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#
# Setup Uboot
#
. ./functions.sh
# Install gcc/c++ build environment inside the chroot
if [ "$ENABLE_UBOOT" = true ] || [ "$ENABLE_FBTURBO" = true ]; then
chroot_exec apt-get install -q -y --force-yes --no-install-recommends linux-compiler-gcc-4.9-arm g++ make bc
fi
# Fetch and build U-Boot bootloader
if [ "$ENABLE_UBOOT" = true ] ; then
# Fetch U-Boot bootloader sources
git -C $R/tmp clone git://git.denx.de/u-boot.git
# Build and install U-Boot inside chroot
chroot_exec make -C /tmp/u-boot/ rpi_2_defconfig all
# Copy compiled bootloader binary and set config.txt to load it
cp $R/tmp/u-boot/u-boot.bin $R/boot/firmware/
printf "\n# boot u-boot kernel\nkernel=u-boot.bin\n" >> $R/boot/firmware/config.txt
# Set U-Boot command file
cat <<EOM >$R/boot/firmware/uboot.mkimage
# Tell Linux that it is booting on a Raspberry Pi2
setenv machid 0x00000c42
# Set the kernel boot command line
setenv bootargs "earlyprintk ${CMDLINE}"
# Save these changes to u-boot's environment
saveenv
# Load the existing Linux kernel into RAM
fatload mmc 0:1 \${kernel_addr_r} kernel7.img
# Boot the kernel we have just loaded
bootz \${kernel_addr_r}
EOM
# Generate U-Boot image from command file
chroot_exec mkimage -A arm -O linux -T script -C none -a 0x00000000 -e 0x00000000 -n "RPi2 Boot Script" -d /boot/firmware/uboot.mkimage /boot/firmware/boot.scr
fi
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