Some of the newer MLC devices have a 6-byte ID sequence in which
several field definitions differ from older chips in a manner that is
not backward compatible. For instance:
Samsung K9GAG08U0M (5-byte sequence): ec d5 14 b6 74
4th byte, bits 1:0 encode the page size: 0=1KiB, 1=2KiB, 2=4KiB, 3=8KiB
4th byte, bits 5:4 encode the block size: 0=64KiB, 1=128KiB, ...
4th byte, bit 6 encodes the OOB size: 0=8B/512B, 1=16B/512B
Samsung K9GAG08U0D (6-byte sequence): ec d5 94 29 34 41
4th byte, bits 1:0 encode the page size: 0=2KiB, 1=4KiB, 3=8KiB, 4=rsvd
4th byte, bits 7;5:4 encode the block size: 0=128KiB, 1=256KiB, ...
4th byte, bits 6;3:2 encode the OOB size: 1=128B/page, 2=218B/page
This patch uses the new 6-byte scheme if the ID code wraps around
exactly at byte 6, and falls back to the old scheme otherwise.
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
---
drivers/mtd/nand/nand_base.c | 60 ++++++++++++++++++++++++++++--------------
1 files changed, 40 insertions(+), 20 deletions(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index b9dc65c..2537ceb 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2774,8 +2774,8 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
int busw, int *maf_id,
struct nand_flash_dev *type)
{
- int dev_id, maf_idx;
- int tmp_id, tmp_manf;
+ int dev_id, maf_idx, i;
+ u8 id_data[8];
/* Select the device */
chip->select_chip(mtd, 0);
@@ -2801,15 +2801,15 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
- /* Read manufacturer and device IDs */
+ /* Read entire ID string */
- tmp_manf = chip->read_byte(mtd);
- tmp_id = chip->read_byte(mtd);
+ for (i = 0; i < 8; i++)
+ id_data[i] = chip->read_byte(mtd);
- if (tmp_manf != *maf_id || tmp_id != dev_id) {
+ if (id_data[0] != *maf_id || id_data[1] != dev_id) {
printk(KERN_INFO "%s: second ID ...
