Add support for selecting the erased bit value with a flag
Most flash chips are erased to ones and programmed to zeros. However, some
other chips, such as the ENE KB9012 internal flash, work the opposite way.
Change-Id: Ia7b0de8568e31f9bf263ba0ad6b051e837477b6b
Signed-off-by: Mike Banon <mikebdp2@gmail.com>
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: https://review.coreboot.org/23258
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/flashrom.c b/flashrom.c
index a7de995..26b9863 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -700,12 +700,13 @@
{
int ret;
uint8_t *cmpbuf = malloc(len);
+ const uint8_t erased_value = ERASED_VALUE(flash);
if (!cmpbuf) {
msg_gerr("Could not allocate memory!\n");
exit(1);
}
- memset(cmpbuf, 0xff, len);
+ memset(cmpbuf, erased_value, len);
ret = verify_range(flash, cmpbuf, start, len);
free(cmpbuf);
return ret;
@@ -758,7 +759,8 @@
}
/* Helper function for need_erase() that focuses on granularities of gran bytes. */
-static int need_erase_gran_bytes(const uint8_t *have, const uint8_t *want, unsigned int len, unsigned int gran)
+static int need_erase_gran_bytes(const uint8_t *have, const uint8_t *want, unsigned int len,
+ unsigned int gran, const uint8_t erased_value)
{
unsigned int i, j, limit;
for (j = 0; j < len / gran; j++) {
@@ -768,7 +770,7 @@
continue;
/* have needs to be in erased state. */
for (i = 0; i < limit; i++)
- if (have[j * gran + i] != 0xff)
+ if (have[j * gran + i] != erased_value)
return 1;
}
return 0;
@@ -788,7 +790,8 @@
* @gran write granularity (enum, not count)
* @return 0 if no erase is needed, 1 otherwise
*/
-int need_erase(const uint8_t *have, const uint8_t *want, unsigned int len, enum write_granularity gran)
+int need_erase(const uint8_t *have, const uint8_t *want, unsigned int len,
+ enum write_granularity gran, const uint8_t erased_value)
{
int result = 0;
unsigned int i;
@@ -803,31 +806,31 @@
break;
case write_gran_1byte:
for (i = 0; i < len; i++)
- if ((have[i] != want[i]) && (have[i] != 0xff)) {
+ if ((have[i] != want[i]) && (have[i] != erased_value)) {
result = 1;
break;
}
break;
case write_gran_128bytes:
- result = need_erase_gran_bytes(have, want, len, 128);
+ result = need_erase_gran_bytes(have, want, len, 128, erased_value);
break;
case write_gran_256bytes:
- result = need_erase_gran_bytes(have, want, len, 256);
+ result = need_erase_gran_bytes(have, want, len, 256, erased_value);
break;
case write_gran_264bytes:
- result = need_erase_gran_bytes(have, want, len, 264);
+ result = need_erase_gran_bytes(have, want, len, 264, erased_value);
break;
case write_gran_512bytes:
- result = need_erase_gran_bytes(have, want, len, 512);
+ result = need_erase_gran_bytes(have, want, len, 512, erased_value);
break;
case write_gran_528bytes:
- result = need_erase_gran_bytes(have, want, len, 528);
+ result = need_erase_gran_bytes(have, want, len, 528, erased_value);
break;
case write_gran_1024bytes:
- result = need_erase_gran_bytes(have, want, len, 1024);
+ result = need_erase_gran_bytes(have, want, len, 1024, erased_value);
break;
case write_gran_1056bytes:
- result = need_erase_gran_bytes(have, want, len, 1056);
+ result = need_erase_gran_bytes(have, want, len, 1056, erased_value);
break;
case write_gran_1byte_implicit_erase:
/* Do not erase, handle content changes from anything->0xff by writing 0xff. */
@@ -1772,11 +1775,12 @@
ret = 1;
bool skipped = true;
uint8_t *const curcontents = info->curcontents + info->erase_start;
- if (need_erase(curcontents, newcontents, erase_len, flashctx->chip->gran)) {
+ const uint8_t erased_value = ERASED_VALUE(flashctx);
+ if (need_erase(curcontents, newcontents, erase_len, flashctx->chip->gran, erased_value)) {
if (erase_block(flashctx, info, erasefn))
goto _free_ret;
/* Erase was successful. Adjust curcontents. */
- memset(curcontents, 0xff, erase_len);
+ memset(curcontents, erased_value, erase_len);
skipped = false;
}