board: add support for VIA VAB-820/AMOS-820

From 6e72bef18c928753c9861c1f6fc8c2c4dd5d1e97 Mon Sep 17 00:00:00 2001

From: Gergely Imreh <imrehg@gmail.com>

Date: Thu, 30 Apr 2015 16:24:38 +0800

Subject: [PATCH] default to boot from the SD card

---

 include/configs/mx6qvab820_common.h | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/configs/mx6qvab820_common.h b/include/configs/mx6qvab820_common.h

index 99bc8a9..2e70c94 100644

--- a/include/configs/mx6qvab820_common.h

+++ b/include/configs/mx6qvab820_common.h

@@ -216,7 +216,7 @@

 	"bootcmd_mmc=setenv mmcdev 1; setenv rootdev 0; setenv mmcname mmc; run bootcmd_main;\0"

 #define CONFIG_BOOTCOMMAND \

-	"run bootcmd_mmc"

+	"run bootcmd_sd"

 #define CONFIG_ARP_TIMEOUT     200UL

-- 

2.3.7

VIA VAB-820/AMOS-820

====================

This file documents the Buildroot support for the VIA VAB-820 board and

VIA AMOS-820 system, which are built around a Freescale i.MX6 Quad/Dual SoC.

The kernel and u-boot is based on the official VIA BSP, which is in turn

based on the Freescale Linux 3.10.17_1.0.0_ga BSP.

Configuring and building Buildroot

----------------------------------

Start from the defconfig:

  $ make via_imx6_vab820_defconfig

You can edit build options the usual way:

  $ make menuconfig

When you are happy with the setup, run:

  $ make

The result of the build with the default settings should be these files:

  output/images

  ├── imx6q-vab820.dtb

  ├── rootfs.tar

  ├── u-boot.imx

  └── uImage

Set up your SD card

-------------------

*Important*: pay attention which partition you are modifying so you don't

accidentally erase the wrong file system, e.g your host computer or your

external storage!

In the default setup you need to create 2 partitions on your SD card:

a boot partition and a root partition. In this guide and in the default u-boot

settings the boot partition is vfat, while the root partition is ext4.

You also need to leave space for u-boot at the beginning of the card, before

all the partitions.

For example, if your SD card is at /dev/sdX, using fdisk, and starting from

an empty card, the steps are along these lines:

  # fdisk /dev/sdX

  n         (new partition)

  p         (primary partition)

  1	    (first partition)

  <return>  (default first sector, should be at least 1MB from the beginning

             which is 2048 sectors if the sector size is 512KB)

  +50M      (50MB size, as an example)

  t         (switch partition type)

  b         (select "W95 FAT32" type)

  n         (the second partition)

  p         (primary partition)

  2	    (second partition)

  <return>  (default first sector)

  <return>  (use all remaining space)

  p         (print so the partition looks something like this below)

    Device     Boot  Start      End  Sectors  Size Id Type

    /dev/sdX1         2048   104447   102400   50M  b W95 FAT32

    /dev/sdX2       104448 15564799 15460352  7.4G 83 Linux

  w         (save changes)

After this you need to format the newly created file system:

  # mkfs.vfat -L boot /dev/sdX1

  # mkfs.ext4 -L rootfs /dev/sdX2

Now the system can be copied onto the card. First copy the u-boot onto

the region of the card before the first partition (starting from the

root directory of buildroot):

  # dd if=output/images/u-boot.imx of=/dev/sdX bs=512 seek=2

Mount the first partition /dev/sdX1, and copy the kernel and the

compiled device tree:

  # cp output/images/uImage /mnt/<BOOT-PARTITION>

  # cp output/images/imx6q-vab820.dtb /mnt/<BOOT-PARTITION>

Finally, copy the root file system onto the mounted (empty) /dev/sdX2

rootfs partition:

  # tar xf output/images/rootfs.tar -C /mnt/<ROOTFS-PARTITION>

Booting

-------

To use the on-card u-boot, you need adjust jumper J11 located just next to

the SD card slot on the VAB-820 board. The correct position for SD card

boot is jumping the two pins towards the inside of the board.

To modify the default boot parameters compiled into u-boot, you can create

a boot script with the file name `boot.scr` and place it onto the boot

partition (same directory as `uImage`).

If you want to have the login prompt on the serial debug line instead of

the console, adjust the buildroot settings as:

"System Configuration > getty options > TTY port > ttymxc1"

# Architecture

BR2_arm=y

BR2_cortex_a9=y

BR2_ARM_EABIHF=y

BR2_ARM_FPU_VFPV3=y

# Toolchain

BR2_KERNEL_HEADERS_VERSION=y

BR2_DEFAULT_KERNEL_VERSION="3.10.17"

BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_10=y

BR2_GLOBAL_PATCH_DIR="board/via/imx6_vab820/patches"

# Kernel

BR2_LINUX_KERNEL=y

BR2_LINUX_KERNEL_CUSTOM_GIT=y

BR2_LINUX_KERNEL_CUSTOM_REPO_URL="git://github.com/viaembedded/vab820-kernel-bsp.git"

BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="via_3.10.17_2.0.1"

BR2_LINUX_KERNEL_DEFCONFIG="imx_v7"

BR2_LINUX_KERNEL_UIMAGE_LOADADDR="0x10008000"

BR2_LINUX_KERNEL_UIMAGE=y

BR2_LINUX_KERNEL_DTS_SUPPORT=y

BR2_LINUX_KERNEL_USE_INTREE_DTS=y

BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6q-vab820"

# Bootloader

BR2_TARGET_UBOOT=y

BR2_TARGET_UBOOT_BOARDNAME="mx6qvab820"

BR2_TARGET_UBOOT_CUSTOM_GIT=y

BR2_TARGET_UBOOT_CUSTOM_REPO_URL="git://github.com/viaembedded/vab820-uboot-bsp.git"

BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION="via_3.10.17_2.0.1"

BR2_TARGET_UBOOT_FORMAT_IMX=y