98295c5330
Changes: * Update Kernel and U-Boot to the latest 2.0.6 BSP release from the official sources. * Add genimage config to create bootable SD card image Signed-off-by: Gergely Imreh <imrehg@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
121 lines
3.8 KiB
Plaintext
121 lines
3.8 KiB
Plaintext
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
|
|
├── boot.vfat
|
|
├── imx6q-vab820.dtb
|
|
├── rootfs.ext2
|
|
├── rootfs.ext4 -> rootfs.ext2
|
|
├── rootfs.tar
|
|
├── sdcard.img
|
|
├── u-boot.imx
|
|
└── uImage
|
|
|
|
Copy the bootable `sdcard.img` onto an SD card with "dd":
|
|
|
|
$ sudo dd if=output/images/sdcard.img of=/dev/sdX bs=1M conv=fsync
|
|
|
|
where "sdX" is the appropriate partition of your card.
|
|
|
|
For details about the medium image layout, see the definition in
|
|
`board/via/imx6_vab820/genimage.cfg`.
|
|
|
|
|
|
Setting up your SD card manually
|
|
--------------------------------
|
|
|
|
*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"
|