I managed to access the serial port. Here's the bootlog:
U-Boot 1.1.4--LSDK-10.2-00082-4 (Jul 3 2018 - 16:11:24)
board956x - Dragonfly 1.0DRAM:
sri
ath_ddr_initial_config(287): (ddr2 init)
ath_ddr_initial_config: DDR_EMR2_ADDRESS=0x180000bc, EMR2 value=0x80
ath_sys_frequency: ref_clk 25000000
ath_sys_frequency: cpu 775 ddr 650 ahb 258
Tap values = (0x11, 0x11, 0x11, 0x11)
128 MB
Top of RAM usable for U-Boot at: 88000000
Reserving 165k for U-Boot at: 87fd4000
Reserving 192k for malloc() at: 87fa4000
Reserving 44 Bytes for Board Info at: 87fa3fd4
Reserving 36 Bytes for Global Data at: 87fa3fb0
Reserving 128k for boot params() at: 87f83fb0
Stack Pointer at: 87f83f98
Now running in RAM - U-Boot at: 87fd4000
Flash Manuf Id 0x1c, DeviceId0 0x70, DeviceId1 0x18
flash size 16MB, sector count = 256
Flash: 16 MB
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Setting 0x181162c0 to 0x50a02100
Hit Ctrl+B to stop autoboot: 2 1 0
Loading .text @ 0x80060000 (2039254 bytes)
## Starting application at 0x80060000 ...
OpenWrt kernel loader for AR7XXX/AR9XXX
Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
Decompressing kernel... done!
Starting kernel at 80060000...
[ 0.000000] Linux version 5.4.111 (builder@buildhost) (gcc version 8.4.0 (OpenWrt GCC 8.4.0 r16046-59980f7aaf)) #0 Sun Apr 18 10:06:57 2021
[ 0.000000] printk: bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 00019750 (MIPS 74Kc)
[ 0.000000] MIPS: machine is TP-Link EAP225-Outdoor v1
[ 0.000000] SoC: Qualcomm Atheros QCA956X ver 1 rev 0
[ 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] Built 1 zonelists, mobility grouping on. Total pages: 32480
[ 0.000000] Kernel command line: console=ttyS0,115200n8 rootfstype=squashfs,jffs2
[ 0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
[ 0.000000] Writing ErrCtl register=00000000
[ 0.000000] Readback ErrCtl register=00000000
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Memory: 122248K/131072K available (5216K kernel code, 190K rwdata, 684K rodata, 1196K init, 205K bss, 8824K 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] random: get_random_bytes called from 0x80655984 with crng_init=0
[ 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
[ 0.008232] Calibrating delay loop... 385.02 BogoMIPS (lpj=770048)
[ 0.046713] pid_max: default: 32768 minimum: 301
[ 0.051716] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.059422] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.071449] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[ 0.081768] futex hash table entries: 256 (order: -1, 3072 bytes, linear)
[ 0.089049] pinctrl core: initialized pinctrl subsystem
[ 0.096908] NET: Registered protocol family 16
[ 0.124018] workqueue: max_active 576 requested for napi_workq is out of range, clamping between 1 and 512
[ 0.137557] clocksource: Switched to clocksource MIPS
[ 0.144051] NET: Registered protocol family 2
[ 0.149520] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes, linear)
[ 0.158405] TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.166498] TCP bind hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.173940] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.180777] UDP hash table entries: 256 (order: 0, 4096 bytes, linear)
[ 0.187719] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes, linear)
[ 0.195377] NET: Registered protocol family 1
[ 0.200029] PCI: CLS 0 bytes, default 32
[ 0.207740] workingset: timestamp_bits=14 max_order=15 bucket_order=1
[ 0.220878] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.227068] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.250144] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251)
[ 0.261378] pinctrl-single 1804002c.pinmux: 544 pins, size 68
[ 0.268477] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[ 0.277361] printk: console [ttyS0] disabled
[ 0.281958] 18020000.uart: ttyS0 at MMIO 0x18020000 (irq = 9, base_baud = 1562500) is a 16550A
[ 0.291070] printk: console [ttyS0] enabled
[ 0.291070] printk: console [ttyS0] enabled
[ 0.300132] printk: bootconsole [early0] disabled
[ 0.300132] printk: bootconsole [early0] disabled
[ 0.319234] spi-nor spi0.0: en25qh128 (16384 Kbytes)
[ 0.324475] 7 fixed-partitions partitions found on MTD device spi0.0
[ 0.331049] Creating 7 MTD partitions on "spi0.0":
[ 0.336026] 0x000000000000-0x000000020000 : "u-boot"
[ 0.342097] 0x000000020000-0x000000030000 : "partition-table"
[ 0.348913] 0x000000030000-0x000000040000 : "info"
[ 0.354747] 0x000000040000-0x000000dc0000 : "firmware"
[ 0.364877] 2 elf-loader-fw partitions found on MTD device firmware
[ 0.371407] Creating 2 MTD partitions on "firmware":
[ 0.376554] 0x000000000000-0x000000200000 : "kernel"
[ 0.382544] 0x000000200000-0x000000d80000 : "rootfs"
[ 0.388524] mtd: device 5 (rootfs) set to be root filesystem
[ 0.396087] 1 squashfs-split partitions found on MTD device rootfs
[ 0.402540] 0x0000005a0000-0x000000d80000 : "rootfs_data"
