[LEDE-DEV] mtd: spi-nor: fix Spansion regressions (aliased with Winbond)

[Matthias Schiffer]

On 04/06/2017 05:45 AM, Joe Ayers wrote:
> Matthias,  was there ever a conclusion to this post:
> http://lists.infradead.org/pipermail/linux-mtd/2016-March/066348.html
> ?
> 
> My interest from http://www.aredn.org is support for Ubiquiti
> PBE-M5-620 and I suspect this issue is related.
> 
> [ 0.542840] m25p80 spi0.0: found s25fl064k, expected m25p80
> [ 0.548580] m25p80 spi0.0: s25fl064k (8192 Kbytes)
> 
> In current LEDE release using rocket-m-xw it boots with errors below.
> Any pointers on what needs to be done?
> 
> Regards,
> 
> Joe AE6XE

Ugh, I was sure I had at least pushed a temporary fix ([1] and [2]) to LEDE
after not coming to a conclusion upstream quickly, but it seems I forgot
that. By now, the patches are bitrotten... I should pick up the upstream
discussion and finally get this fixed properly. I'm currently working on a
few other things, but I hope I'll eventually get to it.

Matthias


[1]
https://github.com/freifunk-gluon/gluon/blob/v2016.2.x/patches/openwrt/0030-kernel-mtd-spi-nor-wait-until-status-register-writes-are-ready.patch
[2]
https://github.com/freifunk-gluon/gluon/blob/v2016.2.x/patches/openwrt/0031-kernel-mtd-spi-nor-unlock-Winbond-flashs.patch




> 
> [   15.648842] jffs2_scan_eraseblock(): End of filesystem marker found at 0x0
> [   15.655839] jffs2_build_filesystem(): unlocking the mtd device... done.
> [   15.662627] jffs2_build_filesystem(): erasing all blocks after the
> end marker...
> [   15.689881] jffs2: Newly-erased block contained word 0x19852003 at
> offset 0x00430000
>    --- a lot more removed and uninteresting ----
> [   17.540053] jffs2: Newly-erased block contained word 0xc0bff600 at
> offset 0x00010000
> [   17.570020] jffs2: Newly-erased block contained word 0xdeadc0de at
> offset 0x00000000
> [   17.577888] done.
> [   17.579908] jffs2: notice: (789) jffs2_build_xattr_subsystem:
> complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan)
> and 0 of xref (0 dead, 0 orphan) found.
> 
> 
> root at LEDE:~# df -h
> Filesystem                Size      Used Available Use% Mounted on
> /dev/root                 2.0M      2.0M         0 100% /rom
> tmpfs                    29.5M     60.0K     29.5M   0% /tmp
> tmpfs                    29.5M     40.0K     29.5M   0% /tmp/root
> overlayfs:/tmp/root      29.5M     40.0K     29.5M   0% /
> tmpfs                   512.0K         0    512.0K   0% /dev
> /dev/mtdblock5            4.3M      4.3M         0 100% /rom/overlay
> 


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