[flashrom] [PATCH] Check if an erase is needed to write

Carl-Daniel Hailfinger c-d.hailfinger.devel.2006 at gmx.net
Thu Feb 11 15:31:57 CET 2010

This patch is 5 months old and it would be awesome if someone could
review it.
We need this if we ever want to support partial writes.

On 22.12.2009 02:38, Carl-Daniel Hailfinger wrote:
> On 23.11.2009 15:33, Carl-Daniel Hailfinger wrote:
>> On 19.11.2009 17:51, Carl-Daniel Hailfinger wrote:  
>>> To summarize: Write granularity is chip specific. The following write
>>> granularities exist according to my datasheet survey:
>>> - 1 bit. Each bit can be cleared individually.
>>> - 1 byte. A byte can be written once. Further writes to an already
>>> written byte cause the contents to be either undefined or to stay unchanged.
>>> - 128 bytes. If less than 128 bytes are written, the rest will be
>>> erased. Each write to a 128-byte region will trigger an automatic erase
>>> before anything is written. Very uncommon behaviour.
>>> - 256 bytes. If less than 256 bytes are written, the contents of the
>>> unwritten bytes are undefined.
>> New patch. Handle 1-bit, 1-byte and 256-byte write granularity.
>> Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006 at gmx.net>
> Ping?
> This is http://patchwork.coreboot.org/patch/582/ in case you want to
> look at the patch again.


Developer quote of the year:
"We are juggling too many chainsaws and flaming arrows and tigers."

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