Hi,
after uboot update from 2022.07 to 2022.10 SAMSUNG NAND is not recognized correctly. I use device with SAMSUNG K9K8G08U0F flash which does not support ONFI and JEDEC. Both uboot versions read 8-byte id_data in the same way: 0xD3ECC65A9551D3EC. However 2022.07 recognized flash correctly as: nand_base: 1024 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64 1024 MiB The new 2022.10 recognized flash incorrectly: nand_base: 1024 MiB, SLC, erase size: 4096 KiB, page size: 4096, OOB size: 128 1024 MiB
This behavior is caused by not setting chip->bits_per_cell value which is in my case equal to zero. To fix the issue we need to set it before we enter to function nand_manufacturer_detect. Following patch do this:
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c index 4b09a11288..143d3cb755 100644 --- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -4375,6 +4375,8 @@ struct nand_flash_dev *nand_get_flash_type(struct nand_chip *chip, int *maf_id,
chip->chipsize = (uint64_t)type->chipsize << 20;
+ chip->bits_per_cell = nand_get_bits_per_cell(chip->id.data[2]); + if (!type->pagesize) { nand_manufacturer_detect(chip); } else {
BR, Marcin