UEFI bootloader that allows to load Unicycle application directly, without any support from operating system like Linux. This bootloader implements Uniboot protocol on top of UEFI specification.
The bootloader supports booting from the same bootable device where bootloader.efi is located or loading from network using TFTP protocol.
While booting from the disk is one of the possible options it requires generating and reflashing images to disk/USB stick every time the Unicycle application is modified. Such workflow makes it harder to do quick iterative development.
To help to increase development speed this bootloader supports booting over the network. The idea is derived from Zircon project and shares many implementation details. Once the device boots it sends a multicast request to check whether the network has a bootserver running. And if it has one it downloads the application binary file over TFTP and loads it into the device memory.
To enable network-based boot process one needs to make sure the test device UEFI configured with network enabled then bootserver need to be run at the host.
To build UEFI bootloader binary please run
make
To create a bootable image please build bootloader using instructions above.
Then update bootloader config file bootloader.cfg to choose whether you prefer over-the-network or from-disk application boot.
Once you completed please run:
sudo image_generate.sh
At the end you'll get boot.img that is suitable for flashing to a disk or USB flash stick:
sudo dd if=boot.img of=/dev/sdXXXX
sdXXXX - device disk for your bootable device. You can find the name using lsblk tool.