i.MX6: nand: add nandbcb command for imx
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@denx.de>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Sergey Kubushyn <ksi@koi8.net>
Signed-off-by: Shyam Saini <shyam.saini@amarulasolutions.com>
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index b6fd159..aeb5493 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -71,6 +71,17 @@
This enables the 'hdmidet' command which detects if an HDMI monitor
is connected.
+config CMD_NANDBCB
+ bool "i.MX6 NAND Boot Control Block(BCB) command"
+ depends on NAND && CMD_MTDPARTS
+ default y if ARCH_MX6 && NAND_MXS
+ help
+ Unlike normal 'nand write/erase' commands, this command update
+ Boot Control Block(BCB) for i.MX6 platform NAND IP's.
+
+ This is similar to kobs-ng, which is used in Linux as separate
+ rootfs package.
+
config NXP_BOARD_REVISION
bool "Read NXP board revision from fuses"
depends on ARCH_MX6 || ARCH_MX7