k2hk_evm: add script to automate NAND flash process

Add script to automate NAND flash process. As for now the board has
two burn scripts - burn to boot from SPI NOR flash and burn to boot
from AEMIF NAND flash, rename burn_uboot script to burn_uboot_spi.
Also update README to contain NAND burn U-boot process description.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>
Acked-by: Murali Karicheri <m-karicheri2@ti.com>

board/ti/k2hk_evm/README

@@ -38,11 +38,13 @@ board configuration file: include/configs/k2hk_evm.h
 
 Supported boot modes:
  - SPI NOR boot
+ - AEMIF NAND boot
 
 Supported image formats:-
  - u-boot.bin: for loading and running u-boot.bin through Texas instruments
                code composure studio (CCS)
  - u-boot-spi.gph: gpimage for programming SPI NOR flash for SPI NOR boot
+ - u-boot-nand.gph: gpimage for programming AEMIF NAND flash for NAND boot
 
 Build instructions:
 ===================
@@ -55,6 +57,10 @@ To build u-boot-spi.gph
   >make k2hk_evm_config
   >make u-boot-spi.gph
 
+To build u-boot-nand.gph
+  >make k2hk_evm_config
+  >make u-boot-nand.gph
+
 Load and Run U-Boot on K2HK EVM using CCS
 =========================================
 
@@ -115,8 +121,28 @@ instructions:-
 5. At the U-Boot console type following to setup u-boot environment variables.
    setenv addr_uboot 0x87000000
    setenv filesize <size in hex of u-boot-spi.gph rounded to hex 0x10000>
-   run burn_uboot
+   run burn_uboot_spi
    Once u-boot prompt is available, Power OFF the EVM. Set the SW1 dip switch
    to "SPI Little Endian Boot mode" as per instruction at
    http://processors.wiki.ti.com/index.php/EVMK2H_Hardware_Setup.
 6. Power ON the EVM. The EVM now boots with u-boot image on the NOR flash.
+
+AEMIF NAND Flash programming instructions
+======================================
+U-Boot image can be flashed to first 1024KB of the NAND flash using following
+instructions:-
+
+1. Start CCS and run U-boot as described above.
+2. Suspend Target. Select Run -> Suspend from top level menu
+   CortexA15_1 (Free Running)"
+3. Load u-boot-nand.gph binary from build folder on to DDR address 0x87000000
+   through CCS as described in step 2 of "Load and Run U-Boot on K2HK EVM
+   using CCS", but using address 0x87000000.
+4. Free Run the target as desribed earlier (step 4) to get u-boot prompt
+5. At the U-Boot console type following to setup u-boot environment variables.
+   setenv filesize <size in hex of u-boot-nand.gph rounded to hex 0x10000>
+   run burn_uboot_nand
+   Once u-boot prompt is available, Power OFF the EVM. Set the SW1 dip switch
+   to "ARM NAND Boot mode" as per instruction at
+   http://processors.wiki.ti.com/index.php/EVMK2H_Hardware_Setup.
+6. Power ON the EVM. The EVM now boots with u-boot image on the NAND flash.

include/configs/k2hk_evm.h

@@ -221,8 +221,10 @@
 	"get_mon_net=dhcp ${addr_mon} ${tftp_root}/${name_mon}\0"	\
 	"get_mon_ubi=ubifsload ${addr_mon} ${name_mon}\0"		\
 	"get_uboot_net=dhcp ${addr_uboot} ${tftp_root}/${name_uboot}\0"	\
-	"burn_uboot=sf probe; sf erase 0 0x100000; "			\
+	"burn_uboot_spi=sf probe; sf erase 0 0x100000; "		\
 		"sf write ${addr_uboot} 0 ${filesize}\0"		\
+	"burn_uboot_nand=nand erase 0 0x100000; "			\
+		"nand write ${addr_uboot} 0 ${filesize}\0"		\
 	"args_all=setenv bootargs console=ttyS0,115200n8 rootwait=1\0"	\
 	"args_ubi=setenv bootargs ${bootargs} rootfstype=ubifs "	\
 		"root=ubi0:rootfs rootflags=sync rw ubi.mtd=2,2048\0"	\