sd-card-images/scripts/build-boot-qemu

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#!/bin/sh
# Build SD card image
BOARD_ID="${1}" # For example "bananapi"
CHIP_ID="${2}" # For example "allwinner-a10"
DEFCONFIG="${3}" # For example "Bananapi_defconfig"
TUPLE="${4}" # For example "arm-linux-gnueabihf"
set -ex
build-u_boot "${DEFCONFIG}" "${TUPLE}"
case "${CHIP_ID}" in
qemu-x86|qemu-x86_64)
FILE=u-boot.rom
;;
qemu-arm|qemu-aarch64)
FILE=u-boot.bin
;;
*)
echo "Unknown CHIP_ID \"${CHIP_ID}\""
exit 1
esac
# Copy U-Boot to 16 sectors from start
dd if=u-boot/"${FILE}" of=tmp.img seek=16 conv=notrunc