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SubjectRe: [PATCH] ARM: BCM5301X: Fix NAND ECC parameters for Linksys Panamera
On Wed, Apr 25, 2018 at 11:02:04AM +0200, Rafał Miłecki wrote:
> > [ 13.530863] ubi0 warning: 0xc037c9e4: error -74 (ECC error) while reading 64 bytes from PEB 115:0, read only 64 bytes, retry
> > [ 13.542763] ubi0 warning: 0xc037c9e4: error -74 (ECC error) while reading 64 bytes from PEB 115:0, read only 64 bytes, retry
> > [ 13.554659] ubi0 warning: 0xc037c9e4: error -74 (ECC error) while reading 64 bytes from PEB 115:0, read only 64 bytes, retry
> > [ 13.566548] ubi0 error: 0xc037ca08: error -74 (ECC error) while reading 64 bytes from PEB 115:0, read 64 bytes
> > [ 13.576574] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.25 #0
> > [ 13.582589] Hardware name: BCM5301X
> > [ 13.586078] Backtrace:
> > [ 13.588526] Function entered at [<c0105ccc>] from [<c0105fb4>]
> > [ 13.594368] r7:00000000 r6:60000013 r5:00000000 r4:c081d988
> > [ 13.600032] Function entered at [<c0105f9c>] from [<c04f29a8>]
> > [ 13.605872] Function entered at [<c04f2918>] from [<c037ca0c>]
> > [ 13.611714] r7:00000000 r6:00000040 r5:c7954000 r4:ffffffb6
> > [ 13.617378] Function entered at [<c037c7dc>] from [<c037cd1c>]
> > [ 13.623223] r10:00000000 r9:00000040 r8:00000073 r7:c7954000 r6:c7979000 r5:c7036180
> > [ 13.631071] r4:c7b72900
> > [ 13.633604] Function entered at [<c037cca4>] from [<c0381c5c>]
> > [ 13.639447] r10:00000000 r9:c7979800 r8:c7954000 r7:c7979000 r6:00000073 r5:c7036180
> > [ 13.647286] r4:c7b72900
> > [ 13.649819] Function entered at [<c0381a84>] from [<c0376d74>]
> > [ 13.655663] r10:c7954040 r9:00000840 r8:c702e400 r7:00000000 r6:c702e400 r5:c7954000
> > [ 13.663510] r4:fffff800
> > [ 13.666042] Function entered at [<c0376720>] from [<c0717b9c>]
> > [ 13.671886] r10:c0813a88 r9:c0651c18 r8:c0651bec r7:c084ff48 r6:c081e440 r5:c7823ea4
> > [ 13.679725] r4:c702e400
> > [ 13.682258] Function entered at [<c0717954>] from [<c0101a8c>]
> > [ 13.688103] r10:c072e83c r9:c07366b8 r8:c0717954 r7:c072e838 r6:c081e440 r5:00000000
> > [ 13.695949] r4:c0803c08
> > [ 13.698482] Function entered at [<c01019dc>] from [<c0700e38>]
> > [ 13.704327] r9:c07366b8 r8:c0700594 r7:c072e838 r6:c081e440 r5:c081e440 r4:00000008
> > [ 13.712087] Function entered at [<c0700cf8>] from [<c0506adc>]
> > [ 13.717930] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c0506acc
> > [ 13.725769] r4:00000000
> > [ 13.728303] Function entered at [<c0506acc>] from [<c0102788>]
> > [ 13.734144] r5:c0506acc r4:00000000
>
> This is expected if you previously were using firmware programming flash
> in non-BCH8 mode. The main reason for what you're seeing is that when
> flashing image with CFE it doesn't erase all NAND pages.
>
> If previously you were using firmware programming flash in BCH1 mode, it
> means that after flashing firmware using BCH8 you'll end up with mess in
> ECC.
>
> Part of NAND flash programmed by CFE will use BCH8.
> Part of NAND flash that remained from previous fw will use BCH1.
> Linux will fail to read part of NAND flash from prev installation.
>
> The cleanest solution: erase all NAND content of firmware partition
> before flashing firmware using BCH8.
>
> The easiest solution: ignore all these "error -74 (ECC error) while
> reading" errors (they may last for few minutes!). I believe UBI should
> simply recreate all pages it couldn't access and once you wait long
> enough, all your NAND flash will be using BCH8.

Let me build the firmware with BCH-8 and wait it out. I'll report back my
results.

Thanks,

Vivek

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