NetBSD hdd-boot

sandpoint/installation/altboot.img and sandpoint/binary/kernel/netbsd-INSTALL.gz

1. Flash altboot.img u-boot image as kernel using this guide.
2. Setup tftp server to serve netbsd-INSTALL file.
3. Reboot.
4. Enter altboot interactive mode by interrupting altboot.
5. Boot installation kernel using tftp:netbsd-INSTALL command.
6. Install NetBSD to wd0a device.
7. Reboot.

Official guide