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Add support for selecting the erased bit value with a flag

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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>
This commit is contained in:
Paul Kocialkowski
2018-01-15 01:06:09 +03:00
committed by Nico Huber
parent 31b5e3bfe6
commit 995f755ff5
2 changed files with 26 additions and 15 deletions
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32
flashrom.c
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@@ -700,12 +700,13 @@ int check_erased_range(struct flashctx *flash, unsigned int start,
{
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 @@ out_free:
}
/* 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 @@ static int need_erase_gran_bytes(const uint8_t *have, const uint8_t *want, unsig
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 @@ static int need_erase_gran_bytes(const uint8_t *have, const uint8_t *want, unsig
* @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 @@ int need_erase(const uint8_t *have, const uint8_t *want, unsigned int len, enum
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 @@ static int read_erase_write_block(struct flashctx *const flashctx,
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;
}