flashrom: 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.

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3913 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

diff --git a/util/flashrom/flash.h b/util/flashrom/flash.h
index 0099b1484c5829624d393548d4d5d28dcf18d44b..c74bacb3996325ea7da15da9725a2cfb58a1aaf9 100644 (file)
--- a/util/flashrom/flash.h
+++ b/util/flashrom/flash.h
@@ -523,6 +523,7 @@ uint8_t spi_read_status_register();
 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/util/flashrom/flashchips.c b/util/flashrom/flashchips.c
index ecadf557b26aa0431399646b278a7969207c3286..950ce63ed1453e5aaa47fd83cc941a6d030d52bb 100644 (file)
--- a/util/flashrom/flashchips.c
+++ b/util/flashrom/flashchips.c
@@ -1126,6 +1126,20 @@ struct flashchip flashchips[] = {
                .read           = spi_chip_read,
        },
 
+       {
+               .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",

diff --git a/util/flashrom/spi.c b/util/flashrom/spi.c
index 756fbe5602a2e35fe03cb740f6d89cb54c3ba50c..57f4b133daae68089638d6e0e09b0d4ea3133593 100644 (file)
--- a/util/flashrom/spi.c
+++ b/util/flashrom/spi.c
@@ -615,3 +615,29 @@ int spi_chip_write(struct flashchip *flash, uint8_t *buf)
 
        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;
+}