Shell script to boot a 64-bit Allwinner SoC with a given kernel and initrd via FEL

fel_boot_kernel.sh

#!/bin/sh

# ADJUST to match your setup
INITRD=/srv/tftp/busybox.initrd.gz
UBOOT_DIR=/src/u-boot.git

if [ $# -eq 0 -o "$1" = "-h" ]
then
	echo "usage: %0 <kernel.img> [<cmdline>]"
	exit 0
fi

kernel="$1"
shift

if [ $# -lt 1 ]
then
	cmdline="console=ttyS0,115200n8 earlycon"
else
	cmdline="$1"
	shift
fi

ramdisk_size=$(stat -c %s "$INITRD" | rax2 -)

tmpf="/tmp/bootscript.$$"

echo "setenv bootargs \"$cmdline\"" > $tmpf
echo "booti \$kernel_addr_r \$ramdisk_addr_r:$ramdisk_size \$fdtcontroladdr" >> $tmpf

mkimage -A arm -O linux -T script -C none -a 0 -e 0 -n "boot script" -d $tmpf ${tmpf}.img > /dev/null

$ECHO sunxi-fel -v -p uboot $UBOOT_DIR/u-boot-sunxi-with-spl.bin write 0x40080000 "$kernel" write 0x4ff00000 "$INITRD" write 0x4fe00000 ${tmpf}.img

rm -f $tmpf ${tmpf}.img