[PATCH v2 1/3] mtd: rawnand: nand_base: support for 'NAND_IS_BOOT_MEDIUM' flag

[Michael Nazzareno Trimarchi]

Hi

On Mon, Aug 26, 2024 at 8:17 AM Arseniy Krasnov
<avkrasnov at salutedevices.com> 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 <avkrasnov at salutedevices.com>
> ---
>  Changelog:
>  v1 -> v2:
>   * Place 'NAND_IS_BOOT_MEDIUM' according its numerical value.
>
>  drivers/mtd/nand/raw/nand_base.c | 3 +++
>  include/linux/mtd/rawnand.h      | 5 +++++
>  2 files changed, 8 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..61690e816f 100644
> --- a/include/linux/mtd/rawnand.h
> +++ b/include/linux/mtd/rawnand.h
> @@ -248,6 +248,11 @@ enum nand_ecc_algo {
>   * kmap'ed, vmalloc'ed highmem buffers being passed from upper layers
>   */
>  #define NAND_USE_BOUNCE_BUFFER 0x00100000
> +/*
> + * 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 set by nand scan */
>  /* bbt has already been read */
> --

I will then backport this from linux kernel
dd6ed5c9890b759ba1b56697b9f3f50e71909e43

Reviewed-by: Michael Trimarchi <michael at amarulasolutions.com>

> 2.30.1
>



--
Michael Nazzareno Trimarchi
Co-Founder & Chief Executive Officer
M. +39 347 913 2170
michael at amarulasolutions.com
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