Barebox provides an option to embed a custom environment image into
barebox binary. This image will be used, when the environment found in
the environment sector is invalid. Both embedded and external images
can be used together, so having both options at the same time is
justified.
This patch sets barebox Kconfig option CONFIG_DEFAULT_ENVIRONMENT_PATH
to user specified path. This way one can use such BR's variables like
BR2_EXTERNAL, TOPDIR etc. to provide paths to custom environment
folders.
Cc: Pieter Smith <pieter@boesman.nl>
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Adds support to build barebox with an auxiliary config.
This is useful for building an SPL (Secondary Program Loader) in
addition to the traditional TPL (Tertiary Program Loader). The
Beaglebone Black for example has two barebox configurations:
- am335x_defconfig builds the full barebox bootloader with device
tree
- am335x_mlo_defconfig builds the smaller MLO bootloader that loads
the full barebox bootloader from the eMMC or SD card.
Tested with the following defconfig:
# 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_REMOUNT_ROOTFS_RW=y
# filesystem
BR2_PACKAGE_AM33X_CM3=y
BR2_TARGET_ROOTFS_EXT2=y
BR2_TARGET_ROOTFS_EXT2_4=y
# bootloader
BR2_TARGET_BAREBOX=y
BR2_TARGET_BAREBOX_BOARD_DEFCONFIG="am335x"
BR2_TARGET_BAREBOX_IMAGE_FILE="images/barebox-am33xx-beaglebone.img"
BR2_TARGET_BAREBOX_CUSTOM_ENV=y
BR2_TARGET_BAREBOX_CUSTOM_ENV_PATH="board/beaglebone/barebox/barebox.env"
BR2_TARGET_BAREBOX_AUX=y
BR2_TARGET_BAREBOX_AUX_BOARD_DEFCONFIG="am335x_mlo"
BR2_TARGET_BAREBOX_AUX_IMAGE_FILE="images/barebox-am33xx-beaglebone-mlo.img"
# kernel
BR2_LINUX_KERNEL=y
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
Signed-off-by: Pieter Smith <pieter@boesman.nl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
