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--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -48,6 +48,12 @@
#define SST49LF008A 0x005a
#define AT49BV6416 0x00d6
+/* Macronix */
+#define MX29LV160B 0x2249 /* MX29LV160 Bottom-boot chip */
+#define MX29LV160T 0x22C4 /* MX29LV160 Top-boot chip */
+#define MX29LV320B 0x22A8 /* MX29LV320 Bottom-boot chip */
+#define MX29LV320T 0x22A7 /* MX29LV320 Top-boot chip */
+
static int cfi_amdstd_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_amdstd_write_words(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static int cfi_amdstd_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
@@ -342,6 +348,41 @@ static struct cfi_fixup cfi_nopri_fixup_
{ 0, 0, NULL }
};
+#ifdef CONFIG_MTD_CFI_FIXUP_MACRONIX_BOOTLOC
+/*
+ * Some Macronix chips has no/bad bootblock information in the CFI table
+ */
+static void fixup_macronix_bootloc(struct mtd_info *mtd, void* param)
+{
+ struct map_info *map = mtd->priv;
+ struct cfi_private *cfi = map->fldrv_priv;
+ struct cfi_pri_amdstd *extp = cfi->cmdset_priv;
+ __u8 t;
+
+ switch (cfi->id) {
+ /* TODO: put affected chip ids here */
+ case MX29LV160B:
+ case MX29LV320B:
+ t = 2; /* Bottom boot */
+ break;
+ case MX29LV160T:
+ case MX29LV320T:
+ t = 3; /* Top boot */
+ break;
+ default:
+ return;
+ }
+
+ if (extp->TopBottom == t)
+ /* boot location detected by the CFI layer is correct */
+ return;
+
+ extp->TopBottom = t;
+ printk("%s: Macronix chip detected, id:0x%04X, boot location forced "
+ "to %s\n", map->name, cfi->id, (t == 2) ? "bottom" : "top");
+}
+#endif /* CONFIG_MTD_CFI_FIXUP_MACRONIX_BOOTLOC */
+
static struct cfi_fixup cfi_fixup_table[] = {
{ CFI_MFR_ATMEL, CFI_ID_ANY, fixup_convert_atmel_pri },
#ifdef AMD_BOOTLOC_BUG
@@ -383,6 +424,9 @@ static struct cfi_fixup fixup_table[] =
*/
{ CFI_MFR_ANY, CFI_ID_ANY, fixup_use_erase_chip },
{ CFI_MFR_ATMEL, AT49BV6416, fixup_use_atmel_lock },
+#ifdef CONFIG_MTD_CFI_FIXUP_MACRONIX_BOOTLOC
+ { CFI_MFR_MACRONIX, CFI_ID_ANY, fixup_macronix_bootloc, NULL, },
+#endif
{ 0, 0, NULL }
};
--- a/drivers/mtd/chips/Kconfig
+++ b/drivers/mtd/chips/Kconfig
@@ -196,6 +196,14 @@ config MTD_CFI_AMDSTD
provides support for one of those command sets, used on chips
including the AMD Am29LV320.
+config MTD_CFI_FIXUP_MACRONIX_BOOTLOC
+ bool "Fix boot-block location for Macronix flash chips"
+ depends on MTD_CFI_AMDSTD
+ help
+ Some Macronix flash chips have no/wrong boot-block location in the
+ CFI table, and the driver may detect the type incorrectly. Select
+ this if your board has such chip.
+
config MTD_CFI_STAA
tristate "Support for ST (Advanced Architecture) flash chips"
depends on MTD_GEN_PROBE
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