[Buildroot] [PATCH v4 7/7] beaglebone: adds barebox bootloader defconfig
Arnout Vandecappelle
arnout at mind.be
Mon Apr 4 23:37:46 UTC 2016
On 03/20/16 23:35, Pieter Smith wrote:
> * Builds the barebox MLO and bootloader.
> * Generates a barebox environment that boots from eMMC by default.
> * Barebox integrates a perfectly good device-tree for the bbb, so no dtb is
> being generated with the kernel.
>
> Signed-off-by: Pieter Smith <pieter at boesman.nl>
> ---
> board/beaglebone/barebox.env/boot/sd | 6 +++++
> board/beaglebone/barebox.env/config-board | 4 +++
> configs/beaglebone_barebox_defconfig | 41 +++++++++++++++++++++++++++++++
> 3 files changed, 51 insertions(+)
> create mode 100644 board/beaglebone/barebox.env/boot/sd
> create mode 100644 board/beaglebone/barebox.env/config-board
> create mode 100644 configs/beaglebone_barebox_defconfig
>
> diff --git a/board/beaglebone/barebox.env/boot/sd b/board/beaglebone/barebox.env/boot/sd
> new file mode 100644
> index 0000000..7a80e29
> --- /dev/null
> +++ b/board/beaglebone/barebox.env/boot/sd
> @@ -0,0 +1,6 @@
> +#!/bin/sh
Is that needed/useful?
> +
> +global.bootm.image=/boot/zImage
> +#global.bootm.oftree=/boot/oftree
Maybe repeat here the comment about using the built-in DT.
> +#global.bootm.initrd=<path to initrd>
I would remove this line, it's not very useful.
> +global.linux.bootargs.dyn.root="root=/dev/mmcblk0p2 rootfstype=ext2 rootwait"
> diff --git a/board/beaglebone/barebox.env/config-board b/board/beaglebone/barebox.env/config-board
> new file mode 100644
> index 0000000..cd7b26d
> --- /dev/null
> +++ b/board/beaglebone/barebox.env/config-board
> @@ -0,0 +1,4 @@
> +#!/bin/sh
> +
> +global.boot.default=sd
> +
> diff --git a/configs/beaglebone_barebox_defconfig b/configs/beaglebone_barebox_defconfig
> new file mode 100644
> index 0000000..6324dbf
> --- /dev/null
> +++ b/configs/beaglebone_barebox_defconfig
> @@ -0,0 +1,41 @@
> +# architecture
> +BR2_arm=y
> +BR2_cortex_a8=y
> +BR2_ARM_EABIHF=y
> +
> +# system
> +BR2_TARGET_GENERIC_HOSTNAME="beaglebone"
> +BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_DEVTMPFS=y
> +BR2_TARGET_GENERIC_GETTY_PORT="ttyO0"
Does the default (console) not work well?
> +# BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW is not set
Why?
> +# BR2_ROOTFS_POST_IMAGE_SCRIPT is not set
This is the default. However, it would be nice if you could add a genimage
script. Pandaboard should be a good basis.
> +
> +# filesystem
> +BR2_PACKAGE_AM33X_CM3=y
> +BR2_TARGET_ROOTFS_EXT2=y
We tend to prefer ext4 nowadays.
> +# BR2_TARGET_ROOTFS_TAR is not set
> +
> +# Linux headers same as kernel, a 4.4 series
> +BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_4=y
The version should be really locked down, i.e.:
BR2_LINUX_KERNEL_CUSTOM_VERSION=y
BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.4.6"
> +
> +# bootloader
> +BR2_TARGET_BAREBOX=y
> +BR2_TARGET_BAREBOX_BOARD_DEFCONFIG="am335x"
> +BR2_TARGET_BAREBOX_BUILT_IMAGE_FILE="barebox-am33xx-beaglebone.img"
> +BR2_TARGET_BAREBOX_CUSTOM_ENV=y
> +BR2_TARGET_BAREBOX_CUSTOM_ENV_PATH="board/beaglebone/barebox.env"
> +BR2_TARGET_BAREBOX_2=y
> +BR2_TARGET_BAREBOX_2_BOARD_DEFCONFIG="am335x_mlo"
> +BR2_TARGET_BAREBOX_2_BUILT_IMAGE_FILE="barebox-am33xx-beaglebone-mlo.img"
> +BR2_TARGET_BAREBOX_2_OUTPUT_IMAGE_FILE="MLO"
> +
> +# kernel
> +BR2_LINUX_KERNEL=y
> +BR2_LINUX_KERNEL_CUSTOM_VERSION=y
> +BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.4.6"
Maybe you can switch to 4.5 already?
> +BR2_LINUX_KERNEL_USE_DEFCONFIG=y
> +BR2_LINUX_KERNEL_DEFCONFIG="omap2plus"
> +BR2_LINUX_KERNEL_ZIMAGE=y
> +
> +# Use the barebox built-in dtb
> +# BR2_LINUX_KERNEL_DTS_SUPPORT is not set
Good to put this here!
Regards,
Arnout
--
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
Essensium/Mind http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint: 7493 020B C7E3 8618 8DEC 222C 82EB F404 F9AC 0DDF
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