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dnl $OpenBSD: prep,v 1.5 2017/08/13 11:20:53 jsg Exp $
Please be aware that OpenBSD support for this platform is far from
complete.
To perform an installation you must be able to interact with the serial
console of the machine. USB OTG ports such as the one found on the
BeagleBone will not function as a console. You need to be able to
interact with the firmware on the console. Often this requires a 3.3V
TTL level adapter connected to pins or a header on the board.
Firmware which provides an EFI interface with a Device Tree Blob (DTB)
file is required to boot. In most cases this is provided by images of
U-Boot 2016.07 or newer on SD/MMC devices or in SPI flash. If the
miniroot images are used, U-Boot and DTB files are distributed as part
of the miniroot disk images.
OpenBSD can be installed onto a disk by copying the miniroot for your
board "miniroot{:--:}OSrev.fs" image to an SD card.
Booting from an SD card:
To use the miniroot image you will need another machine to plug the
SD card in to. Any machine type will do, as long as it supports SD card
storage devices. Under OpenBSD, it will appear as a ``sd'' device, for
example sd1.
Use the dd(1) utility to copy the miniroot to the hard drive.
The command would likely be, under OpenBSD:
dd if=miniroot{:--:}OSrev.fs of=/dev/rsd1c bs=1m
When you have connected the serial to you computer, a command such
as "cu -l cuaU0 -s 115200" (assuming cuaU0 is your serial port device)
should connect you to the board's console.
Running EFI payloads with U-Boot:
If the U-Boot target supports "distro_bootcmd" efiboot will automatically
be loaded by placing bootaa64.efi into /efi/boot/bootaa64.efi on a FAT
filesystem. With dtb files placed in in /, /dtbs/, or /dtb/current/.
If the U-Boot target supports bootefi but not automatically finding it with
"distro_bootcmd" then it must be loaded manually or by U-Boot commands or
script.
=> run findfdt
=> load mmc 0:1 ${fdt_addr_r} ${fdtfile}
=> load mmc 0:1 ${kernel_addr_r} efi/boot/bootaa64.efi
=> bootefi ${kernel_addr_r} ${fdt_addr_r}
The bootloader will then run and try to load sd0a:/bsd off an FFS
filesystem after a timeout.
Install on systems without a supported miniroot:
If a miniroot is not available for your system you will have to modify
an existing image before booting it.
To do so first install the u-boot-aarch64 and dtb packages. Write the
provided miniroot image to an SD card:
dd if=miniroot{:--:}OSrev.fs of=/dev/rsdXc bs=1m
Add a board specific DTB file:
mount /dev/sdXi /mnt
cp /usr/local/share/dtb/arm64/vendor/board.dtb /mnt/
umount /mnt
For systems based on Allwinner Axx Socs:
dd if=/usr/local/share/u-boot/board/u-boot-sunxi-with-spl.bin \
of=/dev/sdXc bs=1024 seek=8
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