configs: add lego_ev3_defconfig
Add initial support for the Lego Mindstorms EV3 programmable brick. The Lego Mindstorms EV3 brick comprises a Texas Instruments AM1808 SoC, with an ARM 926EJ-S main processor running at 300 MHz. https://en.wikipedia.org/wiki/Lego_Mindstorms_EV3 This configuration uses the Linux kernel of the ev3dev project. https://github.com/mindboards/ev3sources More info is available in the board/lego/ev3/readme.txt file, shamelessly documented in the same way as the SoCkit folks did. [Peter: lock kernel headers to match] Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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Vincent
Peter Korsgaard
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Lego Mindstorms EV3
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Intro
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=====
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This is the buildroot basic board support for the Lego Mindstorms EV3
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programmable brick. No support for sensors and drivers is provided for the
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moment.
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The Lego Mindstorms EV3 brick comprises a Texas Instruments AM1808 SoC, with
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an ARM 926EJ-S main processor running at 300 MHz.
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See:
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- https://en.wikipedia.org/wiki/Lego_Mindstorms_EV3
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- http://www.lego.com/en-us/mindstorms/products/ev3/31313-mindstorms-ev3/
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- http://www.ti.com/product/am1808
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The buildroot configuration uses the Linux kernel of the ev3dev project.
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See:
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- http://botbench.com/blog/2013/07/31/lego-mindstorms-ev3-source-code-available/
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- https://github.com/mindboards/ev3sources
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Note that the EV3 configuration uses gcc 4.7, as the boot is broken with gcc
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4.8.
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How it works
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============
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Boot process :
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--------------
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The u-boot on-board the EV3 brick has provision to boot a Linux kernel from the
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external µSD card. It will try to load a uImage from the first µSD card
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partition, which must be formatted with a FAT filesystem.
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How to build it
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===============
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Configure Buildroot
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-------------------
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The lego_ev3_defconfig configuration provides basic support to boot on the Lego
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Mindstorms EV3 programmable brick:
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$ make lego_ev3_defconfig
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Build everything
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----------------
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Note: you will need to have access to the network, since Buildroot will
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download the packages' sources.
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$ make
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Result of the build
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-------------------
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After building, you should obtain this tree:
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output/images/
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├── rootfs.ext2
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├── rootfs.ext3 -> rootfs.ext2
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└── uImage
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Prepare your SDcard
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===================
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The following µSD card layout is recommended:
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- First partition formated with a FAT filesystem, containing the uImage.
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- Second partition formatted as ext2 or ext3, containing the root filesystem.
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Create the SDcard partition table
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----------------------------------
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Determine the device associated to the SD card :
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$ cat /proc/partitions
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Let's assume it is /dev/mmcblk0 :
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$ sudo fdisk /dev/mmcblk0
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Delete all previous partitions by creating a new disklabel with 'o', then
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create the new partition table, using these options, pressing enter after each
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one:
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* n p 1 2048 +10M t c
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* n p 2 22528 +256M
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Using the 'p' option, the SD card's partition must look like this :
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Device Boot Start End Blocks Id System
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/dev/mmcblk0p1 2048 22527 10240 c W95 FAT32 (LBA)
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/dev/mmcblk0p2 22528 546815 262144 83 Linux
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Then write the partition table using 'w' and exit.
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Make partition one a DOS partition :
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$ sudo mkfs.vfat /dev/mmcblk0p1
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Install the binaries to the SDcard
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----------------------------------
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Remember your binaries are located in output/images/, go inside that directory :
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$ cd output/images
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Copy the Linux kernel:
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$ sudo mkdir /mnt/sdcard
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$ sudo mount /dev/mmcblk0p1 /mnt/sdcard
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$ sudo cp uImage /mnt/sdcard
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$ sudo umount /mnt/sdcard
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Copy the rootfs :
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$ sudo dd if=rootfs.ext3 of=/dev/mmcblk0p2 bs=1M
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$ sync
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It's Done!
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Finish
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======
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Eject your µSD card, insert it in your Lego EV3, and power it up.
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To have a serial console, you will need a proper USB to Lego serial port
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adapter plugged into the EV3 sensors port 1.
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See:
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- http://botbench.com/blog/2013/08/15/ev3-creating-console-cable/
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- http://botbench.com/blog/2013/08/05/mindsensors-ev3-usb-console-adapter/
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The serial port config to use is 115200/8-N-1.
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@ -0,0 +1,28 @@
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# architecture
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BR2_arm=y
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BR2_arm926t=y
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# toolchain
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# Use gcc 4.7, as gcc 4.8 breaks the boot.
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BR2_GCC_VERSION_4_7_X=y
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# system
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BR2_TARGET_GENERIC_GETTY=y
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BR2_TARGET_GENERIC_GETTY_PORT="ttyS1"
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# Lock to 3.3 headers to avoid breaking with newer kernels
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BR2_KERNEL_HEADERS_VERSION=y
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BR2_DEFAULT_KERNEL_VERSION="3.3"
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BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_3=y
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# Kernel
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BR2_LINUX_KERNEL=y
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BR2_LINUX_KERNEL_CUSTOM_GIT=y
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BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/mindboards/ev3dev-kernel.git"
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BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="v3.3.0-2-ev3dev_0"
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BR2_LINUX_KERNEL_DEFCONFIG="ev3dev"
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# filesystem
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BR2_TARGET_ROOTFS_EXT2=y
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BR2_TARGET_ROOTFS_EXT2_3=y
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# BR2_TARGET_ROOTFS_TAR is not set
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