Re: [PATCH v1 1/3] mtd: rawnand: nand_base: support for 'NAND_IS_BOOT_MEDIUM' flag
Arseniy Krasnov <[email protected]>
| Newsgroups | io.groups.u-boot-amlogic,org.u-boot-project.lists.u-boot |
|---|---|
| Message-ID | <[email protected]> |
Hi, sorry, pls ping :)
Thanks
On 02.06.2024 23:08, Arseniy Krasnov wrote:
> Based on Linux kernel:
> commit f922bd798bb9 ("mtd: rawnand: add an option to specify NAND chip as a boot device")
>
> Allow to define a NAND chip as a boot device. This can be helpful
> for the selection of the ECC algorithm and strength in case the boot
> ROM supports only a subset of controller provided options.
>
> Signed-off-by: Arseniy Krasnov <[email protected]>
> ---
> drivers/mtd/nand/raw/nand_base.c | 3 +++
> include/linux/mtd/rawnand.h | 6 ++++++
> 2 files changed, 9 insertions(+)
>
> diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> index c40a0f23d7..ed605b4af5 100644
> --- a/drivers/mtd/nand/raw/nand_base.c
> +++ b/drivers/mtd/nand/raw/nand_base.c
> @@ -4458,6 +4458,9 @@ static int nand_dt_init(struct mtd_info *mtd, struct nand_chip *chip, ofnode nod
> if (ret == 16)
> chip->options |= NAND_BUSWIDTH_16;
>
> + if (ofnode_read_bool(node, "nand-is-boot-medium"))
> + chip->options |= NAND_IS_BOOT_MEDIUM;
> +
> if (ofnode_read_bool(node, "nand-on-flash-bbt"))
> chip->bbt_options |= NAND_BBT_USE_FLASH;
>
> diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
> index fb002ae641..4eb880d8fb 100644
> --- a/include/linux/mtd/rawnand.h
> +++ b/include/linux/mtd/rawnand.h
> @@ -218,6 +218,12 @@ enum nand_ecc_algo {
> /* Device needs 3rd row address cycle */
> #define NAND_ROW_ADDR_3 0x00004000
>
> +/*
> + * Whether the NAND chip is a boot medium. Drivers might use this information
> + * to select ECC algorithms supported by the boot ROM or similar restrictions.
> + */
> +#define NAND_IS_BOOT_MEDIUM 0x00400000
> +
> /* Options valid for Samsung large page devices */
> #define NAND_SAMSUNG_LP_OPTIONS NAND_CACHEPRG
>