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u-boot-brain/drivers/mtd/nand
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pekon gupta b80a660338 mtd: nand: omap: add CONFIG_SYS_NAND_BUSWIDTH_16BIT to indicate NAND device bus-width 
GPMC controller needs to be configured based on bus-width of the NAND device
connected to it. Also, dynamic detection of NAND bus-width from on-chip ONFI
parameters is not possible in following situations:
SPL:    SPL NAND drivers does not support ONFI parameter reading.
U-boot: GPMC controller iniitalization is done in omap_gpmc.c:board_nand_init()
        which is called before probing for devices, hence any ONFI parameter
        information is not available during GPMC initialization.

Thus, OMAP NAND driver expected board developers to explicitely write GPMC
configurations specific to NAND device attached on board in board files itself.
But this was troublesome for board manufacturers as they need to dive into
lengthy platform & SoC documents to find details of GPMC registers and
appropriate configurations to get NAND device working.

This patch instead adds existing CONFIG_SYS_NAND_BUSWIDTH_16BIT to board config
hich indicates that connected NAND device has x16 bus-width. And then based on
this config GPMC driver itself initializes itself based on NAND bus-width. This
keeps board developers free from knowing GPMC controller specific internals.

Signed-off-by: Pekon Gupta <pekon@ti.com>
2014-06-06 17:46:06 -04:00
..
am335x_spl_bch.c mtd: nand: force NAND_CMD_READID onto 8-bit bus 2014-06-06 17:46:03 -04:00
atmel_nand_ecc.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
atmel_nand.c mtd: nand: force NAND_CMD_READID onto 8-bit bus 2014-06-06 17:46:03 -04:00
bfin_nand.c mtd: resync with Linux-3.7.1 2013-05-31 17:12:03 -05:00
davinci_nand.c NAND: DaVinci: allow forced disable of subpage writes 2014-04-17 17:24:38 -04:00
docg4_spl.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
docg4.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
fsl_elbc_nand.c mtd/fsl_elbc: take NAND_ECC_SOFT_BCH config option into account 2013-10-24 09:36:05 -07:00
fsl_elbc_spl.c Coding Style cleanup: replace leading SPACEs by TABs 2013-10-14 16:06:54 -04:00
fsl_ifc_nand.c driver/ifc:Change accessor function to take care of endianness 2014-02-03 08:38:51 -08:00
fsl_ifc_spl.c driver/ifc: define nand_spl_load_image() for SPL 2014-04-22 17:58:50 -07:00
fsl_upm.c Coding Style cleanup: replace leading SPACEs by TABs 2013-10-14 16:06:54 -04:00
fsmc_nand.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
jz4740_nand.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
kb9202_nand.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
kirkwood_nand.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
kmeter1_nand.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
Makefile mtd: Build nand_util.o for CONFIG_ENV_IS_IN_NAND in SPL 2014-04-17 14:39:54 -04:00
mpc5121_nfc.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
mxc_nand_spl.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
mxc_nand.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
mxc_nand.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
mxs_nand.c mxs_nand: Fix ECC strength for NAND flash with OOB size of 224 2013-09-11 09:33:36 +02:00
nand_base.c mtd: nand: force NAND_CMD_READID onto 8-bit bus 2014-06-06 17:46:03 -04:00
nand_bbt.c mtd: resync with Linux-3.7.1 2013-05-31 17:12:03 -05:00
nand_bch.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
nand_ecc.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
nand_ids.c Coding Style cleanup: remove trailing empty lines 2013-10-14 16:06:54 -04:00
nand_plat.c mtd: nand_plat: add simple GPIO framework DEV_READY option 2010-07-08 16:52:12 -05:00
nand_spl_load.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
nand_spl_simple.c mtd: nand: force NAND_CMD_READID onto 8-bit bus 2014-06-06 17:46:03 -04:00
nand_util.c nand_util.c: Use '%zd' for length in nand_unlock debug print 2013-12-17 17:44:36 -06:00
nand.c nand: Introduce CONFIG_SYS_NAND_SELF_INIT 2012-01-26 16:09:06 -06:00
ndfc.c ppc4xx: Remove 4xx NAND booting support 2014-03-07 10:59:06 -05:00
nomadik.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
omap_elm.c mtd: nand: omap: fix error-codes returned from omap-elm driver 2014-06-06 17:46:00 -04:00
omap_gpmc.c mtd: nand: omap: add CONFIG_SYS_NAND_BUSWIDTH_16BIT to indicate NAND device bus-width 2014-06-06 17:46:06 -04:00
s3c2410_nand.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
tegra_nand.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
tegra_nand.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00