Problems with cfi_cmdset_0002 and Atmel AT49BV642D

[Michael König]

Hello Hans-Christian...

> This is from the AVR32 GIT repository at
> git://www.atmel.no/~hskinnemoen/linux/kernel/avr32.git

That's the same fixup_convert_atmel_pri() apart from the two additional 
lines you mentioned earlier.

> Strange... because it should never get added in the
> fixup_use_write_buffers() function. Could you check the ordering in
> cfi_fixup_table[]?
> fixup_convert_atmel_pri must be set _before_ fixup_use_write_buffers. I
> think that might be bogus upstream as well :(

Good call, those entries are the other way round:

static struct cfi_fixup cfi_fixup_table[] = {
#ifdef AMD_BOOTLOC_BUG
	{ CFI_MFR_AMD, CFI_ID_ANY, fixup_amd_bootblock, NULL },
#endif
	{ CFI_MFR_AMD, 0x0050, fixup_use_secsi, NULL, },
	{ CFI_MFR_AMD, 0x0053, fixup_use_secsi, NULL, },
	{ CFI_MFR_AMD, 0x0055, fixup_use_secsi, NULL, },
	{ CFI_MFR_AMD, 0x0056, fixup_use_secsi, NULL, },
	{ CFI_MFR_AMD, 0x005C, fixup_use_secsi, NULL, },
	{ CFI_MFR_AMD, 0x005F, fixup_use_secsi, NULL, },
#if !FORCE_WORD_WRITE
	{ CFI_MFR_ANY, CFI_ID_ANY, fixup_use_write_buffers, NULL, },
#endif
	{ CFI_MFR_ATMEL, CFI_ID_ANY, fixup_convert_atmel_pri, NULL },
	{ 0, 0, NULL, NULL }
};

I moved "fixup_convert_atmel_pri" above "fixup_use_write_buffers" and now 
it works like expected.

>> The funny thing is that do_write_buffer() never seems to write more than
>> two words (in my case 4 bytes), so I don't understand why the bypass
>> mode  isn't used anymore like in a previous incarnation of the code.
>
> Hmmm... interesting, perhaps we can add the dual word write support for
> the Atmel device but have a fixup which sets the last command according
> to the device.

At least my traces show that do_write_buffer() seems to be always called 
with two words. I guess you'll have to do your own testing to confirm that.

> But changes like these should have been posted earlier.

Hopefully those changes will be posted soon, before someone else runs into 
the same problem.

Thanks for your help; now I have a clean solution rather than my crude hack.

-- 
Mit freundlichen Grüßen
Best regards
Michael König

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