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Re: [Qemu-devel] [6064] Implement device tree support needed for Bamboo
From: |
Hollis Blanchard |
Subject: |
Re: [Qemu-devel] [6064] Implement device tree support needed for Bamboo emulation |
Date: |
Tue, 16 Dec 2008 15:09:47 +0000 |
On Tue, 2008-12-16 at 12:30 +0000, Paul Brook wrote:
> > To implement the -kernel, -initrd, and -append options, 4xx board emulation
> > must load the guest kernel as if firmware had loaded it. Where u-boot would
> > be the firmware, we must load the flat device tree into memory and set key
> > fields such as /chosen/bootargs.
>
> Then why is it optional?
As you mention below, libfdt isn't generally available yet, and since
it's possible to make a real firmware work in this environment (in which
case -kernel isn't needed), the code can still be useful.
If you'd prefer to make libfdt mandatory, I'm fine with that.
> > This patch introduces a dependency on libfdt for flat device tree support.
>
> I don't like the way this is done.
>
> AFAIK libfdt isn't present in any of the major distros. I thought the
> conclusion was that we should import libfdt into qemu.
That was our conclusion, but Anthony never agreed.
FWIW, I have requested that Fedora and Debian package libfdt, and they
agreed in principle, but it's still missing in Fedora 10 for example.
Is the existence of distribution packages a requirement for use, or
should we say "install it by hand into /usr/local"? If it is a
requirement, which versions of which distributions?
> Certainly adding libfdt_env.h, which is never used, seems very wrong. I'm
> pretty sure this won't build on win32 either.
Oops, that was a holdover from when we *were* importing libfdt source. I
can remove that, or if we want to import a copy of libfdt, I can leave
it.
I doubt anyone has tried to build libfdt on Windows...
--
Hollis Blanchard
IBM Linux Technology Center
- [Qemu-devel] [6064] Implement device tree support needed for Bamboo emulation, Aurelien Jarno, 2008/12/16
- Re: [Qemu-devel] [6064] Implement device tree support needed for Bamboo emulation, Paul Brook, 2008/12/16
- Re: [Qemu-devel] [6064] Implement device tree support needed for Bamboo emulation,
Hollis Blanchard <=
- Re: [Qemu-devel] [6064] Implement device tree support needed for Bamboo emulation, Paul Brook, 2008/12/16
- Re: [Qemu-devel] [6064] Implement device tree support needed for Bamboo emulation, Daniel P. Berrange, 2008/12/16
- Re: [Qemu-devel] [6064] Implement device tree support needed for Bamboo emulation, Hollis Blanchard, 2008/12/16
- Re: [Qemu-devel] [6064] Implement device tree support needed for Bamboo emulation, Josh Boyer, 2008/12/16