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Add support for the JEDEC RES

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Add support for the JEDEC RES (Read Electronic Signature and Resume from
Powerdown) SPI command to identify older SPI chips which can't handle
JEDEC RDID.

Since RES gives a one-byte identifier which is shared among many
different vendors and even different sizes, we want to match RES as a
last resort if RDID returns 0xff 0xff 0xff.

Corresponding to flashrom svn r235 and coreboot v2 svn r3320.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Peter Stuge <peter@stuge.se>

This is a heavily reworked version of a patch by Fredrik Tolf, which was
Signed-off-by: Fredrik Tolf <fredrik@dolda2000.com>
This commit is contained in:
Carl-Daniel Hailfinger
2008-05-15 03:19:49 +00:00
parent 6dc1d3b8dc
commit 42c5497180
4 changed files with 82 additions and 33 deletions
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5
spi.h
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@ -29,6 +29,11 @@
#define JEDEC_RDID_OUTSIZE 0x01
#define JEDEC_RDID_INSIZE 0x03
/* Read Electronic Signature */
#define JEDEC_RES 0xab
#define JEDEC_RES_OUTSIZE 0x04
#define JEDEC_RES_INSIZE 0x01
/* Write Enable */
#define JEDEC_WREN 0x06
#define JEDEC_WREN_OUTSIZE 0x01