The following is based on work originally posted to the list by Alex
Mauer in 2008, here: http://www.coreboot.org/pipermail/coreboot/2008-October/040212.html
I don't claim to really know what I'm doing ... but I've tested this
on a Winnet P680 v 1.2 motherboard (in a Neoware ca22) with this flash
chip on it. I read the rom, erased it, read the erased image (which
appeared to be empty via od -c), wrote the original rom back, and
rebooted sucessfully.
Thanks,
Jim
(Note: I'm not on the list; please reply directly: jmr at c o m p
u t i n g.com)
Index: flashchips.c
===================================================================
--- flashchips.c (revision 1769)
+++ flashchips.c (working copy)
@@ -4678,6 +4678,33 @@
{
.vendor = "Eon",
+ .name = "EN29F040A",
+ .bustype = BUS_PARALLEL,
+ .manufacture_id = EON_ID,
+ .model_id = EON_EN29F040A,
+ .total_size = 512,
+ .page_size = 64 * 1024,
+ .feature_bits = FEATURE_ADDR_AAA | FEATURE_EITHER_RESET,
+ .tested = TEST_OK_PREW,
+ .probe = probe_jedec,
+ .probe_timing = TIMING_ZERO, /* datasheet specifies no timing
*/
+ .block_erasers =
+ {
+ {
+ .eraseblocks = { {64 * 1024, 8} },
+ .block_erase = erase_sector_jedec,
+ }, {
+ .eraseblocks = { {512 * 1024, 1} },
+ .block_erase = erase_chip_block_jedec,
+ }
+ },
+ .write = write_jedec_1,
+ .read = read_memmapped,
+ .voltage = {4500, 5500},
+ },
+
+ {
+ .vendor = "Eon",
.name = "EN29LV640B",
.bustype = BUS_PARALLEL,
.manufacture_id = EON_ID,
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