108 lines
3.4 KiB
Plaintext
108 lines
3.4 KiB
Plaintext
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VIA VAB-820/AMOS-820
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====================
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This file documents the Buildroot support for the VIA VAB-820 board and
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VIA AMOS-820 system, which are built around a Freescale i.MX6 Quad/Dual SoC.
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The kernel and u-boot is based on the official VIA BSP, which is in turn
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based on the Freescale Linux 3.10.17_1.0.0_ga BSP.
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Configuring and building Buildroot
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----------------------------------
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Start from the defconfig:
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$ make via_imx6_vab820_defconfig
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You can edit build options the usual way:
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$ make menuconfig
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When you are happy with the setup, run:
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$ make
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The result of the build with the default settings should be these files:
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output/images
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├── imx6q-vab820.dtb
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├── rootfs.tar
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├── u-boot.imx
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└── uImage
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Set up your SD card
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-------------------
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*Important*: pay attention which partition you are modifying so you don't
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accidentally erase the wrong file system, e.g your host computer or your
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external storage!
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In the default setup you need to create 2 partitions on your SD card:
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a boot partition and a root partition. In this guide and in the default u-boot
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settings the boot partition is vfat, while the root partition is ext4.
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You also need to leave space for u-boot at the beginning of the card, before
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all the partitions.
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For example, if your SD card is at /dev/sdX, using fdisk, and starting from
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an empty card, the steps are along these lines:
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# fdisk /dev/sdX
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n (new partition)
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p (primary partition)
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1 (first partition)
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<return> (default first sector, should be at least 1MB from the beginning
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which is 2048 sectors if the sector size is 512KB)
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+50M (50MB size, as an example)
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t (switch partition type)
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b (select "W95 FAT32" type)
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n (the second partition)
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p (primary partition)
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2 (second partition)
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<return> (default first sector)
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<return> (use all remaining space)
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p (print so the partition looks something like this below)
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Device Boot Start End Sectors Size Id Type
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/dev/sdX1 2048 104447 102400 50M b W95 FAT32
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/dev/sdX2 104448 15564799 15460352 7.4G 83 Linux
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w (save changes)
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After this you need to format the newly created file system:
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# mkfs.vfat -L boot /dev/sdX1
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# mkfs.ext4 -L rootfs /dev/sdX2
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Now the system can be copied onto the card. First copy the u-boot onto
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the region of the card before the first partition (starting from the
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root directory of buildroot):
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# dd if=output/images/u-boot.imx of=/dev/sdX bs=512 seek=2
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Mount the first partition /dev/sdX1, and copy the kernel and the
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compiled device tree:
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# cp output/images/uImage /mnt/<BOOT-PARTITION>
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# cp output/images/imx6q-vab820.dtb /mnt/<BOOT-PARTITION>
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Finally, copy the root file system onto the mounted (empty) /dev/sdX2
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rootfs partition:
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# tar xf output/images/rootfs.tar -C /mnt/<ROOTFS-PARTITION>
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Booting
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-------
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To use the on-card u-boot, you need adjust jumper J11 located just next to
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the SD card slot on the VAB-820 board. The correct position for SD card
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boot is jumping the two pins towards the inside of the board.
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To modify the default boot parameters compiled into u-boot, you can create
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a boot script with the file name `boot.scr` and place it onto the boot
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partition (same directory as `uImage`).
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If you want to have the login prompt on the serial debug line instead of
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the console, adjust the buildroot settings as:
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"System Configuration > getty options > TTY port > ttymxc1"
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