I'm using the RBM33G board and I'm needing to expand its memory. I see it has a microSD slot on the back. Yet, I've not been able to find any documentation on how to leverage it.
Anyone have any experience with using the microSD slot as part of the root file system?
Read the wiki about extroot and check in dmesg if the sd card is successfully detected when you insert it. If not, maybe some kernel modules need to be installed.
Thanks @trendy I've followed that one and many others to no avail...
The only documentation MikroTik provides:
[ 0.000000] Linux version 4.14.63 (buildbot@builds-03.infra.lede-project.org) (gcc version 7.3.0 (OpenWrt GCC 7.3.0 r7102-3f3a2c9)) #0 SMP Thu Aug 16 07:51:15 2018
[ 0.000000] SoC Type: MediaTek MT7621 ver:1 eco:3
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 0001992f (MIPS 1004Kc)
[ 0.000000] MIPS: machine is MikroTik RBM33G
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 10000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] VPE topology {2,2} total 4
[ 0.000000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.000000] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000000000000-0x000000000fffffff]
[ 0.000000] HighMem empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x000000000fffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x000000000fffffff]
[ 0.000000] On node 0 totalpages: 65536
[ 0.000000] free_area_init_node: node 0, pgdat 80545e80, node_mem_map 81003000
[ 0.000000] Normal zone: 512 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 65536 pages, LIFO batch:15
[ 0.000000] random: get_random_bytes called from 0x80549740 with crng_init=0
[ 0.000000] percpu: Embedded 14 pages/cpu @8120f000 s26256 r8192 d22896 u57344
[ 0.000000] pcpu-alloc: s26256 r8192 d22896 u57344 alloc=14*4096
[ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 65024
[ 0.000000] Kernel command line: console=ttyS0,115200 rootfstype=squashfs,jffs2
[ 0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
[ 0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
[ 0.000000] Writing ErrCtl register=00014112
[ 0.000000] Readback ErrCtl register=00014112
[ 0.000000] Memory: 253668K/262144K available (4596K kernel code, 239K rwdata, 564K rodata, 220K init, 270K bss, 8476K reserved, 0K cma-reserved, 0K highmem)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] NR_IRQS: 256
[ 0.000000] clocksource: GIC: mask: 0xffffffffffffffff max_cycles: 0xcaf478abb4, max_idle_ns: 440795247997 ns
[ 0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 4343773742 ns
[ 0.000010] sched_clock: 32 bits at 440MHz, resolution 2ns, wraps every 4880645118ns
[ 0.007802] Calibrating delay loop... 586.13 BogoMIPS (lpj=2930688)
[ 0.073961] pid_max: default: 32768 minimum: 301
[ 0.078716] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.085224] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.093893] Hierarchical SRCU implementation.
[ 0.098956] smp: Bringing up secondary CPUs ...
[ 7.154367] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 7.154377] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 7.154388] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 7.154516] CPU1 revision is: 0001992f (MIPS 1004Kc)
[ 0.163654] Synchronize counters for CPU 1: done.
[ 6.710798] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 6.710807] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 6.710816] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 6.710884] CPU2 revision is: 0001992f (MIPS 1004Kc)
[ 0.254456] Synchronize counters for CPU 2: done.
[ 3.389916] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 3.389924] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 3.389932] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 3.390009] CPU3 revision is: 0001992f (MIPS 1004Kc)
[ 0.339632] Synchronize counters for CPU 3: done.
