[flashrom] [PATCH] Real partial writes

[Carl-Daniel Hailfinger]

On 26.10.2010 19:22, Carl-Daniel Hailfinger wrote:
> On 26.10.2010 16:27, Idwer Vollering wrote:
>   
>> 2010/10/22 Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006 at gmx.net>
>>
>>   
>>     
>>> Given that the version which addresses the review comments apparently is
>>> buggy, I hereby propose to merge the earlier version which worked. It is
>>> here again for your reference with some slight cosmetic fixes which
>>> should not impact functionality.
>>> Error recovery still needs work (see the FIXME comment). It will work in
>>> most cases, but if a given erase command for a block only erased parts
>>> of the block (partial write lock), the code will make incorrect
>>> assumptions.
>>>
>>> If anyone feels adventurous, I would love to see logs on Intel/VIA
>>> chipsets with SPI (preferably locked down chipsets or with r1193 reverted).
>>>
>>> If you're going to review this, make sure you keep a stack of bananas
>>> (quickly mobilized carbohydrates for your brain), a bucket of ice (to
>>> prevent brain overheating) and a bottle of aspirin handy. If any code is
>>> unclear, please tell me and I'll try to add comments to improve
>>> readability.
>>>
>>> This code has been tested. Testing erase (and checking with a separate
>>> readback that erase actually worked) and write (same test with separate
>>> readback) would be highly appreciated. Verbose logs are even more
>>> appreciated.
>>>
>>> I think the code is ready for merge if you trust write/erase to never
>>> fail. The error cases still need to be tested. Should we reread the
>>> whole chip if write/erase failed to make sure our current view of the
>>> chip contents is not stale?
>>>
>>> This patch makes flashrom use real partial writes. If you write an image
>>> full of 0xff, flashrom will erase and detect that no write is needed. If
>>> you write an image which differs only in some parts from the current
>>> flash contents, flashrom will detect that and not touch unchanged areas.
>>>
>>> Fix a long-standing bug in need_erase() for 256 byte granularity as well.
>>>
>>> Nice side benefit: Detailed progress printing.
>>> S means skipped
>>> E means erased
>>> W means written
>>>
>>> Thanks to Andrew Morgan for testing countless iterations of this patch.
>>> Thanks to Richard A. Smith for testing on Dediprog.
>>> Thanks to David Hendricks for the review (will be addressed later).
>>>
>>> Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006 at gmx.net>
>>>
>>>     
>>>       
>> With your latest patch (http://patchwork.coreboot.org/patch/2160/) applied:
>>
>> $ sudo ./flashrom -p nicintel_spi -V -w nicintel_spi.rom -c M25P10.RES
>> flashrom v0.9.3-r1215 on FreeBSD 8.1-RELEASE (i386), built with libpci
>> 3.1.7, GCC 4.2.1 20070719  [FreeBSD], little endian
>> Calibrating delay loop... OK.
>> Initializing nicintel_spi programmer
>> Found "Intel 82541PI Gigabit Ethernet Controller" (8086:107c, BDF 01:03.0).
>> Probing for ST M25P10.RES, 128 KB: probe_spi_res1: id 0x10
>> Chip status register is 00
>> Found chip "ST M25P10.RES" (128 KB, SPI) at physical address 0xfffe0000.
>> Reading old flash chip contents...
>> Erasing and writing flash chip... Looking at blockwise erase function 0...
>> trying... 0x000000-0x007fff:W, 0x008000-0x00ffff:W, 0x010000-0x017fff:W,
>> 0x018000-0x01ffff:S
>> Done.
>> Verifying flash... VERIFY FAILED at 0x00008000! Expected=0xc6, Read=0x15,
>> failed byte count from 0x00000000-0x0001ffff: 0x8d75
>>   
>>     
>
> Crap. Could you please retest http://patchwork.coreboot.org/patch/2155/ ?
>
> If that one works, I am tempted to commit it, and send all other changes
> as separate patches on top.
>   

Idwer tested this patch together with patch 2155 from patchwork and it
worked.
http://paste.flashrom.org/view.php?id=138

Regards,
Carl-Daniel

-- 
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