Building arm64 image for booting in qemu

[Edward Tomasz Napierała]

On 0520T1929, Oleksandr Tymoshenko wrote:
> Gordon Bergling via freebsd-hackers (freebsd-hackers at freebsd.org) wrote:
> > Greetings,
> > 
> > I am currently try to setup a crossbuild for arm64 to test some 
> > local changes. I use the following steps to create the image 
> > after crossbuilding arm64 on amd64. These steps were taken from
> > the arm64_build.sh found at the FreeBSD wiki.
> 
> Hi Gordon,
> 
> I believe that script is very outdated in several areas. It refers
> to boot1.efifat which is not boot1.efi but a FAT image that contains
> boot1.efi as EFI\BOOT\bootaa64.efi. Also current version of u-boot-qemu
> looks for DTB file which is not provided by the script (probably it was
> built into u-boot before).

We use both u-boot-qemu-arm (for armv7) and u-boot-qemu-arm64 packages
on CI; they don't seem to depend on any external DTB.  You are right
about boot1.efi, though.  The arm64 part of the build script used on CI
(https://github.com/freebsd/freebsd-ci/blob/master/scripts/build/build-test_image-head.sh)
looks like this:

mkdir -p efi/EFI/BOOT
cp -f ufs/boot/loader_lua.efi efi/EFI/BOOT/bootaa64.efi
sudo makefs -d 6144 -t msdos -s 50m -Z efi.img efi
mkimg -s gpt -f raw \
	-p efi:=efi.img \
	-p freebsd-swap/swapfs::1G \
	-p freebsd-ufs/rootfs:=ufs.img \
	-o ${OUTPUT_IMG_NAME}

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