On Fri, Jun 07, 2019 at 05:03:42PM -0700, Palmer Dabbelt wrote:
> On Thu, 06 Jun 2019 16:22:47 PDT (-0700), alistai...@gmail.com wrote:
> > Hello,
> >
> > As a test of the waters, how would the QEMU community feel about
> > including the RISC-V OpenSBI project as a ROM submodule?
> >
> > The idea would be to have OpenSBI (similar to ATF for ARM and a BIOS
> > for x86) included by default to simplify the QEMU RISC-V boot process
> > for users. This would remove the requirement for users/developers to
> > build a RISC-V firmware. The goal here is to allow people to just
> > download and run their kernel as easily as they currently do for x86.
> >
> > We would make sure that it can be disabled! That is users/developers
> > can use their own (or none) if they want to. The idea here is just to
> > simplify the boot process, not lock anyone out.
>
> I like it. My only question is about the mechanics of doing so: are we just
> going to assume there's a cross compiler in PATH? I guess that's less of a
> usability headache than needing a complier and a firmware.
Usual way to add firmware:
(1) Add a submodule below roms/
(2) Add rules to build the firmware to roms/Makefile. Firmware
maintainers can use them, and they also document the build process.
A normal qemu build will not automatically build the firmware
though.
(3) Place a pre-built binary in pc-bios/
There is some cross compiler detection logic in roms/Makefile which you
can use.
cheers,
Gerd
