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

Luiz Angelo Daros de Luca luizluca at gmail.com
Thu Feb 6 17:44:04 EST 2020


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?

     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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