole bunch of USB stuff is indeed missing from my dmesg, namely:

ar7200-usb-phy 18030000.usb-phy0: phy reset is missing
ar7200-usb-phy 18030010.usb-phy1: phy reset is missing

and

usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ehci-platform: EHCI generic platform driver
ehci-platform 1b000000.usb: EHCI Host Controller
ehci-platform 1b000000.usb: new USB bus registered, assigned bus number 1
ehci-platform 1b000000.usb: irq 14, io mem 0x1b000000
ehci-platform 1b000000.usb: USB 2.0 started, EHCI 1.00
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
ehci-platform 1b400000.usb: EHCI Host Controller
ehci-platform 1b400000.usb: new USB bus registered, assigned bus number 2
ehci-platform 1b400000.usb: irq 15, io mem 0x1b400000
ehci-platform 1b400000.usb: USB 2.0 started, EHCI 1.00
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected

For completness, here's my complete dmesg:

[    0.000000] Linux version 4.14.221 (builder@buildhost) (gcc version 7.5.0 (OpenWrt GCC 7.5.0 r11306-c4a6851c72)) #0 Mon Feb 15 15:22:37 2021
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 00019750 (MIPS 74Kc)
[    0.000000] MIPS: machine is TP-Link Archer C6 v2
[    0.000000] SoC: Qualcomm Atheros QCA956X ver 1 rev 0
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 08000000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] On node 0 totalpages: 32768
[    0.000000] free_area_init_node: node 0, pgdat 804fdf80, node_mem_map 81008000
[    0.000000]   Normal zone: 256 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 32768 pages, LIFO batch:7
[    0.000000] random: get_random_bytes called from 0x80501740 with crng_init=0
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 32512
[    0.000000] Kernel command line: console=ttyS0,115200n8 rootfstype=squashfs,jffs2
[    0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 123300K/131072K available (4037K kernel code, 163K rwdata, 532K rodata, 1212K init, 212K bss, 7772K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS: 51
[    0.000000] CPU clock: 775.000 MHz
[    0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 4932285024 ns
[    0.000007] sched_clock: 32 bits at 387MHz, resolution 2ns, wraps every 5541893118ns
[    0.008238] Calibrating delay loop... 385.84 BogoMIPS (lpj=1929216)
[    0.074781] pid_max: default: 32768 minimum: 301
[    0.079805] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.086795] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.097705] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.108100] futex hash table entries: 256 (order: -1, 3072 bytes)
[    0.114593] pinctrl core: initialized pinctrl subsystem
[    0.122159] NET: Registered protocol family 16
[    0.129642] PCI host bridge /ahb/pcie-controller@18250000 ranges:
[    0.136123]  MEM 0x0000000012000000..0x0000000013ffffff
[    0.141625]   IO 0x0000000000000000..0x0000000000000000
[    0.161262] PCI host bridge to bus 0000:00
[    0.165587] pci_bus 0000:00: root bus resource [mem 0x12000000-0x13ffffff]
[    0.172871] pci_bus 0000:00: root bus resource [io  0x0000]
[    0.178742] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[    0.185906] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[    0.194278] pci 0000:00:00.0: [168c:0056] type 00 class 0x028000
[    0.194334] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x001fffff 64bit]
[    0.194455] pci 0000:00:00.0: PME# supported from D0 D3hot
[    0.194626] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
[    0.194649] pci 0000:00:00.0: BAR 0: assigned [mem 0x12000000-0x121fffff 64bit]
[    0.204955] clocksource: Switched to clocksource MIPS
[    0.211172] NET: Registered protocol family 2
[    0.216544] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[    0.223892] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[    0.230647] TCP: Hash tables configured (established 1024 bind 1024)
