SST25VF040B using 0x90 identification and AAI write
SST AAI is Auto Address Increment writing, a streamed write to the flash chip
where the first write command sets a starting address and following commands
simply append data. Unfortunately not supported by Winbond SPI masters.
From July 2008.
Corresponding to flashrom svn r407 and coreboot v2 svn r3913.
Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Peter Stuge <peter@stuge.se>
diff --git a/flash.h b/flash.h
index 0099b14..c74bacb 100644
--- a/flash.h
+++ b/flash.h
@@ -523,6 +523,7 @@
int spi_disable_blockprotect(void);
void spi_byte_program(int address, uint8_t byte);
int spi_nbyte_read(int address, uint8_t *bytes, int len);
+int spi_aai_write(struct flashchip *flash, uint8_t *buf);
/* 82802ab.c */
int probe_82802ab(struct flashchip *flash);
diff --git a/flashchips.c b/flashchips.c
index ecadf55..950ce63 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -1128,6 +1128,20 @@
{
.vendor = "SST",
+ .name = "SST25VF040B.REMS",
+ .manufacture_id = 0xbf,
+ .model_id = 0x8d,
+ .total_size = 512,
+ .page_size = 64*1024,
+ .tested = TEST_OK_PR,
+ .probe = probe_spi_rems,
+ .erase = spi_chip_erase_c7,
+ .write = spi_chip_aai_write,
+ .read = spi_chip_read,
+ },
+
+ {
+ .vendor = "SST",
.name = "SST25VF080B",
.manufacture_id = SST_ID,
.model_id = SST_25VF080B,
diff --git a/spi.c b/spi.c
index 756fbe5..57f4b13 100644
--- a/spi.c
+++ b/spi.c
@@ -615,3 +615,29 @@
return 1;
}
+
+int spi_aai_write(struct flashchip *flash, uint8_t *buf) {
+ uint32_t pos = 2, size = flash->total_size * 1024;
+ unsigned char w[6] = {0xad, 0, 0, 0, buf[0], buf[1]};
+ switch (flashbus) {
+ case BUS_TYPE_WBSIO_SPI:
+ fprintf(stderr, "%s: impossible with Winbond SPI masters, degrading to byte program\n", __func__);
+ return spi_chip_write(flash, buf);
+ default:
+ break;
+ }
+ flash->erase(flash);
+ spi_write_enable();
+ spi_command(6, 0, w, NULL);
+ while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
+ myusec_delay(5); /* SST25VF040B Tbp is max 10us */
+ while (pos < size) {
+ w[1] = buf[pos++];
+ w[2] = buf[pos++];
+ spi_command(3, 0, w, NULL);
+ while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
+ myusec_delay(5); /* SST25VF040B Tbp is max 10us */
+ }
+ spi_write_disable();
+ return 0;
+}