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OpenWRT overlay expansion via extroot

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Nyxeria

I am trying to get a router to expand it's overlay area so that I can install some tools on it. The router is running OpenWRT 19.07.7, and I tried following these instructions:

https://openwrt.org/docs/guide-user/additional-software/extroot_configuration

I tried overlaying sda3 as the overlay, as it has enough memory to do almost anything:

root@OpenWrt:~# lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
loop0    7:0    0 253.1M  0 loop /overlay
sda      8:0    0  14.9G  0 disk
├─sda1   8:1    0    16M  0 part /boot
├─sda2   8:2    0   256M  0 part /rom
└─sda3   8:3    0  14.7G  0 part

fstab (the uuid are correct for devices):

config 'global'
        option  anon_swap       '0'
        option  anon_mount      '0'
        option  auto_swap       '1'
        option  auto_mount      '1'
        option  delay_root      '5'
        option  check_fs        '0'

config 'mount'
        option  target  '/rwm'
        option  uuid    '2166d8f9-92c2-4274-8c97-db99c4537b57'
        option  enabled '1'

config 'mount'
        option  target  '/overlay'
        option  uuid    'de74071d-d46f-4a2b-8ee7-20d622ca4ec5'
        option  enabled '1'

config 'mount'
        option  target  '/boot'
        option  uuid    '57f8f4bc-abf4-655f-bf67-946fc0f9f25b'
        option  enabled '1'

config 'mount'
        option  target  '/rom'
        option  uuid    '7f504439-7de5488c-faf39c35-2868463c'
        option  enabled '1'

and the resulting df:

root@OpenWrt:~# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/root                 3072      3072         0 100% /rom
tmpfs                   958876        64    958812   0% /tmp
/dev/loop0              257152     17848    167624  10% /overlay
overlayfs:/overlay      257152     17848    167624  10% /
/dev/sda1                16112      5564     10224  35% /boot
/dev/sda1                16112      5564     10224  35% /boot
tmpfs                      512         0       512   0% /dev

I have also tried some of the troubleshooting steps outlined in the guide, like increasing time etc. But I am still unable to get a bigger overlay to happen. What am I doing wrong?

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bbbaasaffdas
I also encountered the same problem. Did you find a solution?
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