[    0.237485] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.243650] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.250511] NET: Registered protocol family 1
[    0.255179] PCI: CLS 0 bytes, default 32
[    0.257730] Crashlog allocated RAM at address 0x3f00000
[    0.264382] workingset: timestamp_bits=30 max_order=15 bucket_order=0
[    0.275471] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.281616] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.300226] io scheduler noop registered
[    0.304363] io scheduler deadline registered (default)
[    0.311459] pinctrl-single 1804002c.pinmux: 544 pins at pa b804002c size 68
[    0.319744] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    0.328524] console [ttyS0] disabled
[    0.332328] 18020000.uart: ttyS0 at MMIO 0x18020000 (irq = 9, base_baud = 1562500) is a 16550A
[    0.341460] console [ttyS0] enabled
[    0.349023] bootconsole [early0] disabled
[    0.367111] m25p80 spi0.0: gd25q64 (8192 Kbytes)
[    0.371925] 5 fixed-partitions partitions found on MTD device spi0.0
[    0.378529] Creating 5 MTD partitions on "spi0.0":
[    0.383487] 0x000000000000-0x000000020000 : "u-boot"
[    0.389312] 0x000000020000-0x000000030000 : "mac"
[    0.394797] 0x000000030000-0x0000007d0000 : "firmware"
[    0.403192] 2 uimage-fw partitions found on MTD device firmware
[    0.409353] Creating 2 MTD partitions on "firmware":
[    0.414486] 0x000000000000-0x000000190000 : "kernel"
[    0.420287] 0x000000190000-0x0000007a0000 : "rootfs"
[    0.426051] mtd: device 4 (rootfs) set to be root filesystem
[    0.431929] 1 squashfs-split partitions found on MTD device rootfs
[    0.438356] 0x000000480000-0x0000007a0000 : "rootfs_data"
[    0.444579] 0x0000007d0000-0x0000007f0000 : "tplink"
[    0.450401] 0x0000007f0000-0x000000800000 : "art"
[    0.456943] libphy: Fixed MDIO Bus: probed
[    1.135322] libphy: ag71xx_mdio: probed
[    1.142281] switch0: Atheros AR8337 rev. 2 switch registered on mdio-bus.0
[    1.796423] ag71xx 19000000.eth: connected to PHY at mdio-bus.0:00 [uid=004dd036, driver=Atheros AR8216/AR8236/AR8316]
[    1.808030] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode: sgmii
[    1.816758] NET: Registered protocol family 10
[    1.826167] Segment Routing with IPv6
[    1.830040] NET: Registered protocol family 17
[    1.834668] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[    1.848083] 8021q: 802.1Q VLAN Support v1.8
[    1.853800] hctosys: unable to open rtc device (rtc0)
[    1.864267] VFS: Mounted root (squashfs filesystem) readonly on device 31:4.
[    1.878342] Freeing unused kernel memory: 1212K
[    1.883022] This architecture does not have kernel memory protection.
[    2.518386] init: Console is alive
[    2.522091] init: - watchdog -
[    2.564989] random: fast init done
[    3.554667] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[    3.594453] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[    3.612721] init: - preinit -
[    4.420945] random: jshn: uninitialized urandom read (4 bytes read)
[    4.529922] random: jshn: uninitialized urandom read (4 bytes read)
[    4.700572] random: jshn: uninitialized urandom read (4 bytes read)
[    6.037592] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    6.043686] IPv6: ADDRCONF(NETDEV_UP): eth0.1: link is not ready
[    6.084474] urandom_read: 4 callbacks suppressed
[    6.084481] random: procd: uninitialized urandom read (4 bytes read)
[    7.076283] eth0: link up (1000Mbps/Full duplex)
[    7.081141] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[    7.087948] IPv6: ADDRCONF(NETDEV_CHANGE): eth0.1: link becomes ready
[    9.318470] jffs2: notice: (458) jffs2_build_xattr_subsystem: complete building xattr subsystem, 10 of xdatum (0 unchecked, 7 orphan) and 53 of xref (9 dead, 0 orphan) found.
[    9.338071] mount_root: switching to jffs2 overlay
[    9.362661] overlayfs: upper fs does not support tmpfile.
