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#
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# Build and Setup U-Boot
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#
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# Load utility functions
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. ./functions.sh
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# Fetch and build U-Boot bootloader
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if [ "$ENABLE_UBOOT" = true ] ; then
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# Install c/c++ build environment inside the chroot
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chroot_install_cc
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# Copy existing U-Boot sources into chroot directory
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if [ -n "$UBOOTSRC_DIR" ] && [ -d "$UBOOTSRC_DIR" ] ; then
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# Copy local U-Boot sources
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cp -r "${UBOOTSRC_DIR}" "${R}/tmp"
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else
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# Create temporary directory for U-Boot sources
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temp_dir=$(as_nobody mktemp -d)
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# Fetch U-Boot sources
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as_nobody git -C "${temp_dir}" clone "${UBOOT_URL}"
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# Copy downloaded U-Boot sources
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mv "${temp_dir}/u-boot" "${R}/tmp/"
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# Set permissions of the U-Boot sources
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chown -R root:root "${R}/tmp/u-boot"
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# Remove temporary directory for U-Boot sources
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rm -fr "${temp_dir}"
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fi
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# Build and install U-Boot inside chroot
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chroot_exec make -j${KERNEL_THREADS} -C /tmp/u-boot/ ${UBOOT_CONFIG} all
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# Copy compiled bootloader binary and set config.txt to load it
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install_exec "${R}/tmp/u-boot/tools/mkimage" "${R}/usr/sbin/mkimage"
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install_readonly "${R}/tmp/u-boot/u-boot.bin" "${BOOT_DIR}/u-boot.bin"
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printf "\n# boot u-boot kernel\nkernel=u-boot.bin\n" >> "${BOOT_DIR}/config.txt"
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# Install and setup U-Boot command file
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install_readonly files/boot/uboot.mkimage "${BOOT_DIR}/uboot.mkimage"
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printf "# Set the kernel boot command line\nsetenv bootargs \"earlyprintk ${CMDLINE}\"\n\n$(cat ${BOOT_DIR}/uboot.mkimage)" > "${BOOT_DIR}/uboot.mkimage"
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if [ "$ENABLE_INITRAMFS" = true ] ; then
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# Convert generated initramfs for U-Boot using mkimage
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chroot_exec /usr/sbin/mkimage -A "${KERNEL_ARCH}" -T ramdisk -C none -n "initramfs-${KERNEL_VERSION}" -d "/boot/firmware/initramfs-${KERNEL_VERSION}" "/boot/firmware/initramfs-${KERNEL_VERSION}.uboot"
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# Remove original initramfs file
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rm -f "${BOOT_DIR}/initramfs-${KERNEL_VERSION}"
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# Configure U-Boot to load generated initramfs
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printf "# Set initramfs file\nsetenv initramfs initramfs-${KERNEL_VERSION}.uboot\n\n$(cat ${BOOT_DIR}/uboot.mkimage)" > "${BOOT_DIR}/uboot.mkimage"
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printf "\nbootz \${kernel_addr_r} \${ramdisk_addr_r} \${fdt_addr_r}" >> "${BOOT_DIR}/uboot.mkimage"
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else # ENABLE_INITRAMFS=false
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# Remove initramfs from U-Boot mkfile
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sed -i '/.*initramfs.*/d' "${BOOT_DIR}/uboot.mkimage"
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if [ "$BUILD_KERNEL" = false ] ; then
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# Remove dtbfile from U-Boot mkfile
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sed -i '/.*dtbfile.*/d' "${BOOT_DIR}/uboot.mkimage"
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printf "\nbootz \${kernel_addr_r}" >> "${BOOT_DIR}/uboot.mkimage"
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else
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printf "\nbootz \${kernel_addr_r} - \${fdt_addr_r}" >> "${BOOT_DIR}/uboot.mkimage"
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fi
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fi
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# Set mkfile to use the correct dtb file
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sed -i "s/^\(setenv dtbfile \).*/\1${DTB_FILE}/" "${BOOT_DIR}/uboot.mkimage"
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# Set mkfile to use kernel image
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sed -i "s/^\(fatload mmc 0:1 \${kernel_addr_r} \).*/\1${KERNEL_IMAGE}/" "${BOOT_DIR}/uboot.mkimage"
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# Remove all leading blank lines
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sed -i "/./,\$!d" "${BOOT_DIR}/uboot.mkimage"
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# Generate U-Boot bootloader image
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chroot_exec /usr/sbin/mkimage -A "${KERNEL_ARCH}" -O linux -T script -C none -a 0x00000000 -e 0x00000000 -n "RPi${RPI_MODEL}" -d /boot/firmware/uboot.mkimage /boot/firmware/boot.scr
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# Remove U-Boot sources
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rm -fr "${R}/tmp/u-boot"
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fi
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