From 80ef700f8df1f85dd3b0880584e2e2a998a9b3dd Mon Sep 17 00:00:00 2001 From: Boris Brezillon Date: Mon, 6 Jun 2016 10:16:58 +0200 Subject: [PATCH] spl: nand: support redundant u-boot image On modern NAND it's more than recommended to have a backup copy of the u-boot binary to recover from corruption: bitflips are quite common on MLC NANDs, and the read-disturbance will corrupt your u-boot partitition more quickly than what you would see on an SLC NAND. Add an extra Kconfig option to specify the offset of the redundant u-boot image. Signed-off-by: Boris Brezillon Acked-by: Hans de Goede [scottwood: added ifdef to fix build break] Signed-off-by: Scott Wood --- common/spl/spl_nand.c | 7 +++++++ drivers/mtd/nand/Kconfig | 8 ++++++++ 2 files changed, 15 insertions(+) diff --git a/common/spl/spl_nand.c b/common/spl/spl_nand.c index 7cf0d1b986..0e35e0fd6b 100644 --- a/common/spl/spl_nand.c +++ b/common/spl/spl_nand.c @@ -134,6 +134,13 @@ int spl_nand_load_image(void) #endif /* Load u-boot */ err = spl_nand_load_element(CONFIG_SYS_NAND_U_BOOT_OFFS, header); +#ifdef CONFIG_SYS_NAND_U_BOOT_OFFS_REDUND +#if CONFIG_SYS_NAND_U_BOOT_OFFS != CONFIG_SYS_NAND_U_BOOT_OFFS_REDUND + if (err) + err = spl_nand_load_element(CONFIG_SYS_NAND_U_BOOT_OFFS_REDUND, + header); +#endif +#endif nand_deselect(); return err; } diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig index 5fe169f6ce..8c46a2ff8e 100644 --- a/drivers/mtd/nand/Kconfig +++ b/drivers/mtd/nand/Kconfig @@ -117,6 +117,14 @@ config SYS_NAND_U_BOOT_OFFS Set the offset from the start of the nand where u-boot should be loaded from. +config SYS_NAND_U_BOOT_OFFS_REDUND + hex "Location in NAND to read U-Boot from" + default SYS_NAND_U_BOOT_OFFS + depends on SYS_NAND_U_BOOT_LOCATIONS + help + Set the offset from the start of the nand where the redundant u-boot + should be loaded from. + config SPL_NAND_DENALI bool "Support Denali NAND controller for SPL" help -- 2.39.5