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>
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index fd1723f..ffc6cc9 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -9,6 +9,12 @@
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_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
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 92daebe..6d2ff58 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -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 @@
{.offset = 2,
.length = 78} }
};
+#endif
static int nand_get_device(struct mtd_info *mtd, int new_state);
@@ -4339,6 +4341,7 @@
*/
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 @@
case 128:
ecc->layout = &nand_oob_128;
break;
+#endif
default:
pr_warn("No oob scheme defined for oobsize %d\n",
mtd->oobsize);