Dear all&Thomas,
There is a bug in the way to identify nand chips.
At the array nand_flash_ids[] of nand_ids.c, there is a line like that:
{"NAND 4MiB 3,3V 8-bit", 0xd5, 512, 4, 0x2000, 0},
There is another line like that:
{"NAND 2GiB 3,3V 8-bit", 0xD5, 0, 2048, 0, LP_OPTIONS},
Both Id is 0xd5.
So for those chip with chip id=0xd5, for example K9LAG08U0,it will be
identified as an old chip with page size=512 by the nand_get_flash_type()
in nand_base.c like:
/* Lookup the flash id */
for (i = 0; nand_flash_ids[i].name != NULL; i++) {
if (dev_id == nand_flash_ids[i].id) {
type = &nand_flash_ids[i];
break;
}
}
/* Newer devices have all the information in additional id bytes */
if (!type->pagesize) {
...
} else {
/*
* Old devices have chip data hardcoded in the device id
table
*/
mtd->erasesize = type->erasesize;
mtd->writesize = type->pagesize;
mtd->oobsize = mtd->writesize / 32;
busw = type->options & NAND_BUSWIDTH_16;
}
We should change the way to get page size, block size and so on. For the
beginning some chips in nand_flash_ids[], it is not always reliable for
us to get all information through only one ID byte.
Thanks
Barry Song
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