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Add paranoid checks to sb600spi driver

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Add paranoid checks for correct values in essential registers in the SB600/SB700/... SPI driver. If something else changes the values we
wrote, we will see severe read/write corruption.
sb600spi will now abort the access and return an error if it detects
this sort of corruption.

Note: This corruption can be caused by a few different events:
- IPMI/BMC/IMC accesses flash
- Other software accesses flash
The nature of flash access (read/write/ID/...) is irrelevant. Each such
access will cause corruption for all other accesses happening at the
same time.

Thanks to Matthias Kretz for testing this patch.

Corresponding to flashrom svn r1145.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Matthias Kretz <kretz@kde.org>
This commit is contained in:
Carl-Daniel Hailfinger
2010-08-18 15:12:43 +00:00
parent a84b0bd6ad
commit eb0e7fc4f0
2 changed files with 75 additions and 7 deletions
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1
spi.h
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@ -124,5 +124,6 @@
#define SPI_INVALID_ADDRESS -3
#define SPI_INVALID_LENGTH -4
#define SPI_FLASHROM_BUG -5
#define SPI_PROGRAMMER_ERROR -6
#endif /* !__SPI_H__ */