[    9.388969] urandom-seed: Seeding with /etc/urandom.seed
[    9.485386] eth0: link down
[    9.505003] procd: - early -
[    9.508831] procd: - watchdog -
[   10.132120] procd: - watchdog -
[   10.135686] procd: - ubus -
[   10.196626] random: ubusd: uninitialized urandom read (4 bytes read)
[   10.204689] random: ubusd: uninitialized urandom read (4 bytes read)
[   10.212441] procd: - init -
[   11.165649] kmodloader: loading kernel modules from /etc/modules.d/*
[   11.200727] urngd: v1.0.2 started.
[   11.351813] usbcore: registered new interface driver usbfs
[   11.357601] usbcore: registered new interface driver hub
[   11.363181] usbcore: registered new device driver usb
[   11.425737] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[   11.448338] random: crng init done
[   11.575252] SCSI subsystem initialized
[   11.626447] ehci-platform: EHCI generic platform driver
[   11.719047] ip6_tables: (C) 2000-2006 Netfilter Core Team
[   11.740488] ehci-pci: EHCI PCI platform driver
[   11.766638] uhci_hcd: USB Universal Host Controller Interface driver
[   11.787990] Loading modules backported from Linux version v4.19.161-0-gdaefdc9eb24b
[   11.795948] Backport generated by backports.git v4.19.161-1-0-g4bb568fe
[   11.834828] ip_tables: (C) 2000-2006 Netfilter Core Team
[   11.851079] nf_conntrack version 0.5.0 (2048 buckets, 8192 max)
[   11.973964] usbcore: registered new interface driver usb-storage
[   12.026722] xt_time: kernel timezone is -0000
[   12.129656] PPP generic driver version 2.4.2
[   12.145975] NET: Registered protocol family 24
[   12.165574] usbcore: registered new interface driver uas
[   12.237904] ath10k 4.19 driver, optimized for CT firmware, probing pci device: 0x56.
[   12.255912] PCI: Enabling device 0000:00:00.0 (0000 -> 0002)
[   12.262060] ath10k_pci 0000:00:00.0: pci irq legacy oper_irq_mode 1 irq_mode 0 reset_mode 0
[   12.485802] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/fwcfg-pci-0000:00:00.0.txt failed with error -2
[   12.496717] ath10k_pci 0000:00:00.0: Falling back to user helper
[   12.838472] firmware ath10k!fwcfg-pci-0000:00:00.0.txt: firmware_loading_store: map pages failed
[   12.851533] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA9888/hw2.0/ct-firmware-5.bin failed with error -2
[   12.862899] ath10k_pci 0000:00:00.0: Falling back to user helper
[   13.042161] firmware ath10k!QCA9888!hw2.0!ct-firmware-5.bin: firmware_loading_store: map pages failed
[   13.052021] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA9888/hw2.0/ct-firmware-2.bin failed with error -2
[   13.063381] ath10k_pci 0000:00:00.0: Falling back to user helper
[   13.247981] firmware ath10k!QCA9888!hw2.0!ct-firmware-2.bin: firmware_loading_store: map pages failed
[   13.257811] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA9888/hw2.0/firmware-6.bin failed with error -2
[   13.268896] ath10k_pci 0000:00:00.0: Falling back to user helper
[   13.447916] firmware ath10k!QCA9888!hw2.0!firmware-6.bin: firmware_loading_store: map pages failed
[   14.040832] ath10k_pci 0000:00:00.0: qca9888 hw2.0 target 0x01000000 chip_id 0x00000000 sub 0000:0000
[   14.050399] ath10k_pci 0000:00:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[   14.070430] ath10k_pci 0000:00:00.0: firmware ver 10.4b-ct-9888-fW-13-8c5b2baa2 api 5 features mfp,peer-flow-ctrl,txstatus-noack,wmi-10.x-CT,ratemask-CT,regdump-CT,txrate-CT,flush-all-CT,pingpong-CT,ch-regs-CT,nop-CT,set-special-CT,tx-rc-CT,cust-stats-CT,txrate2-CT,beacon-cb-CT,wmi-block-ack-CT,wmi-bcn-rc-CT crc32 cbf49903
[   14.405997] ath10k_pci 0000:00:00.0: failed to fetch board data for bus=pci,bmi-chip-id=0,bmi-board-id=20 from ath10k/QCA9888/hw2.0/board-2.bin
[   14.420047] ath10k_pci 0000:00:00.0: board_file api 1 bmi_id 0:20 crc32 5180ee40
[   16.472589] ath10k_pci 0000:00:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
[   16.480370] ath10k_pci 0000:00:00.0: msdu-desc: 2500  skid: 32
