tree fe83486e8c304c7f946f045f68fb1d1e6697c49f
parent 66bd1846ef08412c5c850b8a672d6fdc0eab539a
author Fabio Estevam <fabio.estevam@freescale.com> 1365672935 +0000
committer Albert ARIBAUD <albert.u.boot@aribaud.net> 1365746103 +0200

mtd: nand: mxc_nand: Fix is_16bit_nand()

Currently is_16bit_nand() is a per SoC function and it decides the bus nand
width by reading some boot related registers.

This method works when NAND is the boot medium, but does not work if another
boot medium is used. For example: booting from a SD card and then using NAND
to store the environment variables, would lead to the following error:

NAND bus width 16 instead 8 bit
No NAND device found!!!
0 MiB

Use CONFIG_SYS_NAND_BUSWIDTH_16BIT symbol to decide the bus width.

If it is defined in the board file, then consider 16-bit NAND bus-width,
otherwise assume 8-bit NAND is used.

This also aligns with Documentation/devicetree/bindings/mtd/nand.txt, which
states:

nand-bus-width : 8 or 16 bus width if not present 8

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Reviewed-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>