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EEPROM support: handle implicit erase

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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>
This commit is contained in:
Carl-Daniel Hailfinger 2014-06-16 22:36:17 +00:00
parent 600576b43d
commit 1b0e9fc8ea
2 changed files with 6 additions and 0 deletions
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1
flash.h
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@ -87,6 +87,7 @@ enum write_granularity {
write_gran_528bytes, /* If less than 528 bytes are written, the unwritten bytes are undefined. */ 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_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_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. */
}; };
/* /*

5
flashrom.c
View File

@ -766,6 +766,10 @@ int need_erase(const uint8_t *have, const uint8_t *want, unsigned int len, enum
case write_gran_1056bytes: case write_gran_1056bytes:
result = need_erase_gran_bytes(have, want, len, 1056); result = need_erase_gran_bytes(have, want, len, 1056);
break; break;
case write_gran_1byte_implicit_erase:
/* Do not erase, handle content changes from anything->0xff by writing 0xff. */
result = 0;
break;
default: default:
msg_cerr("%s: Unsupported granularity! Please report a bug at " msg_cerr("%s: Unsupported granularity! Please report a bug at "
"flashrom@flashrom.org\n", __func__); "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) { switch (gran) {
case write_gran_1bit: case write_gran_1bit:
case write_gran_1byte: case write_gran_1byte:
case write_gran_1byte_implicit_erase:
stride = 1; stride = 1;
break; break;
case write_gran_256bytes: case write_gran_256bytes: