imx: mx6ul: support mx6ul 9x9 evk board

This patch is to support mx6ul_9x9_evk board based on mx6ul_14x14_evk,
the difference between mx6ul 9x9 evk and mx6ul 14x14 evk are:
1. mx6ul 9x9 evk use pfuze3000, while mx6ul 14x14 evk use DCDC.
2. mx6ul 9x9 evk supports 256MB LPDDR2, while mx6ul 14x14 evk
   supports 512MB DDR3
3. mx6ul_9x9_evk use 9x9 package, while mx6ul_14x14_evk use 14x14 package.

This patch add the following:
1. Discard PHYS_SDRAM_SIZE from header file, use imx_ddr_size()
2. Introduce a macro is_mx6ul_9x9_evk using
   CONFIG_IS_ENABLED(TARGET_MX6UL_9X9_EVK) to avoid "#ifdef xxx" in non-SPL
   part. To SPL part, CONFIG_IS_ENABLED(TARGET_MX6UL_9X9_EVK) can not work,
   so still use "#ifdef CONFIG_TARGET_MX6UL_9X9_EVK" to differentiate with
   mx6ul_14x14_evk. And we have no way to dymaically checking this chip
   is 9x9 or 14x14.
3. mx6ul_9x9_evk use pfuze3000, so enabled POWER related configurations.
   POWER related configurations also effect for mx6ul_14x14_evk. But
   power_init_board implementation using 'if (is_mx6ul_9x9_evk())' to
   do initialization for mx6ul_9x9_evk, and do nothing for mx6ul_14x14_evk.
4. mx6ul_9x9_evk use lpddr2 with size 256MB, so add related SPL DRAM
   configurations.
5. Enable CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG and setting dtb file
   according to board_rev and board_name.
6. Add TARGET_MX6UL_9X9_EVK Kconfig entry

Boot Log:
U-Boot SPL 2015.10-rc2-00356-g536ce34 (Sep 06 2015 - 12:22:53)
reading u-boot.img
reading u-boot.img

U-Boot 2015.10-rc2-00356-g536ce34 (Sep 06 2015 - 12:22:53 +0800)

CPU:   Freescale i.MX6UL rev1.0 792 MHz (running at 396 MHz)
CPU:   Commercial temperature grade (0C to 95C) at 41C
Reset cause: POR
Board: MX6UL 9x9 EVK
I2C:   ready
DRAM:  256 MiB
PMIC: PFUZE3000 DEV_ID=0x30 REV_ID=0x11
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
In:    serial
Out:   serial
Err:   serial
Net:   FEC1
Hit any key to stop autoboot:  0

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>

1 files changed, 22 insertions, 4 deletions

diff --git a/include/configs/mx6ul_14x14_evk.h b/include/configs/mx6ul_14x14_evk.h
index 670b1c2..a5c13f7 100644
--- a/include/configs/mx6ul_14x14_evk.h
+++ b/include/configs/mx6ul_14x14_evk.h
@@ -14,12 +14,16 @@
 #include "mx6_common.h"
 #include <asm/imx-common/gpio.h>
 
+#define is_mx6ul_9x9_evk()	CONFIG_IS_ENABLED(TARGET_MX6UL_9X9_EVK)
+
 /* SPL options */
 #define CONFIG_SPL_LIBCOMMON_SUPPORT
 #define CONFIG_SPL_MMC_SUPPORT
 #define CONFIG_SPL_FAT_SUPPORT
 #include "imx6_spl.h"
 
+#define CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+
 #define CONFIG_ROM_UNIFIED_SECTIONS
 #define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_DISPLAY_CPUINFO
@@ -61,9 +65,13 @@
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
 #define CONFIG_SYS_I2C_SPEED		100000
-#endif
 
-#define PHYS_SDRAM_SIZE			SZ_512M
+/* PMIC only for 9X9 EVK */
+#define CONFIG_POWER
+#define CONFIG_POWER_I2C
+#define CONFIG_POWER_PFUZE3000
+#define CONFIG_POWER_PFUZE3000_I2C_ADDR  0x08
+#endif
 
 #undef CONFIG_CMD_IMLS
 
@@ -75,7 +83,7 @@
 	"console=ttymxc0\0" \
 	"fdt_high=0xffffffff\0" \
 	"initrd_high=0xffffffff\0" \
-	"fdt_file=imx6ul-14x14-evk.dtb\0" \
+	"fdt_file=undefined\0" \
 	"fdt_addr=0x83000000\0" \
 	"boot_fdt=try\0" \
 	"ip_dyn=yes\0" \
@@ -129,9 +137,19 @@
 			"fi; " \
 		"else " \
 			"bootz; " \
-		"fi;\0"
+		"fi;\0" \
+		"findfdt="\
+			"if test $fdt_file = undefined; then " \
+				"if test $board_name = EVK && test $board_rev = 9X9; then " \
+					"setenv fdt_file imx6ul-9x9-evk.dtb; fi; " \
+				"if test $board_name = EVK && test $board_rev = 14X14; then " \
+					"setenv fdt_file imx6ul-14x14-evk.dtb; fi; " \
+				"if test $fdt_file = undefined; then " \
+					"echo WARNING: Could not determine dtb to use; fi; " \
+			"fi;\0" \
 
 #define CONFIG_BOOTCOMMAND \
+	   "run findfdt;" \
 	   "mmc dev ${mmcdev};" \
 	   "mmc dev ${mmcdev}; if mmc rescan; then " \
 		   "if run loadbootscript; then " \