Most flash chips are erased to ones and programmed to zeros. However, some other
flash chips, such as the ENE KB9012 internal flash, work the opposite way.
Signed-off-by: Paul Kocialkowski <contact(a)paulk.fr>
---
flash.h | 5 ++++-
flashrom.c | 39 +++++++++++++++++++++------------------
2 files changed, 25 insertions(+), 19 deletions(-)
diff --git a/flash.h b/flash.h
index da049d1..dc5c140 100644
--- a/flash.h
+++ b/flash.h
@@ -123,6 +123,9 @@ enum write_granularity {
#define FEATURE_WRSR_EITHER (FEATURE_WRSR_EWSR | FEATURE_WRSR_WREN)
#define FEATURE_OTP (1 << 8)
#define FEATURE_QPI (1 << 9)
+#define FEATURE_ERASED_ZERO (1 << 10)
+
+#define ERASED_VALUE(flash) (((flash)->chip->feature_bits & FEATURE_ERASED_ZERO) ? 0x00 : 0xff)
enum test_state {
OK = 0,
@@ -275,7 +278,7 @@ int probe_flash(struct registered_master *mst, int startchip, struct flashctx *f
int read_flash_to_file(struct flashctx *flash, const char *filename);
char *extract_param(const char *const *haystack, const char *needle, const char *delim);
int verify_range(struct flashctx *flash, const uint8_t *cmpbuf, unsigned int start, unsigned int len);
-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);
void print_version(void);
void print_buildinfo(void);
void print_banner(void);
diff --git a/flashrom.c b/flashrom.c
index 25e53f2..d5c3238 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -696,12 +696,13 @@ 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;
@@ -754,7 +755,7 @@ 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++) {
@@ -764,7 +765,7 @@ 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;
@@ -784,7 +785,7 @@ 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;
@@ -799,31 +800,31 @@ 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. */
@@ -1470,6 +1471,7 @@ static int erase_and_write_block_helper(struct flashctx *flash,
unsigned int starthere = 0, lenhere = 0;
int ret = 0, skip = 1, writecount = 0;
enum write_granularity gran = flash->chip->gran;
+ const uint8_t erased_value = ERASED_VALUE(flash);
/* curcontents and newcontents are opaque to walk_eraseregions, and
* need to be adjusted here to keep the impression of proper abstraction
@@ -1477,7 +1479,7 @@ static int erase_and_write_block_helper(struct flashctx *flash,
curcontents += start;
newcontents += start;
msg_cdbg(":");
- if (need_erase(curcontents, newcontents, len, gran)) {
+ if (need_erase(curcontents, newcontents, len, gran, erased_value)) {
msg_cdbg("E");
ret = erasefn(flash, start, len);
if (ret)
@@ -1487,7 +1489,7 @@ static int erase_and_write_block_helper(struct flashctx *flash,
return -1;
}
/* Erase was successful. Adjust curcontents. */
- memset(curcontents, 0xff, len);
+ memset(curcontents, erased_value, len);
skip = 0;
}
/* get_next_write() sets starthere to a new value after the call. */
@@ -1984,6 +1986,7 @@ int doit(struct flashctx *flash, int force, const char *filename, int read_it,
int ret = 0;
unsigned long size = flash->chip->total_size * 1024;
int read_all_first = 1; /* FIXME: Make this configurable. */
+ const uint8_t erased_value = ERASED_VALUE(flash);
if (chip_safety_check(flash, force, read_it, write_it, erase_it, verify_it)) {
msg_cerr("Aborting.\n");
@@ -2010,15 +2013,15 @@ int doit(struct flashctx *flash, int force, const char *filename, int read_it,
msg_gerr("Out of memory!\n");
exit(1);
}
- /* Assume worst case: All bits are 0. */
- memset(oldcontents, 0x00, size);
+ /* Assume worst case: All bits are not erased. */
+ memset(oldcontents, ~erased_value, size);
newcontents = malloc(size);
if (!newcontents) {
msg_gerr("Out of memory!\n");
exit(1);
}
- /* Assume best case: All bits should be 1. */
- memset(newcontents, 0xff, size);
+ /* Assume best case: All bits should be erased. */
+ memset(newcontents, erased_value, size);
/* Side effect of the assumptions above: Default write action is erase
* because newcontents looks like a completely erased chip, and
* oldcontents being completely 0x00 means we have to erase everything
--
2.6.4