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Check the JEDEC vendor ID for correct parity

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Flash chips which can be detected by JEDEC probe routines all have
vendor IDs with correct parity. Use a parity check as additional hint
whether a vendor ID makes sense. Note: Device IDs have no parity
requirements whatsoever.

Corresponding to flashrom svn r231 and coreboot v2 svn r3308.

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
2008-05-14 12:03:06 +00:00
parent 4e84dfb784
commit a758f5100d
3 changed files with 17 additions and 1 deletions
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4
spi.c
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@ -71,8 +71,12 @@ int probe_spi(struct flashchip *flash)
uint32_t manuf_id;
uint32_t model_id;
if (!spi_rdid(readarr)) {
if (!oddparity(readarr[0]))
printf_debug("RDID byte 0 parity violation.\n");
/* Check if this is a continuation vendor ID */
if (readarr[0] == 0x7f) {
if (!oddparity(readarr[1]))
printf_debug("RDID byte 1 parity violation.\n");
manuf_id = (readarr[0] << 8) | readarr[1];
model_id = readarr[2];
} else {