arm: socfpga: DE0 use environment in common header

This removes the default environment from the de0 headers
and instead uses the common environment provided in
socfpga_common.h which now uses distro boot.

In addition to the above, add support to boot from the custom
a2 type partition

Signed-off-by: Dalon Westergreen <dwesterg@gmail.com>
Acked-by: Marek Vasut <marex@denx.de>

--
Changes in v2:
 - Remove unneeded CONFIG_BOOTFILE

configs/socfpga_de0_nano_soc_defconfig

@@ -4,6 +4,7 @@ CONFIG_SYS_MALLOC_F_LEN=0x2000
 CONFIG_TARGET_SOCFPGA_TERASIC_DE0_NANO=y
 CONFIG_SPL_STACK_R_ADDR=0x00800000
 CONFIG_DEFAULT_DEVICE_TREE="socfpga_cyclone5_de0_nano_soc"
+CONFIG_DEFAULT_FDT_FILE="socfpga_cyclone5_de0_nano_soc.dtb"
 CONFIG_FIT=y
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y
@@ -58,3 +59,5 @@ CONFIG_G_DNL_MANUFACTURER="terasic"
 CONFIG_G_DNL_VENDOR_NUM=0x0525
 CONFIG_G_DNL_PRODUCT_NUM=0xa4a5
 CONFIG_USE_TINY_PRINTF=y
+CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE=y
+CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_TYPE=0xa2

include/configs/socfpga_de0_nano_soc.h

@@ -16,9 +16,6 @@
 #define PHYS_SDRAM_1_SIZE		0x40000000	/* 1GiB */
 
 /* Booting Linux */
-#define CONFIG_BOOTFILE		"fitImage"
-#define CONFIG_BOOTARGS		"console=ttyS0," __stringify(CONFIG_BAUDRATE)
-#define CONFIG_BOOTCOMMAND	"run mmcload; run mmcboot"
 #define CONFIG_LOADADDR		0x01000000
 #define CONFIG_SYS_LOAD_ADDR	CONFIG_LOADADDR
 
@@ -30,23 +27,6 @@
 
 #define CONFIG_ENV_IS_IN_MMC
 
-/* Extra Environment */
-#define CONFIG_EXTRA_ENV_SETTINGS \
-	"loadaddr=" __stringify(CONFIG_SYS_LOAD_ADDR) "\0" \
-	"ramboot=setenv bootargs " CONFIG_BOOTARGS ";" \
-		"bootm ${loadaddr} - ${fdt_addr}\0" \
-	"bootimage=zImage\0" \
-	"fdt_addr=100\0" \
-	"fdtimage=socfpga.dtb\0" \
-	"bootm ${loadaddr} - ${fdt_addr}\0" \
-	"mmcroot=/dev/mmcblk0p2\0" \
-	"mmcboot=setenv bootargs " CONFIG_BOOTARGS \
-		" root=${mmcroot} rw rootwait;" \
-		"bootz ${loadaddr} - ${fdt_addr}\0" \
-	"mmcload=mmc rescan;" \
-		"load mmc 0:1 ${loadaddr} ${bootimage};" \
-		"load mmc 0:1 ${fdt_addr} ${fdtimage}\0" \
-
 /* The rest of the configuration is shared */
 #include <configs/socfpga_common.h>