[ 0.369491] smp: Brought up 1 node, 4 CPUs
[ 0.377032] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.386808] futex hash table entries: 1024 (order: 3, 32768 bytes)
[ 0.393097] pinctrl core: initialized pinctrl subsystem
[ 0.398891] NET: Registered protocol family 16
[ 0.410208] Can't analyze schedule() prologue at 80478bc4
[ 0.415563] FPU Affinity set after 11720 emulations
[ 0.416263] pull PCIe RST: RALINK_RSTCTRL = 0
[ 0.720963] release PCIe RST: RALINK_RSTCTRL = 7000000
[ 0.725995] ***** Xtal 40MHz *****
[ 0.729369] release PCIe RST: RALINK_RSTCTRL = 7000000
[ 0.734476] Port 0 N_FTS = 1b102800
[ 0.737918] Port 1 N_FTS = 1b102800
[ 0.741377] Port 2 N_FTS = 1b102800
[ 1.896438] PCIE0 no card, disable it(RST&CLK)
[ 1.900787] PCIE2 no card, disable it(RST&CLK)
[ 1.905191] -> 20107f2
[ 1.907625] PCIE1 enabled
[ 1.910207] PCI host bridge /pcie@1e140000 ranges:
[ 1.914971] MEM 0x0000000060000000..0x000000006fffffff
[ 1.920156] IO 0x000000001e160000..0x000000001e16ffff
[ 1.925328] PCI coherence region base: 0xbfbf8000, mask/settings: 0x60000000
[ 1.940786] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 1.946603] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 1.952329] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 1.959179] i2c-mt7621 1e000900.i2c: clock 100KHz, re-start not support
[ 1.966219] PCI host bridge to bus 0000:00
[ 1.970270] pci_bus 0000:00: root bus resource [mem 0x60000000-0x6fffffff]
[ 1.977052] pci_bus 0000:00: root bus resource [io 0xffffffff]
[ 1.982947] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[ 1.989665] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[ 1.997581] pci 0000:00:00.0: [0e8d:0801] type 01 class 0x060400
[ 1.997619] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x7fffffff]
[ 1.997630] pci 0000:00:00.0: reg 0x14: [mem 0x00000000-0x0000ffff]
[ 1.997692] pci 0000:00:00.0: supports D1
[ 1.997701] pci 0000:00:00.0: PME# supported from D0 D1 D3hot
[ 1.997949] pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[ 2.006023] pci 0000:01:00.0: [168c:0033] type 00 class 0x028000
[ 2.006075] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x0001ffff 64bit]
[ 2.006116] pci 0000:01:00.0: reg 0x30: [mem 0x00000000-0x0000ffff pref]
[ 2.006202] pci 0000:01:00.0: supports D1
[ 2.006211] pci 0000:01:00.0: PME# supported from D0 D1 D3hot
[ 2.006372] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01
[ 2.006394] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 01
[ 2.006452] pci 0000:00:00.0: BAR 0: no space for [mem size 0x80000000]
[ 2.012979] pci 0000:00:00.0: BAR 0: failed to assign [mem size 0x80000000]
[ 2.019875] pci 0000:00:00.0: BAR 8: assigned [mem 0x60000000-0x600fffff]
[ 2.026634] pci 0000:00:00.0: BAR 9: assigned [mem 0x60100000-0x601fffff pref]
[ 2.033788] pci 0000:00:00.0: BAR 1: assigned [mem 0x60200000-0x6020ffff]
[ 2.040552] pci 0000:01:00.0: BAR 0: assigned [mem 0x60000000-0x6001ffff 64bit]
[ 2.047796] pci 0000:01:00.0: BAR 6: assigned [mem 0x60100000-0x6010ffff pref]
[ 2.054966] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 2.059877] pci 0000:00:00.0: bridge window [mem 0x60000000-0x600fffff]
[ 2.066634] pci 0000:00:00.0: bridge window [mem 0x60100000-0x601fffff pref]
[ 2.075024] clocksource: Switched to clocksource GIC
[ 2.081573] NET: Registered protocol family 2
[ 2.086658] TCP established hash table entries: 2048 (order: 1, 8192 bytes)
[ 2.093544] TCP bind hash table entries: 2048 (order: 2, 16384 bytes)
[ 2.099966] TCP: Hash tables configured (established 2048 bind 2048)
[ 2.106363] UDP hash table entries: 256 (order: 1, 8192 bytes)
[ 2.112128] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[ 2.118598] NET: Registered protocol family 1
[ 2.122905] PCI: CLS 0 bytes, default 32
[ 2.354972] 4 CPUs re-calibrate udelay(lpj = 2924544)
[ 2.361378] Crashlog allocated RAM at address 0x3f00000
[ 2.366726] workingset: timestamp_bits=30 max_order=16 bucket_order=0
