[PATCH 00/28] Initial implementation of bootmethod/bootflow

[Mark Kettenis]

> From: Peter Robinson <pbrobinson at gmail.com>
> Date: Wed, 25 Aug 2021 14:29:45 +0100
> 
> > > Exactly. Keep in mind that RISC-V is looking into EBBR as well,
> > > so this is far from an 'Arm thing'. Moreover, the efi stub side
> > > of the kernel for risc-v, will only load an initrd using the
> > > EFI_LOAD_FILE2 protocol we added support for. So right now the
> > > only way to properly boot a RISC-V with EFI is through the
> > > manager.
> >
> > I had heard that RISC-V was just going to use UEFI (and not U-Boot),
> > but perhaps that is not correct. So far I have not really done
> > anything with RISC-V so am not familiar with it.
> 
> My understanding is the intention is to just use UEFI of which U-Boot
> has a UEFI implementation.

The HiFive Unmatched ships with U-Boot.  I'm booting OpenBSD via UEFI
on that board by using the uSD card that came with the board.

The folks pushing the spec for RISC-V server hardware are probably
considering a more traditional UEFI implementation for those systems
since they also seem to be pushing for ACPI.  But they explicitly
mention EBBR for "embedded" systems, and EBBR was deliberately
designed to allow the implementation of compliant systems using
U-Boot's UEFI implementation.