[ 0.408995] 0x000000dc0000-0x000000df0000 : "config"
[ 0.415028] 0x000000f30000-0x000000ff0000 : "log"
[ 0.420812] 0x000000ff0000-0x000001000000 : "art"
[ 0.428368] libphy: Fixed MDIO Bus: probed
[ 1.165549] random: fast init done
[ 1.385930] libphy: ag71xx_mdio: probed
[ 1.392016] ag71xx 19000000.eth: connected to PHY at mdio.0:04 [uid=004dd074, driver=Atheros 8031 ethernet]
[ 1.402673] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode: sgmii
[ 1.409405] i2c /dev entries driver
[ 1.415087] NET: Registered protocol family 10
[ 1.424755] Segment Routing with IPv6
[ 1.428694] NET: Registered protocol family 17
[ 1.433392] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 1.446783] 8021q: 802.1Q VLAN Support v1.8
[ 1.451952] PCI host bridge /ahb/pcie-controller@18250000 ranges:
[ 1.458322] MEM 0x0000000012000000..0x0000000013ffffff
[ 1.463727] IO 0x0000000000000000..0x0000000000000000
[ 1.469291] PCI host bridge to bus 0000:00
[ 1.473572] pci_bus 0000:00: root bus resource [mem 0x12000000-0x13ffffff]
[ 1.480675] pci_bus 0000:00: root bus resource [io 0x0000]
[ 1.486443] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[ 1.493459] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[ 1.501684] pci 0000:00:00.0: [168c:0056] type 00 class 0x028000
[ 1.507949] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x001fffff 64bit]
[ 1.515090] pci 0000:00:00.0: PME# supported from D0 D3hot
[ 1.521766] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
[ 1.528628] pci 0000:00:00.0: BAR 0: assigned [mem 0x12000000-0x121fffff 64bit]
[ 1.537090] hctosys: unable to open rtc device (rtc0)
[ 1.547847] VFS: Mounted root (squashfs filesystem) readonly on device 31:5.
[ 1.561901] Freeing unused kernel memory: 1196K
[ 1.566604] This architecture does not have kernel memory protection.
[ 1.573253] Run /sbin/init as init process
[ 2.183362] init: Console is alive
[ 2.187188] init: - watchdog -
[ 3.277796] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 3.435985] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 3.454273] init: - preinit -
[ 4.349250] random: jshn: uninitialized urandom read (4 bytes read)
[ 4.461524] random: jshn: uninitialized urandom read (4 bytes read)
[ 4.493884] random: jshn: uninitialized urandom read (4 bytes read)
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
[ 8.934101] jffs2: notice: (543) jffs2_build_xattr_subsystem: complete building xattr subsystem, 161 of xdatum (10 unchecked, 147 orphan) and 214 of xref (15 dead, 179 orphan) found.
[ 8.952537] mount_root: switching to jffs2 overlay
[ 8.963341] overlayfs: upper fs does not support tmpfile.
[ 8.974721] urandom-seed: Seeding with /etc/urandom.seed
[ 9.075000] procd: - early -
[ 9.078132] procd: - watchdog -
[ 9.707742] procd: - watchdog -
[ 9.795185] procd: - ubus -
[ 9.897737] urandom_read: 5 callbacks suppressed
[ 9.897745] random: ubusd: uninitialized urandom read (4 bytes read)
[ 9.949009] random: ubusd: uninitialized urandom read (4 bytes read)
[ 9.958933] procd: - init -
Please press Enter to activate this console.
[ 10.786982] kmodloader: loading kernel modules from /etc/modules.d/*
[ 10.991007] Loading modules backported from Linux version v5.10.16-0-gde53befa79cf
[ 10.998884] Backport generated by backports.git v5.10.16-1-0-g21d2a1d2
[ 11.056778] xt_time: kernel timezone is -0000
[ 11.075813] urngd: v1.0.2 started.
[ 11.207392] PPP generic driver version 2.4.2
[ 11.222312] NET: Registered protocol family 24
[ 11.300700] ath10k 5.10 driver, optimized for CT firmware, probing pci device: 0x56.
[ 11.322543] ath10k_pci 0000:00:00.0: enabling device (0000 -> 0002)
[ 11.329342] ath10k_pci 0000:00:00.0: pci irq legacy oper_irq_mode 1 irq_mode 0 reset_mode 0
[ 11.349234] random: crng init done
[ 13.940606] ath10k_pci 0000:00:00.0: qca9888 hw2.0 target 0x01000000 chip_id 0x00000000 sub 0000:0000
[ 13.950176] ath10k_pci 0000:00:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[ 13.970233] ath10k_pci 0000:00:00.0: firmware ver 10.4b-ct-9888-fW-13-5ae337bb1 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 59e741e7
[ 14.307239] ath10k_pci 0000:00:00.0: board_file api 2 bmi_id 0:24 crc32 f228337a
[ 16.067630] ath10k_pci 0000:00:00.0: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
[ 16.075402] ath10k_pci 0000:00:00.0: msdu-desc: 2500 skid: 32
[ 16.125590] 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'
[ 16.136896] ath10k_pci 0000:00:00.0: wmi print 'free: 114572 iram: 12644 sram: 29508'
[ 16.373156] 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
[ 16.553434] ieee80211 phy1: Atheros AR9561 Rev:0 mem=0xb8100000, irq=2
[ 16.628211] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 28.799987] br-lan: port 1(eth0) entered blocking state
[ 28.805456] br-lan: port 1(eth0) entered disabled state
[ 28.811155] device eth0 entered promiscuous mode
There seems to be a few errors. Any comments, feedback, suggestions are greatly appreciated!