Author: hailfinger Date: Tue Jun 17 00:36:17 2014 New Revision: 1822 URL: http://flashrom.org/trac/flashrom/changeset/1822
Log: 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.
Signed-off-by: Carl-Daniel Hailfinger c-d.hailfinger.devel.2006@gmx.net Acked-by: Stefan Tauner stefan.tauner@alumni.tuwien.ac.at
Modified: trunk/flash.h trunk/flashrom.c
Modified: trunk/flash.h ============================================================================== --- trunk/flash.h Fri Jun 13 00:57:36 2014 (r1821) +++ trunk/flash.h Tue Jun 17 00:36:17 2014 (r1822) @@ -87,6 +87,7 @@ 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. */ };
/*
Modified: trunk/flashrom.c ============================================================================== --- trunk/flashrom.c Fri Jun 13 00:57:36 2014 (r1821) +++ trunk/flashrom.c Tue Jun 17 00:36:17 2014 (r1822) @@ -766,6 +766,10 @@ 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 @@ switch (gran) { case write_gran_1bit: case write_gran_1byte: + case write_gran_1byte_implicit_erase: stride = 1; break; case write_gran_256bytes: