Add paranoid checks to sb600spi driver

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>

1 files changed, 1 insertions, 0 deletions

diff --git a/spi.h b/spi.h
index 6f5442a..b908603 100644
--- a/spi.h
+++ b/spi.h
@@ -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__ */