diff options
Diffstat (limited to 'jedec.c')
| -rw-r--r-- | jedec.c | 20 |
1 files changed, 18 insertions, 2 deletions
@@ -91,6 +91,22 @@ int probe_jedec(struct flashchip *flash) uint8_t id1, id2; uint32_t largeid1, largeid2; uint32_t flashcontent1, flashcontent2; + int probe_timing_enter, probe_timing_exit; + + if (flash->probe_timing > 0) + probe_timing_enter = probe_timing_exit = flash->probe_timing; + else if (flash->probe_timing == TIMING_ZERO) { /* No delay. */ + probe_timing_enter = probe_timing_exit = 0; + } else if (flash->probe_timing == TIMING_FIXME) { /* == _IGNORED */ + printf_debug("Chip lacks correct probe timing information, " + "using default 10mS/40uS\n"); + probe_timing_enter = 10000; + probe_timing_exit = 40; + } else { + printf("Chip has negative value in probe_timing, failing " + "without chip access\n"); + return 0; + } /* Issue JEDEC Product ID Entry command */ chip_writeb(0xAA, bios + 0x5555); @@ -101,7 +117,7 @@ int probe_jedec(struct flashchip *flash) /* Older chips may need up to 100 us to respond. The ATMEL 29C020 * needs 10 ms according to the data sheet. */ - myusec_delay(10000); + myusec_delay(probe_timing_enter); /* Read product ID */ id1 = chip_readb(bios); @@ -127,7 +143,7 @@ int probe_jedec(struct flashchip *flash) chip_writeb(0x55, bios + 0x2AAA); myusec_delay(10); chip_writeb(0xF0, bios + 0x5555); - myusec_delay(40); + myusec_delay(probe_timing_exit); printf_debug("%s: id1 0x%02x, id2 0x%02x", __FUNCTION__, largeid1, largeid2); if (!oddparity(id1)) |