configs/hifive_unleashed: use mainline Linux + U-Boot
Update to use the official linux kernel v5.10 instead of an
out-of-tree kernel, and use the official U-Boot v2021.01 as the
bootloader. Provide two configuration files of genimage for different
boot flows:
- Boot from SD card (default)
- Boot from SPI flash
A boot script is generated to automatically boot the distro.
Signed-off-by: Bin Meng <[email protected]>
Reviewed-by: Alistair Francis <[email protected]>
Signed-off-by: Thomas Petazzoni <[email protected]>