[PATCH v1 1/3] mtd: rawnand: nand_base: support for 'NAND_IS_BOOT_MEDIUM' flag
Alexander Dahl
ada at thorsis.com
Mon Jun 24 11:14:55 CEST 2024
Hello Arseniy,
Am Sun, Jun 02, 2024 at 11:08:34PM +0300 schrieb Arseniy Krasnov:
> 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 <avkrasnov at salutedevices.com>
> ---
> 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
The entries in that file are ordered numerically. Comparing with the
same file in Linux this should go before NAND_KEEP_TIMINGS, not
anywhere in between. Makes later diffs and ports from Linux easier.
Greets
Alex
>
> --
> 2.35.0
>
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