[   16.510728] ath10k_pci 0000:00:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
[   16.522048] ath10k_pci 0000:00:00.0: wmi print 'free: 114572 iram: 12804 sram: 29508'
[   16.732079] ath10k_pci 0000:00:00.0: htt-ver 2.2 wmi-op 6 htt-op 4 cal pre-cal-file max-sta 32 raw 0 hwcrypto 1
[   16.847885] ath: EEPROM regdomain: 0x0
[   16.847892] ath: EEPROM indicates default country code should be used
[   16.847895] ath: doing EEPROM country->regdmn map search
[   16.847908] ath: country maps to regdmn code: 0x3a
[   16.847913] ath: Country alpha2 being used: US
[   16.847916] ath: Regpair used: 0x3a
[   16.918775] ath: EEPROM regdomain: 0x0
[   16.918783] ath: EEPROM indicates default country code should be used
[   16.918786] ath: doing EEPROM country->regdmn map search
[   16.918799] ath: country maps to regdmn code: 0x3a
[   16.918804] ath: Country alpha2 being used: US
[   16.918807] ath: Regpair used: 0x3a
[   16.931550] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[   16.933089] ieee80211 phy1: Atheros AR9561 Rev:0 mem=0xb8100000, irq=2
[   17.038563] kmodloader: done loading kernel modules from /etc/modules.d/*
[   27.441258] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   27.448757] eth0: link up (1000Mbps/Full duplex)
[   27.453550] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   27.482294] br-lan: port 1(eth0.1) entered blocking state
[   27.488056] br-lan: port 1(eth0.1) entered disabled state
[   27.493885] device eth0.1 entered promiscuous mode
[   27.498887] device eth0 entered promiscuous mode
[   27.565072] br-lan: port 1(eth0.1) entered blocking state
[   27.570656] br-lan: port 1(eth0.1) entered forwarding state
[   27.576595] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
[   27.817685] br-wan: port 1(eth0) entered blocking state
[   27.823094] br-wan: port 1(eth0) entered disabled state
[   27.846826] br-wan: port 1(eth0) entered blocking state
[   27.852233] br-wan: port 1(eth0) entered forwarding state
[   27.897969] br-wan: port 2(eth0.2) entered blocking state
[   27.903555] br-wan: port 2(eth0.2) entered disabled state
[   27.950686] device eth0.2 entered promiscuous mode
[   27.969950] br-wan: port 2(eth0.2) entered blocking state
[   27.975576] br-wan: port 2(eth0.2) entered forwarding state
[   28.515276] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[   33.232962] ath10k_pci 0000:00:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
[   33.240758] ath10k_pci 0000:00:00.0: msdu-desc: 2500  skid: 32
[   33.270898] ath10k_pci 0000:00:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
[   33.282221] ath10k_pci 0000:00:00.0: wmi print 'free: 114572 iram: 12804 sram: 29508'
[   33.570036] ath10k_pci 0000:00:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
[   33.581630] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   33.606288] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
[   33.644712] br-lan: port 2(wlan1) entered blocking state
[   33.650344] br-lan: port 2(wlan1) entered disabled state
[   33.656315] device wlan1 entered promiscuous mode
[   33.661265] br-lan: port 2(wlan1) entered blocking state
[   33.666815] br-lan: port 2(wlan1) entered forwarding state
[   33.677987] br-lan: port 3(wlan0) entered blocking state
[   33.683609] br-lan: port 3(wlan0) entered disabled state
[   33.689439] device wlan0 entered promiscuous mode
[   34.231286] ath10k_pci 0000:00:00.0: NOTE:  Firmware DBGLOG output disabled in debug_mask: 0x10000000
[   34.595009] br-lan: port 2(wlan1) entered disabled state
[   40.733435] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
[   40.740226] br-lan: port 2(wlan1) entered blocking state
[   40.745758] br-lan: port 2(wlan1) entered forwarding state
[   41.628088] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[   41.635031] br-lan: port 3(wlan0) entered blocking state
[   41.640549] br-lan: port 3(wlan0) entered forwarding state

