Data loss issue (and solution) for MTK uSD driver

[Rosen Penev]

On Fri, Apr 2, 2021 at 4:22 PM Enrico Mioso <mrkiko.rs at gmail.com> wrote:
>
> Hello all!!
>
> I experienced an issue that could cause data loss on a uSD card when used in some ramips MT7621 devices, like the Zbtlink ZBT-WG3526 (32M).
> I fixed it by following the nice solution pointed our here:
> https://forum.openwrt.org/t/a-lot-of-errors-with-sd-card-reader-mikrotik-rbm33g/36760
>
> I would like to say thanks to the author.
>
> Is there something we can do to fix this in a general way?
The MMC driver used in OpenWrt is not the upstream one. I've been
pushing to switch to the latter but some devices have pinctrl issues
it seems.
> The issue is important enough, given the fact that just mounting, creating a folder and umounting the device is enough to get e2fsck screaming at you! :)
> The same card seems to work fine on a GB-PC1. I am experiencing this issue with OpenWRt snapshot (commit ec6293febc244d187e71a6e54f44920be679cde4), running 5.4 kernel.
>
> I seen the FS get corrupted several times. BTW, has this the potential to damage the card itself?
No.
>
> Thanks!!
>
> Enrico
>
>
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