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| author | Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> | 2014-06-16 22:36:17 +0000 |
|---|---|---|
| committer | Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> | 2014-06-16 22:36:17 +0000 |
| commit | c7ea4ae02c69fdc4837511582f654255e10fba4a (patch) | |
| tree | bcd073d982639a0e055f777a48154bf026b99d18 | |
| parent | 38bae33cd41cee6473b320d7517da6ac5c8472be (diff) | |
| download | flashrom-c7ea4ae02c69fdc4837511582f654255e10fba4a.zip flashrom-c7ea4ae02c69fdc4837511582f654255e10fba4a.tar.gz | |
EEPROM support: handle implicit erase
Add support for EEPROMs with 1 byte granularity and implicit erase on
write. flashrom will not try to erase before write on these chips.
Explicitly requested erase with -E is done by writing 0xff.
Corresponding to flashrom svn r1822.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
| -rw-r--r-- | flash.h | 1 | ||||
| -rw-r--r-- | flashrom.c | 5 |
2 files changed, 6 insertions, 0 deletions
@@ -87,6 +87,7 @@ enum write_granularity { write_gran_528bytes, /* If less than 528 bytes are written, the unwritten bytes are undefined. */ write_gran_1024bytes, /* If less than 1024 bytes are written, the unwritten bytes are undefined. */ write_gran_1056bytes, /* If less than 1056 bytes are written, the unwritten bytes are undefined. */ + write_gran_1byte_implicit_erase, /* EEPROMs and other chips with implicit erase and 1-byte writes. */ }; /* @@ -766,6 +766,10 @@ int need_erase(const uint8_t *have, const uint8_t *want, unsigned int len, enum case write_gran_1056bytes: result = need_erase_gran_bytes(have, want, len, 1056); break; + case write_gran_1byte_implicit_erase: + /* Do not erase, handle content changes from anything->0xff by writing 0xff. */ + result = 0; + break; default: msg_cerr("%s: Unsupported granularity! Please report a bug at " "flashrom@flashrom.org\n", __func__); @@ -807,6 +811,7 @@ static unsigned int get_next_write(const uint8_t *have, const uint8_t *want, uns switch (gran) { case write_gran_1bit: case write_gran_1byte: + case write_gran_1byte_implicit_erase: stride = 1; break; case write_gran_256bytes: |
