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 <avkras...@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
--
2.35.0
