[U-Boot] [PATCH v6 1/3] i.MX6: nand: add nandbcb command for imx

[sbabic at denx.de]

> Writing/updating boot image in nand device is not
> straight forward in i.MX6 platform and it requires
> boot control block(BCB) to be configured.
> It becomes difficult to use uboot 'nand' command to
> write BCB since it requires platform specific attributes
> need to be taken care of.
> It is even difficult to use existing msx-nand.c driver by
> incorporating BCB attributes like mxs_dma_desc does
> because it requires change in mtd and nand command.
> So, cmd_nandbcb implemented in arch/arm/mach-imx
> BCB contains two data structures, Firmware Configuration Block(FCB)
> and Discovered Bad Block Table(DBBT). FCB has nand timings,
> DBBT search area, page address of firmware.
> On summary, nandbcb update will
> - erase the entire partition
> - create BCB by creating 2 FCB/DBBT block followed by
>   1 FW block based on partition size and erasesize.
> - fill FCB/DBBT structures
> - write FW/SPL on FW1
> - write FCB/DBBT in first 2 blocks
> for nand boot, up on reset bootrom look for FCB structure in
> first block's if FCB found the nand timings are loaded for
> further reads. once FCB read done, DTTB will load and finally
> firmware will be loaded which is boot image.
> Refer section "NAND Boot" from doc/imx/common/imx6.txt for more usage
> information.
> Reviewed-by: Stefano Babic <sbabic at denx.de>
> Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
> Signed-off-by: Sergey Kubushyn <ksi at koi8.net>
> Signed-off-by: Shyam Saini <shyam.saini at amarulasolutions.com>

Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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