@AndrewZ Yeah, I was afraid that it was going to be at least something like that, having to rebuild my own image with the USB support. I don't really know how to go about that, though.
I went through Beginners guide to building your own firmware and Quick Image Building Guide and I looked through menuconfig and kernel_menuconfig, trying to enable any options that sounded promising. I successfully built and loaded the firmware, but sadly it did not help.

Here's the list of options I enabled via make menuconfig, after selecting the Archer C6 v2 as target profile:

Kernel modules
	Filesystems
		kmod-fs-ext4
	USB support
		kmod-usb-core
		kmod-usb-storage
		kmod-usb-ohci
		kmod-usb-uhci
		kmod-usb2

and the same for make kernel_config:

Device Drivers
	SCSI device support
		SCSI device support
	USB support
		Support for Host-side USB
		USB announce new devices
		EHCI HCD (USB 2.0) support
			Root Hub Transaction Translators
			Improved Transaction Translator scheduling
			Generic EHCI driver for a platform device
		OHCI HCD (USB 1.1) support
			Generic OHCI driver for a platform device
		USB Mass Storage support
			USB Attached SCSI

Dmesg output is still nearly the same in that, apart from more drivers being registered, there's still no sign of any USB root hub being detected:

root@OpenWrt:~# dmesg | grep 'usb\|uhci\|ehci\|ohci'
[    0.172187] usbcore: registered new interface driver usbfs
[    0.178088] usbcore: registered new interface driver hub
[    0.183757] usbcore: registered new device driver usb
[    1.843181] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    1.849966] ehci-pci: EHCI PCI platform driver
[    1.854637] ehci-platform: EHCI generic platform driver
[    1.860147] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    1.866571] ohci-platform: OHCI generic platform driver
[    1.873484] usbcore: registered new interface driver uas
[    1.879103] usbcore: registered new interface driver usb-storage
[    3.995223] uhci_hcd: USB Universal Host Controller Interface driver

and lsusb is still giving the same error:

root@OpenWrt:~# lsusb
unable to initialize libusb: -99

I am not sure how to go about comparing differences in configuration between the C6 and C7, or where any other configuration needs to be changed and how.
Needless to say, I am not fond of risking bricking the router by flashing C7 firmware. Though, I do have a JTAG probe in case everything else fails - let's call that "plan-Z".

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My understanding that you first need to make the modification(s) in the DTS for your device, e.g. in

USB components are disabled in the top-level .dtsi that is included in this file and you need to enable them in the individual .dts file for your device.
You can probably take this .dts file as an example.

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Thank you very much, that did the trick!
I simply appended

&usb_phy0 {
	status = "okay";
};

&usb0 {
	#address-cells = <1>;
	#size-cells = <0>;
	status = "okay";

	hub_port0: port@1 {
		reg = <1>;
		#trigger-source-cells = <0>;
	};
};

to the file target/linux/ath79/dts/qca9563_tplink_archer-c6-v2.dts and then the USB root hub showed up in dmesg, as well as info about plugging and unplugging devices.

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