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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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41
util/flashrom/spi.c
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@ -49,6 +49,16 @@ static int spi_rdid(unsigned char *readarr)
return 0;
}
static int spi_res(unsigned char *readarr)
{
const unsigned char cmd[JEDEC_RES_OUTSIZE] = {JEDEC_RES, 0, 0, 0};
if (spi_command(JEDEC_RES_OUTSIZE, JEDEC_RES_INSIZE, cmd, readarr))
return 1;
printf_debug("RES returned %02x.\n", readarr[0]);
return 0;
}
void spi_write_enable()
{
const unsigned char cmd[JEDEC_WREN_OUTSIZE] = {JEDEC_WREN};
@ -65,7 +75,7 @@ void spi_write_disable()
spi_command(JEDEC_WRDI_OUTSIZE, JEDEC_WRDI_INSIZE, cmd, NULL);
}
int probe_spi(struct flashchip *flash)
int probe_spi_rdid(struct flashchip *flash)
{
unsigned char readarr[3];
uint32_t manuf_id;
@ -102,6 +112,35 @@ int probe_spi(struct flashchip *flash)
return 0;
}
int probe_spi_res(struct flashchip *flash)
{
unsigned char readarr[3];
uint32_t model_id;
if (!spi_rdid(readarr)) {
/* Check if RDID returns 0xff 0xff 0xff, then we use RES. */
if ((readarr[0] != 0xff) || (readarr[1] != 0xff) ||
(readarr[2] != 0xff))
return 0;
} else {
/* We couldn't issue RDID, it's pointless to try RES. */
return 0;
}
if (!spi_res(readarr)) {
model_id = readarr[0];
printf_debug("%s: id 0x%x\n", __FUNCTION__, model_id);
if (model_id == flash->model_id) {
/* Print the status register to tell the
* user about possible write protection.
*/
spi_prettyprint_status_register(flash);
return 1;
}
}
return 0;
}
uint8_t spi_read_status_register()
{
const unsigned char cmd[JEDEC_RDSR_OUTSIZE] = {JEDEC_RDSR};