[ 2.375114] random: fast init done
[ 2.383375] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 2.389191] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 2.402387] io scheduler noop registered
[ 2.406267] io scheduler deadline registered (default)
[ 2.412513] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[ 2.422309] console [ttyS0] disabled
[ 2.425905] 1e000c00.uartlite: ttyS0 at MMIO 0x1e000c00 (irq = 18, base_baud = 3125000) is a 16550A
[ 2.434860] console [ttyS0] enabled
[ 2.441765] bootconsole [early0] disabled
[ 2.450616] cacheinfo: Failed to find cpu0 device node
[ 2.455786] cacheinfo: Unable to detect cache hierarchy for CPU 0
[ 2.462642] MediaTek Nand driver init, version v2.1 Fix AHB virt2phys error
[ 2.470026] spi-mt7621 1e000b00.spi: sys_freq: 50000000
[ 2.486569] m25p80 spi0.0: w25x40 (512 Kbytes)
[ 2.491034] 2 fixed-partitions partitions found on MTD device spi0.0
[ 2.497373] Creating 2 MTD partitions on "spi0.0":
[ 2.502149] 0x000000000000-0x00000000f000 : "routerboot"
[ 2.508564] 0x00000000f000-0x000000080000 : "factory"
[ 2.525240] m25p80 spi0.1: w25q128 (16384 Kbytes)
[ 2.529957] 1 fixed-partitions partitions found on MTD device spi0.1
[ 2.536308] Creating 1 MTD partitions on "spi0.1":
[ 2.541084] 0x000000040000-0x000001000000 : "firmware"
[ 2.637526] 2 minor-fw partitions found on MTD device firmware
[ 2.643354] 0x000000040000-0x000000210000 : "kernel"
[ 2.649323] 0x000000210000-0x000001000000 : "rootfs"
[ 2.655213] mtd: device 4 (rootfs) set to be root filesystem
[ 2.660980] 1 squashfs-split partitions found on MTD device rootfs
[ 2.667164] 0x0000003d0000-0x000001000000 : "rootfs_data"
[ 2.674182] libphy: Fixed MDIO Bus: probed
[ 2.747024] libphy: mdio: probed
[ 4.149795] mtk_soc_eth 1e100000.ethernet: loaded mt7530 driver
[ 4.156365] mtk_soc_eth 1e100000.ethernet eth0: mediatek frame engine at 0xbe100000, irq 21
[ 4.166930] NET: Registered protocol family 10
[ 4.172826] Segment Routing with IPv6
[ 4.176598] NET: Registered protocol family 17
[ 4.181086] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 4.193993] 8021q: 802.1Q VLAN Support v1.8
[ 4.200506] hctosys: unable to open rtc device (rtc0)
[ 4.214233] VFS: Mounted root (squashfs filesystem) readonly on device 31:4.
[ 4.221770] Freeing unused kernel memory: 220K
[ 4.226244] This architecture does not have kernel memory protection.
[ 4.670866] random: crng init done
[ 5.093247] init: Console is alive
[ 5.096899] init: - watchdog -
[ 5.593192] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 5.709184] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up
[ 5.758676] usbcore: registered new interface driver usbfs
[ 5.764240] usbcore: registered new interface driver hub
[ 5.769714] usbcore: registered new device driver usb
[ 5.783175] xhci-mtk 1e1c0000.xhci: xHCI Host Controller
[ 5.788536] xhci-mtk 1e1c0000.xhci: new USB bus registered, assigned bus number 1
[ 5.805200] xhci-mtk 1e1c0000.xhci: hcc params 0x01401198 hci version 0x96 quirks 0x00210010
[ 5.813673] xhci-mtk 1e1c0000.xhci: irq 20, io mem 0x1e1c0000
[ 5.820354] hub 1-0:1.0: USB hub found
[ 5.824171] hub 1-0:1.0: 2 ports detected
[ 5.828763] xhci-mtk 1e1c0000.xhci: xHCI Host Controller
[ 5.834080] xhci-mtk 1e1c0000.xhci: new USB bus registered, assigned bus number 2
[ 5.841572] xhci-mtk 1e1c0000.xhci: Host supports USB 3.0 SuperSpeed
[ 5.848181] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
[ 5.857102] hub 2-0:1.0: USB hub found
[ 5.860914] hub 2-0:1.0: 1 port detected
[ 5.867184] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 5.875365] init: - preinit -
[ 6.211947] mtk_soc_eth 1e100000.ethernet eth0: port 1 link up
[ 6.721167] mtk_soc_eth 1e100000.ethernet: PPE started
[ 10.310853] jffs2: notice: (462) jffs2_build_xattr_subsystem: complete building xattr subsystem, 6 of xdatum (3 unchecked, 3 orphan) and 72 of xref (4 dead, 0 orphan) found.
