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Add support for the JEDEC RES (Read Electronic Signature and Resume from

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Powerdown) SPI command to flashrom 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.

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>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3320 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Carl-Daniel Hailfinger
2008-05-15 03:19:49 +00:00
parent c7d29013db
commit a4868c44b5
4 changed files with 82 additions and 33 deletions
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5
util/flashrom/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