##
# Build U-boot bootloader specific uImage/image.itb
#
# \param --image-uboot-no-gzip   do not gzip the uImage
# \param --image-uboot-fit       build image.itb FIT image
#


##
# Check if the uImage should be gzipped
#
proc image_uboot_use_no_gzip { } { return [get_cmd_switch --image-uboot-no-gzip] }

proc image_uboot_use_fit { } { return [get_cmd_switch --image-uboot-fit] }


##
# Make gzip compression more aggressive
#
# Using this option reduces the image size by circa 10%. But it comes at the
# cost of significantly slowing down the gzip step for large images (e.g., 6
# seconds instead of 2 seconds for a image of 13 MiB). The option is suitable
# when building a release. But for quick build-test cycles, it is best keep
# it disabled.
#
proc image_uboot_gzip_opt { } {
	if {[get_cmd_switch --image-uboot-gzip-best]} {
		return "--best"
	} else {
		return "--fast"
	}
}


##
# Build U-boot bootloader specific uImage
#
proc run_image { } {

	set elf_img [file join [run_dir] boot [kernel_specific_binary image.elf]]

	# parse ELF entrypoint and load address
	set entrypoint [exec [cross_dev_prefix]readelf -h $elf_img | \
			grep "Entry point address: " | \
			sed -e "s/.*Entry point address: *//"]
	set load_addr [exec [cross_dev_prefix]readelf -l $elf_img | \
		       grep -m 1 "LOAD"]
	set load_addr [lindex [regexp -inline -all -- {\S+} $load_addr] 3]

	set bin_img [file join [run_dir] boot image.bin]
	exec [cross_dev_prefix]objcopy -O binary $elf_img $bin_img

	set use_gzip [expr ![image_uboot_use_no_gzip]]
	set compress_type none
	set bin_ext ""

	# compress ELF
	if $use_gzip {
		exec gzip [image_uboot_gzip_opt] --force $bin_img
		set bin_ext .gz
		set compress_type gzip
	}

	set arch "arm"
	if {[have_spec arm_64]} { set arch "arm64" }

	if {[image_uboot_use_fit]} {
		# create image.itb
		set uboot_img [file join [run_dir] boot image.itb]
		exec mkimage -f auto -A $arch -O linux -T kernel -C $compress_type -a $load_addr \
		             -e $entrypoint -d $bin_img$bin_ext $uboot_img
	} else {
		# create uImage
		set uboot_img [file join [run_dir] boot uImage]
		exec mkimage -A $arch -O linux -T kernel -C $compress_type -a $load_addr \
		             -e $entrypoint -d $bin_img$bin_ext $uboot_img
	}
	exec rm -rf $bin_img$bin_ext $elf_img
}