From 0053b5c10d1d7c20a018b546b9cc7abbc1c63dc9 Mon Sep 17 00:00:00 2001 From: Vincent Date: Sun, 15 Jun 2014 15:56:37 +0200 Subject: [PATCH] configs: add lego_ev3_defconfig MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Peter Korsgaard --- board/lego/ev3/readme.txt | 135 +++++++++++++++++++++++++++++++++++++ configs/lego_ev3_defconfig | 28 ++++++++ 2 files changed, 163 insertions(+) create mode 100644 board/lego/ev3/readme.txt create mode 100644 configs/lego_ev3_defconfig diff --git a/board/lego/ev3/readme.txt b/board/lego/ev3/readme.txt new file mode 100644 index 0000000000..3c0bd2ec46 --- /dev/null +++ b/board/lego/ev3/readme.txt @@ -0,0 +1,135 @@ +Lego Mindstorms EV3 + +Intro +===== + +This is the buildroot basic board support for the Lego Mindstorms EV3 +programmable brick. No support for sensors and drivers is provided for the +moment. + +The Lego Mindstorms EV3 brick comprises a Texas Instruments AM1808 SoC, with +an ARM 926EJ-S main processor running at 300 MHz. +See: +- https://en.wikipedia.org/wiki/Lego_Mindstorms_EV3 +- http://www.lego.com/en-us/mindstorms/products/ev3/31313-mindstorms-ev3/ +- http://www.ti.com/product/am1808 + +The buildroot configuration uses the Linux kernel of the ev3dev project. +See: +- http://botbench.com/blog/2013/07/31/lego-mindstorms-ev3-source-code-available/ +- https://github.com/mindboards/ev3sources + +Note that the EV3 configuration uses gcc 4.7, as the boot is broken with gcc +4.8. + +How it works +============ + +Boot process : +-------------- + +The u-boot on-board the EV3 brick has provision to boot a Linux kernel from the +external µSD card. It will try to load a uImage from the first µSD card +partition, which must be formatted with a FAT filesystem. + +How to build it +=============== + +Configure Buildroot +------------------- + +The lego_ev3_defconfig configuration provides basic support to boot on the Lego +Mindstorms EV3 programmable brick: + + $ make lego_ev3_defconfig + +Build everything +---------------- + +Note: you will need to have access to the network, since Buildroot will +download the packages' sources. + + $ make + +Result of the build +------------------- + +After building, you should obtain this tree: + + output/images/ + ├── rootfs.ext2 + ├── rootfs.ext3 -> rootfs.ext2 + └── uImage + + +Prepare your SDcard +=================== + +The following µSD card layout is recommended: + +- First partition formated with a FAT filesystem, containing the uImage. +- Second partition formatted as ext2 or ext3, containing the root filesystem. + +Create the SDcard partition table +---------------------------------- + +Determine the device associated to the SD card : + + $ cat /proc/partitions + +Let's assume it is /dev/mmcblk0 : + + $ sudo fdisk /dev/mmcblk0 + +Delete all previous partitions by creating a new disklabel with 'o', then +create the new partition table, using these options, pressing enter after each +one: + + * n p 1 2048 +10M t c + * n p 2 22528 +256M + +Using the 'p' option, the SD card's partition must look like this : + +Device Boot Start End Blocks Id System +/dev/mmcblk0p1 2048 22527 10240 c W95 FAT32 (LBA) +/dev/mmcblk0p2 22528 546815 262144 83 Linux + +Then write the partition table using 'w' and exit. + +Make partition one a DOS partition : + + $ sudo mkfs.vfat /dev/mmcblk0p1 + +Install the binaries to the SDcard +---------------------------------- + +Remember your binaries are located in output/images/, go inside that directory : + + $ cd output/images + +Copy the Linux kernel: + + $ sudo mkdir /mnt/sdcard + $ sudo mount /dev/mmcblk0p1 /mnt/sdcard + $ sudo cp uImage /mnt/sdcard + $ sudo umount /mnt/sdcard + +Copy the rootfs : + + $ sudo dd if=rootfs.ext3 of=/dev/mmcblk0p2 bs=1M + $ sync + +It's Done! + +Finish +====== + +Eject your µSD card, insert it in your Lego EV3, and power it up. + +To have a serial console, you will need a proper USB to Lego serial port +adapter plugged into the EV3 sensors port 1. +See: +- http://botbench.com/blog/2013/08/15/ev3-creating-console-cable/ +- http://botbench.com/blog/2013/08/05/mindsensors-ev3-usb-console-adapter/ + +The serial port config to use is 115200/8-N-1. diff --git a/configs/lego_ev3_defconfig b/configs/lego_ev3_defconfig new file mode 100644 index 0000000000..e4c7facb96 --- /dev/null +++ b/configs/lego_ev3_defconfig @@ -0,0 +1,28 @@ +# architecture +BR2_arm=y +BR2_arm926t=y + +# toolchain +# Use gcc 4.7, as gcc 4.8 breaks the boot. +BR2_GCC_VERSION_4_7_X=y + +# system +BR2_TARGET_GENERIC_GETTY=y +BR2_TARGET_GENERIC_GETTY_PORT="ttyS1" + +# Lock to 3.3 headers to avoid breaking with newer kernels +BR2_KERNEL_HEADERS_VERSION=y +BR2_DEFAULT_KERNEL_VERSION="3.3" +BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_3=y + +# Kernel +BR2_LINUX_KERNEL=y +BR2_LINUX_KERNEL_CUSTOM_GIT=y +BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/mindboards/ev3dev-kernel.git" +BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="v3.3.0-2-ev3dev_0" +BR2_LINUX_KERNEL_DEFCONFIG="ev3dev" + +# filesystem +BR2_TARGET_ROOTFS_EXT2=y +BR2_TARGET_ROOTFS_EXT2_3=y +# BR2_TARGET_ROOTFS_TAR is not set