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mtd: rawnand: nand_base: support for 'NAND_IS_BOOT_MEDIUM' flag

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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@salutedevices.com>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
Link: https://lore.kernel.org/r/20240826131710.29746-2-avkrasnov@salutedevices.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
This commit is contained in:
Arseniy Krasnov
2024-08-26 16:17:08 +03:00
committed by Neil Armstrong
parent ee2af844ba
commit 9905e77eda
2 changed files with 8 additions and 0 deletions
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3
drivers/mtd/nand/raw/nand_base.c
View File

@@ -4454,6 +4454,9 @@ 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;

5
include/linux/mtd/rawnand.h
View File

@@ -247,6 +247,11 @@ 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
/*
* Do not try to tweak the timings at runtime. This is needed when the