path: root/w29ee011.c
diff options
authorJens Kuehnel <>2008-06-18 13:36:34 +0000
committerPeter Stuge <>2008-06-18 13:36:34 +0000
commitb9f617448d532f6b7c1946e722d2d17e5de978b8 (patch)
tree7c608125c09acbc42651b87b32f22749206c8345 /w29ee011.c
parent7ffbc6f94d50cdc584913c4f02709ae660664a75 (diff)
Add support for AMIC Technology A49LF040A and do not probe W29EE011 anymore
Jens sent the first patch that added A49LF040A to flash.h and flashchips.c using _jedec and _49lf040 functions. An issue was found with probe_w29ee011() for the Winbond W29EE011, which caused the A49LF040A to no longer respond to any commands. Ward made a patch to disable probing by default for the W29EE011 following some discussion. Using -c W29EE011 will make flashrom probe for the chip. Peter did some more datasheet diving and found that the Pm49FL00x functions suited this chip quite well because of the block locking registers in A49LF040A, and finally tested PROBE READ ERASE WRITE to work on ALIX.3c3. Ward confirmed that this works on alix.2c3 too. Corresponding to flashrom svn r260 and coreboot v2 svn r3368. Signed-off-by: Jens Kuehnel <> Signed-off-by: Ward Vandewege <> Signed-off-by: Peter Stuge <> Acked-by: Ward Vandewege <>
Diffstat (limited to 'w29ee011.c')
1 files changed, 11 insertions, 0 deletions
diff --git a/w29ee011.c b/w29ee011.c
index 88a7a8a..3af5be2 100644
--- a/w29ee011.c
+++ b/w29ee011.c
@@ -18,12 +18,23 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+#include <string.h>
#include "flash.h"
int probe_w29ee011(struct flashchip *flash)
volatile uint8_t *bios = flash->virtual_memory;
uint8_t id1, id2;
+ extern char *chip_to_probe;
+ if (!chip_to_probe || strcmp(chip_to_probe,"W29EE011")) {
+ printf_debug("\n===\n");
+ printf_debug(" Probing disabled for Winbond W29EE011 because the probing sequence puts the\n");
+ printf_debug(" AMIC A49LF040A in a funky state.\n");
+ printf_debug(" Use 'flashrom -c W29EE011' if you have a board with this chip.");
+ printf_debug("\n===\n");
+ return 0;
+ }
/* Issue JEDEC Product ID Entry command */
*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
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