bb7628b30c
For consistency, rename atmel_xplained_defconfig to atmel_sama5d3_xplained_mmc_defconfig as this configuration supports booting the sama5d3 Xplained with an MMC card (as opposed to the NAND flash). Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
74 lines
2.3 KiB
Plaintext
74 lines
2.3 KiB
Plaintext
Atmel SAMA5D3 Xplained board
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============================
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This document explains how to set up a basic Buildroot system on the
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Atmel SAMA5D3 Xplained board, whose main site is
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http://www.atmel.com/tools/ATSAMA5D3-XPLD.aspx. Additional details can
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also be found on the http://www.at91.com/linux4sam/bin/view/Linux4SAM/
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web site.
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Note that the default Buildroot configuration is prepared to boot from
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an SD card: the first stage bootloader, second stage bootloader,
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kernel image and root filesystem are all located on the SD card. Some
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adjustments in the bootloader configuration will be needed to boot
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from NAND flash, see board/atmel/nandflash.txt
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Configuring and building Buildroot
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----------------------------------
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make atmel_sama5d3_xplained_mmc_defconfig
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make
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Preparing the SD card
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---------------------
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The SD card must be partitioned with at least two partitions: one
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FAT16 partition for the bootloaders, kernel image and Device Tree
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blob, and one ext4 partition for the root filesystem. To partition the
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SD card:
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sudo sfdisk -uM /dev/mmcblk0 <<EOF
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,64,6
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;
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EOF
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This creates a 64 MB partition for the FAT16 filesystem (type 6) and
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uses the rest for the ext4 filesystem used for the root filesystem.
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Then, format both partitions:
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sudo mkfs.msdos -n boot /dev/mmcblk0p1
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sudo mkfs.ext4 -L rootfs -O ^huge_file /dev/mmcblk0p2
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Note: the -O ^huge_file option is needed to avoid enabling the huge
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files features of ext4 (to support files larges than 2 TB), which
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needs the kernel option CONFIG_LBDAF to be enabled.
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Mount both partitions (if not done automatically by your system):
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sudo mount /dev/mmcblk0p1 /media/boot
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sudo mount /dev/mmcblk0p2 /media/rootfs
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Copy the bootloaders, kernel image and Device Tree blob to the first
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partition:
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cp output/images/uboot-spl.bin /media/boot/boot.bin
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cp output/images/u-boot.img /media/boot/u-boot.img
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cp output/images/zImage /media/boot/zImage
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cp output/images/at91-sama5d3_xplained.dtb /media/boot/at91-sama5d3_xplained.dtb
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Extract the root filesystem to the second partition:
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sudo tar -C /media/rootfs -xf output/images/rootfs.tar
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Unmount both partitions:
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sudo umount /media/boot
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sudo umount /media/rootfs
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Insert your SD card in your Xplained board, and enjoy. The default
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U-Boot environment will properly load the kernel and Device Tree blob
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from the first partition of the SD card, so everything works
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automatically.
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