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| author | Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> | 2008-05-14 12:03:06 +0000 |
|---|---|---|
| committer | Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> | 2008-05-14 12:03:06 +0000 |
| commit | 68db3a2bdc335519003c7f18ead043d7507718aa (patch) | |
| tree | 581d02c85a09d3370291069b9fb0f393fee1f0a3 /util | |
| parent | b69e46bca3ee8e25ee45ba04ff812e507fccb0fc (diff) | |
| download | coreboot-68db3a2bdc335519003c7f18ead043d7507718aa.tar.xz | |
Check the JEDEC vendor ID for correct parity. 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.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3308 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'util')
| -rw-r--r-- | util/flashrom/flash.h | 1 | ||||
| -rw-r--r-- | util/flashrom/jedec.c | 13 | ||||
| -rw-r--r-- | util/flashrom/spi.c | 4 |
3 files changed, 17 insertions, 1 deletions
diff --git a/util/flashrom/flash.h b/util/flashrom/flash.h index 67f49c6932..37d7dc0caf 100644 --- a/util/flashrom/flash.h +++ b/util/flashrom/flash.h @@ -396,6 +396,7 @@ int it8716f_spi_chip_write(struct flashchip *flash, uint8_t *buf); void it8716f_spi_page_program(int block, uint8_t *buf, uint8_t *bios); /* jedec.c */ +uint8_t oddparity(uint8_t val); void toggle_ready_jedec(volatile uint8_t *dst); void data_polling_jedec(volatile uint8_t *dst, uint8_t data); void unprotect_jedec(volatile uint8_t *bios); diff --git a/util/flashrom/jedec.c b/util/flashrom/jedec.c index 958875194a..e818294f0e 100644 --- a/util/flashrom/jedec.c +++ b/util/flashrom/jedec.c @@ -27,6 +27,14 @@ #define MAX_REFLASH_TRIES 0x10 +/* Check one byte for odd parity */ +uint8_t oddparity(uint8_t val) +{ + val = (val ^ (val >> 4)) & 0xf; + val = (val ^ (val >> 2)) & 0x3; + return (val ^ (val >> 1)) & 0x1; +} + void toggle_ready_jedec(volatile uint8_t *dst) { unsigned int i = 0; @@ -123,7 +131,10 @@ int probe_jedec(struct flashchip *flash) *(volatile uint8_t *)(bios + 0x5555) = 0xF0; myusec_delay(40); - printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, largeid1, largeid2); + printf_debug("%s: id1 0x%x, id2 0x%x", __FUNCTION__, largeid1, largeid2); + if (!oddparity(id1)) + printf_debug(", id1 parity violation"); + printf_debug("\n"); if (largeid1 == flash->manufacture_id && largeid2 == flash->model_id) return 1; diff --git a/util/flashrom/spi.c b/util/flashrom/spi.c index 5cfc052103..786d555ee9 100644 --- a/util/flashrom/spi.c +++ b/util/flashrom/spi.c @@ -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 { |