[OpenWrt-Devel] Random data on rootfs_data for tp-wr2543nd-v1 only with ath79

[Luiz Angelo Daros de Luca]

Hello,

I isolated the problem to be kernel upgrade from 4.14 to 4.19. If I build
ath79 with 4.14, it simply works.
The mtd problem also happens while booting 4.19 without touching the flash
4.19 (using initram image).

Is there a mechanism to do a kernel bisect in OpenWrt?
Or does anybody have any clue of what could have caused this?

Regards,
---
     Luiz Angelo Daros de Luca
            luizluca at gmail.com


Em sex., 31 de jan. de 2020 às 03:53, Luiz Angelo Daros de Luca <
luizluca at gmail.com> escreveu:

> Hello,
>
> I'm trying to debug
> https://bugs.openwrt.org/index.php?do=details&task_id=2742.
> So far, what I discovered:
>
> 1) it happens only in master, 19.07 is fine on both ath79 and ar71xx
> 2) it happens only in ath79. ar71xx is fine in master
> 3) rootfs_data (mtd4) contents keeps changing on each read. Each time I
> run: "dd if=/dev/mtd4 | md5sum - " I get a different hash.
> 4) I get the random data reading flash from firmware (mtd1), rootfs (mtd3)
> or rootfs_data(mtd4), but always around the region where rootfs_data is
> (after squashfs). I could not identify the exactly upper and lower
> boundaries where it happens (addresses are random).
> 5) I also happens without mounting jffs2 (failsafe)
> 6) Most mtd4 is 0xff (as expected). Only sparse bytes or sequence of bytes
> contains other values.
> 7) I looked for a string inside mtd4 (if I came some a buffer), but
> changes where too small and without any sequence of printable chars.
>
> There are plenty of longs in the bug report.
>
> Has someone faced something similar?
>
> Regards,
> ---
>      Luiz Angelo Daros de Luca
>             luizluca at gmail.com
>
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