Hi to all, I used flashrom to flash the BIOS on a AxiomTek SBC84500, which mounts a Winbond W29C020C. All is recognized fine, but the flashing fails.
# flashrom -v -w axiom.bin
No LinuxBIOS table found.
Enabling flash write on CS5530...OK
W29C020C found at physical address: 0xfffc0000
Flash part is S29C51002T (256 KB)
Flash image seems to be a legacy BIOS. Disabling checks.
Programming Page: 2047 at address: 0x0003ff80
Verifying flash - FAILED.
Trying fo find out the cause of the failure I eventually found a grave
error in jedec.c, at write_page_write_jedec(). The code:
if (*src == 0xFF)
continue;
*dst++ = *src++;
is, of course, wrong. It should be
if (*src != 0xFF )
*dst = *src;
dst++;
src++;
I include a patch which fixes this error. But this is not enough.
Sector writes sometimes fail, so included a check/rewrite code
similar to write_byte_program_jedec(). Maybe this is not the best way
to do the task, but at least for me works :)
Furthermore, the patch adds support for the SyncMos S29C51002T 256K
flash. Tested successfully on a Boser HS-2603. It is high probable that
the same configuration would work with all the chips of the same family.
# flashrom -v -w boser.bin
No LinuxBIOS table found.
Enabling flash write on CS5530...OK
S29C51002T found at physical address: 0xfffc0000
Flash part is S29C51002T (256 KB)
Flash image seems to be a legacy BIOS. Disabling checks.
Programming Page: 2047 at address: 0x0003ff80
Verifying flash - VERIFIED
That's all.
Ciao.
Index: jedec.c
===================================================================
--- jedec.c (revision 2497)
+++ jedec.c (working copy)
@@ -134,23 +134,48 @@
int write_page_write_jedec(volatile uint8_t *bios, uint8_t *src,
volatile uint8_t *dst, int page_size)
{
- int i;
+ int i, tried = 0, start_index = 0, ok;
+ volatile uint8_t *d = dst;
+ uint8_t *s = src;
+retry:
/* Issue JEDEC Data Unprotect comand */
*(volatile uint8_t *) (bios + 0x5555) = 0xAA;
*(volatile uint8_t *) (bios + 0x2AAA) = 0x55;
*(volatile uint8_t *) (bios + 0x5555) = 0xA0;
/* transfer data from source to destination */
- for (i = 0; i < page_size; i++) {
+ for (i = start_index; i < page_size; i++) {
/* If the data is 0xFF, don't program it */
- if (*src == 0xFF)
- continue;
- *dst++ = *src++;
+ if (*src != 0xFF )
+ *dst = *src;
+ dst++;
+ src++;
}
toggle_ready_jedec(dst - 1);
+ dst = d;
+ src = s;
+ ok = 1;
+ for (i = 0; i < page_size; i++) {
+ if (*src != 0xFF)
+ if ( *dst != *src )
+ {
+ ok = 0;
+ break;
+ }
+ dst++;
+ src++;
+ }
+
+ if (!ok && tried++ < 0x10) {
+ start_index = i;
+ goto retry;
+ }
+ if (!ok) {
+ fprintf( stderr, " page %d failed!\n", (d-bios)/page_size );
+ }
return 0;
}
Index: flashchips.c
===================================================================
--- flashchips.c (revision 2497)
+++ flashchips.c (working copy)
@@ -114,6 +114,8 @@
#endif
{"LHF00L04", SHARP_ID, SHARP_LHF00L04, NULL,
1024, 64 * 1024,
probe_lhf00l04, erase_lhf00l04, write_lhf00l04, NULL},
+ {"S29C51002T", SM_ID, S29C51002T, NULL, 256, 128,
+ probe_jedec, erase_chip_jedec, write_49f002, NULL},
{NULL,}
};
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