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Flashrom already has the following probe functions

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- probe_spi_rdid with opcode 0x9f, usually 3 bytes ID
- probe_spi_res with opcode 0xab, usually 1 byte ID
We are missing the following probe function:
- probe_spi_rems with opcode 0x90, usually 2 bytes ID

RDID provides best specifity (manufacturer, device class and device) and
RES is supported by quite a few old chips. However, RES only returns one
byte and there are multiple flash chips with different sizes on the
market and all of them have the same RES ID.
REMS is from the same age as RES, but it provides a manufacturer and a
device ID. It is therefore on par with the probing for parallel flash
chips and specific enough.

The order in which chips should be detected is as follows:
1. RDID
2. REMS
3. RES

Corresponding to flashrom svn r349 and coreboot v2 svn r3775.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Peter Stuge <peter@stuge.se>
This commit is contained in:
Carl-Daniel Hailfinger
2008-11-28 01:25:00 +00:00
parent 92a54ca030
commit 14e50ac123
3 changed files with 47 additions and 0 deletions
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1
flash.h
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@ -449,6 +449,7 @@ extern char *lb_part, *lb_vendor;
/* spi.c */
int probe_spi_rdid(struct flashchip *flash);
int probe_spi_rdid4(struct flashchip *flash);
int probe_spi_rems(struct flashchip *flash);
int probe_spi_res(struct flashchip *flash);
int spi_command(unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr, unsigned char *readarr);