Re: [Qemu-devel] TCG on PowerPC arch

["Hollis Blanchard" <hollis@penguinppc.org>]

To summarize, you're saying that the only way you're able to test the
EMAC patch is with a custom firmware you can't make public? Obviously
that's not ideal, but I think some EMAC emulation is better than none
at all, so IMHO that shouldn't necessarily block your patch.

The problem I had when trying to test qemu's 405 emulation was that
Linux needed firmware to load it, and no 405 firmware is distributed
with qemu. At the time, Jocelyn claimed we could download a binary
uboot image from AMCC, but that didn't actually work. (I think we
ended up using http://www.amcc.com/Embedded/Downloads/download.html?item=129&start=y).
This was probably a year ago, so details are fuzzy now.

However, if you have access to a 440 board, you could use KVM
(http://kvm.qumranet.com/kvmwiki/PowerPc) to boot a guest kernel with
the EMAC driver and test that way. Qemu's instruction emulation
doesn't support 440, but KVM implements all the instruction emulation
itself and does run on 440.

Anyways, I definitely think it's worthwhile to update your patch to current SVN.

-Hollis

On Thu, Oct 30, 2008 at 3:53 AM, Salvatore Lionetti
<salvatorelionetti@yahoo.it> wrote:
> Hi Hollis,
>
> please excuse me, but i can't release my firmware (based on OSE)
> If you agree, i'd like to
> - catch svn status to test emac for my 405 based board, custom fw
> - compile a linux kernel for ppc405 cpu, with emac driver
> (i've trying eCos but no emac driver :(0)
>
> For first step actually have some pb with proxy script.
> The second one is not strictly depend on me, but 'm very glad if anybody do it. Moreover emac driver in our custom firmware only used reversed mii, and is not well written code!  so however i'd like to use another os.
> Moreover the emac device is tested only with such driver so i expect some pb during porting, so excuse in advance if some pb could arise.
>
> Have a good day
> Salvatore
>
> --- Mer 29/10/08, Hollis Blanchard <hollis@penguinppc.org> ha scritto:
>
>> Da: Hollis Blanchard <hollis@penguinppc.org>
>> Oggetto: Re: [Qemu-devel] TCG on PowerPC arch
>> A: qemu-devel@nongnu.org
>> Cc: salvatorelionetti@yahoo.it
>> Data: Mercoledì 29 ottobre 2008, 16:15
>> On Tue, Oct 28, 2008 at 3:41 PM, Andreas Färber
>> <andreas.faerber@web.de> wrote:
>> >
>> > How did you actually use and test your eMac emulation?
>> I assume you did not
>> > use a PReP Linux kernel for that? If you could provide
>> some details, that
>> > might help with testing the TCG conversion too.
>>
>> (Just in case there's any confusion, EMAC is the name
>> for the ethernet
>> controller on IBM's 405- and 440-based SoCs, not to be
>> confused with
>> Apple's eMac product.)
>>
>> Salvatore, did you use a 405 Linux kernel with the EMAC
>> driver to test
>> this patch? If so, how exactly did you boot? What did you
>> do for
>> firmware?
>>
>> -Hollis
>
>
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