* [Buildroot] [PATCH] configs: add lego_ev3_defconfig
@ 2014-06-15 13:56 Vincent Stehlé
2014-06-18 15:04 ` Peter Korsgaard
0 siblings, 1 reply; 2+ messages in thread
From: Vincent Stehlé @ 2014-06-15 13:56 UTC (permalink / raw)
To: buildroot
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.
Signed-off-by: Vincent Stehl? <vincent.stehle@laposte.net>
---
board/lego/ev3/readme.txt | 135 +++++++++++++++++++++++++++++++++++++++++++++
configs/lego_ev3_defconfig | 23 ++++++++
2 files changed, 158 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 0000000..3c0bd2e
--- /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 ?SD card. It will try to load a uImage from the first ?SD 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 ?SD 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 ?SD 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 0000000..c7bf857
--- /dev/null
+++ b/configs/lego_ev3_defconfig
@@ -0,0 +1,23 @@
+# 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"
+
+# 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
--
2.0.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [Buildroot] [PATCH] configs: add lego_ev3_defconfig
2014-06-15 13:56 [Buildroot] [PATCH] configs: add lego_ev3_defconfig Vincent Stehlé
@ 2014-06-18 15:04 ` Peter Korsgaard
0 siblings, 0 replies; 2+ messages in thread
From: Peter Korsgaard @ 2014-06-18 15:04 UTC (permalink / raw)
To: buildroot
>>>>> "Vincent" == Vincent Stehl? <vincent.stehle@laposte.net> writes:
> 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.
> Signed-off-by: Vincent Stehl? <vincent.stehle@laposte.net>
Nice, if somebody wants to sponsor me a EV3, I (and my son) will happily
accept ;)
> diff --git a/configs/lego_ev3_defconfig b/configs/lego_ev3_defconfig
> new file mode 100644
> index 0000000..c7bf857
> --- /dev/null
> +++ b/configs/lego_ev3_defconfig
> @@ -0,0 +1,23 @@
> +# 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"
> +
> +# 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"
We should also lock the kernel headers to 3.3.x to match the kernel.
Committed with that fixed, thanks.
--
Bye, Peter Korsgaard
^ permalink raw reply [flat|nested] 2+ messages in thread
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2014-06-15 13:56 [Buildroot] [PATCH] configs: add lego_ev3_defconfig Vincent Stehlé
2014-06-18 15:04 ` Peter Korsgaard
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