Added mainline U-Boot

docs/files/uboot/u-boot-mainline-armbian-boot-script-support.patch

@@ -0,0 +1,31 @@
+From f25165a2bcac2ec1b33b541a04ece0eef420674a Mon Sep 17 00:00:00 2001
+Message-Id: <f25165a2bcac2ec1b33b541a04ece0eef420674a.1540752056.git.aditya@kobol.io>
+In-Reply-To: <3eb15c0c6a0f26e418074cf3be9490a36f9161fd.1540752056.git.aditya@kobol.io>
+References: <3eb15c0c6a0f26e418074cf3be9490a36f9161fd.1540752056.git.aditya@kobol.io>
+From: Aditya Prayoga <aditya@kobol.io>
+Date: Thu, 18 Oct 2018 13:40:13 +0800
+Subject: arm: mvebu: helios4: Add extra environment variable to
+ support Armbian
+
+Armbian boot script use different env variable name to load armbianEnv.txt
+and device tree
+---
+ include/configs/helios4.h | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/include/configs/helios4.h b/include/configs/helios4.h
+index c289490..9a9bb4f 100644
+--- a/include/configs/helios4.h
++++ b/include/configs/helios4.h
+@@ -165,6 +165,8 @@
+ 	LOAD_ADDRESS_ENV_SETTINGS \
+ 	"fdtfile=" CONFIG_DEFAULT_DEVICE_TREE ".dtb\0" \
+ 	"console=ttyS0,115200\0" \
++	"loadaddr=0x02000000\0" \
++	"fdt_addr=" FDT_ADDR_R "\0" \
+ 	BOOTENV
+ 
+ #endif /* CONFIG_SPL_BUILD */
+-- 
+2.7.4
+

docs/uboot.md

@@ -1,4 +1,140 @@
-## Cross compiler
+## U-Boot 2018
+
+Based on mainline U-Boot.
+
+### Dependencies
+
+- bison (YACC-compatible parser generator)
+- flex (fast lexical analyzer generator)
+- bc (GNU bc arbitrary precision calculator language)
+- openssl/bn.h header (Secure Sockets Layer toolkit - development files)
+- make (GNU Make)
+- gcc (GNU C Compiler)
+
+Under Debian / Ubuntu, the dependencies can be installed using
+
+```bash
+sudo apt-get -y install bison flex bc libssl-dev make gcc
+```
+
+
+### Cross compiler
+
+Even though mainline U-Boot requires GCC minimum version 6, it would generate oversized SPL (Secondary Program Loader) image. Therefore it is recommended to use GCC version 7.
+
+#### Ubuntu 18.04 LTS
+
+Install the toolchain.
+
+```bash
+sudo apt -y install gcc-arm-linux-gnueabihf binutils-arm-linux-gnueabihf
+```
+
+Setup environment for cross compiling.
+```bash
+export ARCH=arm
+export CROSS_COMPILE=arm-linux-gnueabihf-
+```
+
+#### Other OS/ Distribution
+
+Other OS / Distribution that does not have GCC version 7 such as Debian, should use Linaro arm-linux-gnueabihf toolchain.
+
+Download and extract the toolchain.
+
+```bash
+cd ~
+
+wget http://releases.linaro.org/components/toolchain/binaries/7.3-2018.05/arm-linux-gnueabihf/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz
+
+tar Jxf gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz
+
+```
+
+!!! note
+    Latest Linaro toolchain version 7 can be found [here](http://releases.linaro.org/components/toolchain/binaries/latest-7/arm-linux-gnueabihf/).
+
+Setup environment for cross compiling.
+```bash
+export ARCH=arm
+export CROSS_COMPILE=~/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
+```
+
+
+### Compile U-Boot
+
+```bash
+git clone https://github.com/helios-4/u-boot.git -b helios4
+
+cd u-boot
+
+make mrproper
+make helios4_defconfig
+```
+
+!!! note
+    To support Armbian boot script (/boot/boot.scr), please apply [this patch](/files/uboot/u-boot-mainline-armbian-boot-script-support.patch) to U-Boot source code before
+    
+    *make helios4_defconfig*
+
+#### SD Card image
+
+```bash
+make -j$(nproc)
+```
+
+it would produced **u-boot-spl.kwb** 
+
+#### SPI NOR flash image
+
+Since *helios4_defconfig* targeting SD card image, we need to modified the configuration to generate SPI NOR flash image before compiling.
+
+```bash
+mv -f .config .config_mmc
+
+awk '{\
+gsub(/CONFIG_MVEBU_SPL_BOOT_DEVICE_MMC=y/,"# CONFIG_MVEBU_SPL_BOOT_DEVICE_MMC is not set");\
+gsub(/# CONFIG_MVEBU_SPL_BOOT_DEVICE_SPI is not set/,"CONFIG_MVEBU_SPL_BOOT_DEVICE_SPI=y");\
+gsub(/CONFIG_ENV_IS_IN_MMC=y/,"# CONFIG_ENV_IS_IN_MMC is not set");\
+gsub(/# CONFIG_ENV_IS_IN_SPI_FLASH is not set/,"CONFIG_ENV_IS_IN_SPI_FLASH=y");\
+}1' .config_mmc >> .config
+
+rm -f .config_mmc
+
+make -j$(nproc)
+```
+
+it would produced **u-boot-spl.kwb**
+
+
+### Customize U-Boot
+
+U-Boot has configuration editor based on ncurses similar like Linux Kernel configuration editor.
+
+Install ncurses development files. Under Debian/Ubuntu can be done using this command
+
+```bash
+sudo apt-get -y install libncurses5-dev
+```
+
+Launch configuration editor
+
+```bash
+make menuconfig
+```
+
+![menuconfig main](/img/u-boot/u-boot_menuconfig_main.png)
+
+After exiting the configuration editor and saving the configuration, build the image according to [SD Card image](#sd-card-image) or [SPI NOR flash image](#spi-nor-flash-image) instructions.
+
+
+- - -
+
+## Marvell U-Boot 2013.01
+
+Based on U-Boot 2013.01 Marvell version: 2015_T1.0p16
+
+### Cross compiler
 
 Under Debian / Ubuntu you need first to install the necessary packages and tools for cross compiling for ARM.
 
@@ -11,7 +147,7 @@ Other option, use Linaro cross compiler 4.9.4 arm-gnueabi toolchain. Download [h
 !!! Note
 	DO NOT use hard-float variant (arm-linux-gnueabihf).
 
-## Compile U Boot
+### Compile U-Boot
 
 ```bash
 git clone https://github.com/helios-4/u-boot-marvell.git
@@ -29,10 +165,10 @@ make mrproper
     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 (/boot/boot.src), please apply [this patch](/files/uboot/u-boot-armbian-boot-script-support.patch) to U-Boot source code.
+    To support Armbian boot script (/boot/boot.scr), please apply [this patch](/files/uboot/u-boot-armbian-boot-script-support.patch) to U-Boot source code.
 
 
-### SD Card image
+#### SD Card image
 
 ```
 ./build.pl -f mmc -b armada_38x_helios4
@@ -41,7 +177,7 @@ make mrproper
 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
+#### SPI NOR flash image
 
 ```
 ./build.pl -f spi -b armada_38x_helios4