Re: [Qemu-devel] RISC-V: Include ROM in QEMU

[Alistair Francis]

On Mon, Jun 10, 2019 at 11:30 PM Gerd Hoffmann <address@hidden> wrote:
>
> On Fri, Jun 07, 2019 at 05:03:42PM -0700, Palmer Dabbelt wrote:
> > On Thu, 06 Jun 2019 16:22:47 PDT (-0700), address@hidden 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.

Thanks for the info. I have it all working now, just running a few
more tests. I will send my patches out today or tomorrow.

Alistair

>
> cheers,
>   Gerd
>