[ 10.350589] mount_root: loading kmods from internal overlay
[ 12.235907] kmodloader: loading kernel modules from /tmp/overlay/upper/etc/modules-boot.d/*
[ 13.011146] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 13.109469] SCSI subsystem initialized
[ 13.142228] ehci-platform: EHCI generic platform driver
[ 13.148936] ehci-pci: EHCI PCI platform driver
[ 13.173911] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 13.181155] ohci-platform: OHCI generic platform driver
[ 13.188761] ohci-pci: OHCI PCI platform driver
[ 13.224031] usbcore: registered new interface driver usb-storage
[ 13.237391] usbcore: registered new interface driver uas
[ 13.242954] kmodloader: done loading kernel modules from /tmp/overlay/upper/etc/modules-boot.d/*
[ 13.626373] block: attempting to load /tmp/jffs_cfg/upper/etc/config/fstab
[ 13.635989] block: extroot: not configured
[ 13.689722] mount_root: switching to jffs2 overlay
[ 13.783432] overlayfs: upper fs does not support tmpfile.
[ 13.793391] urandom-seed: Seeding with /etc/urandom.seed
[ 14.158786] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x6060000c, 0x10c = 0x80818
[ 14.173230] procd: - early -
[ 14.176243] procd: - watchdog -
[ 14.835186] procd: - watchdog -
[ 14.838627] procd: - ubus -
[ 14.971692] procd: - init -
[ 16.170542] kmodloader: loading kernel modules from /etc/modules.d/*
[ 16.196129] ip6_tables: (C) 2000-2006 Netfilter Core Team
[ 16.666019] u32 classifier
[ 16.668732] input device check on
[ 16.672374] Actions configured
[ 16.677258] Mirror/redirect action on
[ 16.687897] nf_conntrack version 0.5.0 (4096 buckets, 16384 max)
[ 16.718550] Loading modules backported from Linux version wt-2017-11-01-0-gfe248fc2c180
[ 16.726568] Backport generated by backports.git v4.14-rc2-1-31-g86cf0e5d
[ 16.735258] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 17.415541] wireguard: WireGuard 0.0.20180718 loaded. See www.wireguard.com for information.
[ 17.423961] wireguard: Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
[ 17.454415] xt_time: kernel timezone is -0000
[ 18.265862] PPP generic driver version 2.4.2
[ 18.271464] NET: Registered protocol family 24
[ 18.586334] bus=0x1, slot = 0x0, irq=0xff
[ 18.590374] PCI: Enabling device 0000:00:00.0 (0004 -> 0006)
[ 18.603072] ath: EEPROM regdomain: 0x0
[ 18.603080] ath: EEPROM indicates default country code should be used
[ 18.603084] ath: doing EEPROM country->regdmn map search
[ 18.603096] ath: country maps to regdmn code: 0x3a
[ 18.603102] ath: Country alpha2 being used: US
[ 18.603106] ath: Regpair used: 0x3a
[ 18.612043] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[ 18.616604] ieee80211 phy0: Atheros AR9300 Rev:4 mem=0xc10c0000, irq=24
[ 18.624258] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 25.851176] mtk_soc_eth 1e100000.ethernet: PPE started
[ 25.860739] device eth0 entered promiscuous mode
[ 25.867722] br-lan: port 1(eth0.1) entered blocking state
[ 25.873156] br-lan: port 1(eth0.1) entered disabled state
[ 25.879229] device eth0.1 entered promiscuous mode
[ 25.887576] br-lan: port 1(eth0.1) entered blocking state
[ 25.893016] br-lan: port 1(eth0.1) entered forwarding state
[ 25.899287] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
[ 26.915481] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[ 28.456876] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 28.480640] br-lan: port 2(wlan0) entered blocking state
[ 28.486035] br-lan: port 2(wlan0) entered disabled state
[ 28.492030] device wlan0 entered promiscuous mode
[ 35.831733] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 35.838458] br-lan: port 2(wlan0) entered blocking state
[ 35.843757] br-lan: port 2(wlan0) entered forwarding state
root@soho:~# lsusb -t <this is internal flash I think, because the two microSD cards I've been trying in all different types of formats one is 32G the other is 10G.
