summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--util/flashrom/jedec.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/util/flashrom/jedec.c b/util/flashrom/jedec.c
index 46153dd66c..30d0cdadd2 100644
--- a/util/flashrom/jedec.c
+++ b/util/flashrom/jedec.c
@@ -89,7 +89,11 @@ int probe_jedec(struct flashchip *flash)
*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
myusec_delay(10);
*(volatile uint8_t *)(bios + 0x5555) = 0x90;
- myusec_delay(10);
+ /* Older chips may need up to 100 us to respond. The ATMEL 29C020
+ * needs 10 ms according to the data sheet, but it has been tested
+ * to work reliably with 20 us. Allow a factor of 2 safety margin.
+ */
+ myusec_delay(40);
/* Read product ID */
id1 = *(volatile uint8_t *)bios;
@@ -101,7 +105,7 @@ int probe_jedec(struct flashchip *flash)
*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
myusec_delay(10);
*(volatile uint8_t *)(bios + 0x5555) = 0xF0;
- myusec_delay(10);
+ myusec_delay(40);
printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
if (id1 == flash->manufacture_id && id2 == flash->model_id)