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@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