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci-mtk/1p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci-mtk/2p, 480M
root@soho:/dev# ls -al /dev/sd*
ls: /dev/sd*: No such file or directory
root@soho:/dev# ls -al /dev/bus/usb/00*
/dev/bus/usb/001:
drwxr-xr-x 2 root root 60 Dec 31 1969 .
drwxr-xr-x 4 root root 80 Dec 31 1969 ..
crw------- 1 root root 189, 0 Dec 31 1969 001
/dev/bus/usb/002:
drwxr-xr-x 2 root root 60 Dec 31 1969 .
drwxr-xr-x 4 root root 80 Dec 31 1969 ..
crw------- 1 root root 189, 128 Dec 31 1969 001
root@soho:/dev# opkg list-installed
kmod-fs-ext4 - 4.14.63-1
kmod-fs-f2fs - 4.14.63-1
kmod-usb-core - 4.14.63-1
kmod-usb-ehci - 4.14.63-1
kmod-usb-ohci - 4.14.63-1
kmod-usb-ohci-pci - 4.14.63-1
kmod-usb-storage - 4.14.63-1
kmod-usb-storage-uas - 4.14.63-1
kmod-usb2 - 4.14.63-1
kmod-usb2-pci - 4.14.63-1
kmod-usb3 - 4.14.63-1
libusb-1.0 - 1.0.22-1
usbutils - 007-9
block-mount - 2018-04-16-e2436836-1
Can you try with installing kmod-sdhci?
Only have 432.00 KB space left, the whole reason I'm trying to add the card 
I'll see what I can remove to free up space for both of these:
kmod-sdhci 4.14.63-1 20596 Kernel support for SDHCI Hosts
kmod-sdhci-mt7620 4.14.63-1 13571 MT7620 SDCI
Do you really need that?
kmod-usb-storage-uas - 4.9.152-1 - Say Y here if you want to include support for
USB Attached SCSI (UAS/UASP), a higher
performance protocol available on many
newer USB 3.0 storage devices
Start from scratch (factory defaults), installing only the absolutely necessary packages to setup up the SD card. After you get it up and running you can install there everything else you have.
Think this is progress!
[ 12.229893] mmc0: new high speed SDHC card at address aaaa
[ 12.236317] mmcblk0: mmc0:aaaa SL16G 14.8 GiB
[ 12.242523] mmcblk0: p1
lsusb -t still shows nothing, however I don't think the microSD slot using USB. Not sure where to look for the drive, going cross-eyed been at the this all night 
Thanks @trendy!
AHH!!
root@soho:~# ls -al /dev/mm*
brw------- 1 root root 179, 0 Dec 31 1969 /dev/mmcblk0
brw------- 1 root root 179, 1 Dec 31 1969 /dev/mmcblk0p1
Looks like you are good to go!
For future reference add here the modules that made it work.
If your problem is solved, feel free to mark the relevant post as the solution; and edit the title to add "[SOLVED]" to the beginning (click the pencil behind the topic).
root@soho:~# block info
/dev/mtdblock4: UUID="c3452e7b-87da92ff-de404cf4-5cef8e6b" VERSION="4.0" MOUNT="/rom" TYPE="squashfs"
/dev/mtdblock5: MOUNT="/overlay" TYPE="jffs2"
/dev/mmcblk0: UUID="95a6d576-d441-4dd4-bbb3-ba455091c0bb" VERSION="1.0" TYPE="ext3"
/dev/mmcblk0p1: UUID="8cecc322-bf5b-46db-a90a-cba207625fb8" VERSION="1.0" TYPE="ext3"
There are two mount points? I'm assuming p1 is partition one. I recall reading the jffs is the best format for extroot. Agree?
mmcblk0p1 is the one you will use.
F2FS is recommended for flash type of storages, the alternative would be ext4.
Post once more the packages that you had to install to make it work for future reference!
Actually I just flashed and started over again, it turns out all I needed was
kmod-sdhci-mt7620 4.14.63-1 13571 MT7620 SDCI
Not kmod-sdhci 4.14.63-1 20596 Kernel support for SDHCI Hosts
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