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mtd: nand: raw: allow to disable unneeded ECC layouts 

Each ECC layout consumes about 2984 bytes in the .data section. Allow
to disable the default ECC layouts if a driver is known to provide its
own ECC layout.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Stefan Agner 2018-12-06 14:57:09 +01:00 committed by Tom Rini
parent aac0c29d4b
commit a38c3af868
2 changed files with 11 additions and 0 deletions
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7
drivers/mtd/nand/raw/Kconfig
View File

@ -9,6 +9,12 @@ config SYS_NAND_SELF_INIT
This option, if enabled, provides more flexible and linux-like
NAND initialization process.
config SYS_NAND_DRIVER_ECC_LAYOUT
bool
help
Omit standard ECC layouts to safe space. Select this if your driver
is known to provide its own ECC layout.
config NAND_ATMEL
bool "Support Atmel NAND controller"
imply SYS_NAND_USE_FLASH_BBT
@ -81,6 +87,7 @@ config NAND_OMAP_ELM
config NAND_VF610_NFC
bool "Support for Freescale NFC for VF610"
select SYS_NAND_SELF_INIT
select SYS_NAND_DRIVER_ECC_LAYOUT
imply CMD_NAND
help
Enables support for NAND Flash Controller on some Freescale

4
drivers/mtd/nand/raw/nand_base.c
View File

@ -47,6 +47,7 @@
#include <linux/errno.h>
/* Define default oob placement schemes for large and small page devices */
#ifdef CONFIG_SYS_NAND_DRIVER_ECC_LAYOUT
static struct nand_ecclayout nand_oob_8 = {
.eccbytes = 3,
.eccpos = {0, 1, 2},
@ -89,6 +90,7 @@ static struct nand_ecclayout nand_oob_128 = {
{.offset = 2,
.length = 78} }
};
#endif
static int nand_get_device(struct mtd_info *mtd, int new_state);
@ -4339,6 +4341,7 @@ int nand_scan_tail(struct mtd_info *mtd)
*/
if (!ecc->layout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
switch (mtd->oobsize) {
#ifdef CONFIG_SYS_NAND_DRIVER_ECC_LAYOUT
case 8:
ecc->layout = &nand_oob_8;
break;
@ -4351,6 +4354,7 @@ int nand_scan_tail(struct mtd_info *mtd)
case 128:
ecc->layout = &nand_oob_128;
break;
#endif
default:
pr_warn("No oob scheme defined for oobsize %d\n",
mtd->oobsize);