Added U-Boot SPI image instruction

docs/files/software/u-boot-armbian-boot-script-support.patch

@@ -0,0 +1,96 @@
+diff --git a/board/mv_ebu/a38x/mv_main_a38x.c b/board/mv_ebu/a38x/mv_main_a38x.c
+index 0dce7f6..ecf60ec 100755
+--- a/board/mv_ebu/a38x/mv_main_a38x.c
++++ b/board/mv_ebu/a38x/mv_main_a38x.c
+@@ -331,6 +331,10 @@ void misc_init_r_env(void)
+ 	if (!env)
+ 		setenv("console", "console=ttyS0,115200");
+ 
++	env = getenv("fdtfile");
++	if (!env)
++		setenv("fdtfile", "armada-388-helios4.dtb");
++
+ 	env = getenv("mtdids");
+ 	if (!env) {
+ #if defined(MV_NAND) && defined(MV_INCLUDE_SPI)
+@@ -679,25 +683,28 @@ void misc_init_r_env(void)
+ 		setenv("enaLPAE", "no");
+ #endif
+ 
+-	/* Flatten Device Tree environment setup */
+-#ifdef CONFIG_CUSTOMER_BOARD_SUPPORT
+-	#ifdef CONFIG_ARMADA_38X
+-		fdt_env_setup("armada-38x.dtb", MV_FALSE); /* static setup: Skip DT update for customer */
+-	#else
+-		fdt_env_setup("armada-39x.dtb", MV_FALSE);
+-	#endif
+-#else
+-	#ifdef CONFIG_ARMADA_38X
+-		fdt_env_setup("armada-38x-modular.dtb", MV_TRUE); /* dynamic setup: run DT update */
+-	#else
+-		fdt_env_setup("armada-39x.dtb", MV_FALSE); /* static setup: Skip DT update */
+-	#endif
+-#endif
++	setenv("fdt_skip_update", "yes");
++	setenv("boot_a_script",
++		"for prefix in /boot/ /; do \
++		load ${boot_interface} 0:1 ${script_addr_r} ${prefix}boot.scr && \
++		source ${script_addr_r}; \
++		done");
++	setenv("mmcboot",
++		"setenv boot_interface mmc; run boot_a_script;");
++	setenv("sataboot",
++		"scsi init; setenv boot_interface scsi; run boot_a_script;");
++	setenv("usbboot",
++		"setenv usbActive 1; setenv usbType 3; usb start; setenv boot_interface usb; run boot_a_script;");
+ 
+ #if (CONFIG_BOOTDELAY >= 0)
+ 	env = getenv("bootcmd");
+ 	if (!env)
+-		setenv("bootcmd", "tftpboot 0x2000000 $image_name;tftpboot $fdtaddr $fdtfile;"
++		setenv("bootcmd",
++		"echo Trying to boot from MMC; run mmcboot;"
++		"echo Trying to boot from SATA; run sataboot;"
++		"echo Trying to boot from USB; run usbboot;"
++		"echo Default boot sequence failed - falling back to TFTP;"
++		"tftpboot 0x2000000 $image_name;tftpboot $fdtaddr $fdtfile;"
+ 		"setenv bootargs $console $nandEcc $mtdparts $bootargs_root nfsroot=$serverip:$rootpath "
+ 		"ip=$ipaddr:$serverip$bootargs_end $mvNetConfig video=dovefb:lcd0:$lcd0_params "
+ 		"clcd.lcd0_enable=$lcd0_enable clcd.lcd_panel=$lcd_panel; bootz 0x2000000 - $fdtaddr;");
+diff --git a/common/cmd_fs.c b/common/cmd_fs.c
+index a681d03..9cc5013 100644
+--- a/common/cmd_fs.c
++++ b/common/cmd_fs.c
+@@ -22,7 +22,7 @@
+ 
+ int do_load_wrapper(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+ {
+-	return do_load(cmdtp, flag, argc, argv, FS_TYPE_ANY, 0);
++	return do_load(cmdtp, flag, argc, argv, FS_TYPE_ANY, 16);
+ }
+ 
+ U_BOOT_CMD(
+diff --git a/include/configs/armada_38x.h b/include/configs/armada_38x.h
+index c57353f..746c843 100644
+--- a/include/configs/armada_38x.h
++++ b/include/configs/armada_38x.h
+@@ -164,7 +164,7 @@ extern unsigned int mvUartPortGet(void);
+ #define CONFIG_CMD_RCVR
+ #define CONFIG_CMD_BOOT_MENU
+ #define CONFIG_CMD_SYS_RESTORE
+-
++#define CONFIG_CMD_FS_GENERIC
+ 
+ /* Open this define for enabling Secure Boot Mode eFuses modification
+ #define CONFIG_CMD_EFUSE
+@@ -207,7 +207,6 @@ extern unsigned int mvUartPortGet(void);
+ #define CONFIG_FS_EXT4
+ #define CONFIG_CMD_EXT4_WRITE
+ #define CONFIG_EXT4_WRITE
+-#define CONFIG_CMD_JFFS2
+ #define CONFIG_CMD_FAT
+ #define CONFIG_FS_FAT
+ #define CONFIG_SUPPORT_VFAT
+-- 
+2.7.4
+

docs/uboot.md

@@ -8,6 +8,9 @@ sudo apt-get install gcc make gcc-arm-linux-gnueabi binutils-arm-linux-gnueabi
 
 Other option, use Linaro cross compiler 4.9.4 arm-gnueabi toolchain. Download [here](https://releases.linaro.org/components/toolchain/binaries/4.9-2017.01/arm-linux-gnueabi/).
 
+!!! Note
+	DO NOT use hard-float variant (arm-linux-gnueabihf).
+
 ## Compile U Boot
 
 ```bash
@@ -20,12 +23,28 @@ export CROSS_COMPILE="/path/to/cross/compiler"
 export CROSS_COMPILE_BH=${CROSS_COMPILE}
 
 make mrproper
-
-./build.pl -f mmc -b armada_38x_helios4
 ```
 
 !!! note
     To compile using Ubuntu 16.04 cross compiler, please apply [this patch](https://github.com/armbian/build/blob/master/patch/u-boot/u-boot-mvebu/tools-bin_hdr-compiler-fixes.patch) to U-Boot source code.
 
-!!! note
+    To support Armbian boot script, please apply [this patch](/files/software/u-boot-armbian-boot-script-support.patch) to U-Boot source code.
-    If failed to compile using Linaro cross compiler 4.9.4 arm-gnueabihf (error about hard float VFP), use **soft-float compiler**
+
+
+### SD Card image
+
+```
+./build.pl -f mmc -b armada_38x_helios4
+```
+
+it would produced *u-boot-a38x-**mm**-**d**-mmc.bin* whereas **mm** is month and **d** is day. For example, building u-boot on October 2nd would produced
+*u-boot-a38x-10-2-mmc.bin*
+
+### SPI NOR flash image
+
+```
+./build.pl -f spi -b armada_38x_helios4
+```
+
+it would produced *u-boot-a38x-**mm**-**d**-spi.bin* whereas **mm** is month and **d** is day. For example, building u-boot on October 2nd would produced
+*u-boot-a38x-10-2-spi.bin*