Re: [Qemu-devel] [ANNOUNCE] qemu-test: a set of tests scripts for QEMU

[Anthony Liguori <anthony@codemonkey.ws>]

On 12/30/2011 09:43 AM, Andreas Färber wrote:
> Am 29.12.2011 23:30, schrieb Anthony Liguori:
>> On 12/29/2011 04:10 PM, Peter Maydell wrote:
>>> How does your framework deal with non-x86 targets?
>>
>> http://git.qemu.org/qemu-jeos.git
>>
>> I've already got ppc32 support working.  Adding a new arch is just a
>> matter of adding a kernel config and uClibc config to configs/
>>
>>> Finding and
>>> installing a working crosscompiler can be painful, especially if
>>> you wanted to crosscompile userspace rather than just the kernel...
>>
>> I spent a couple days researching what to do here and ended up settling on:
>>
>> 1) build binutils for desired target
>>
>> 2) build GCC using (1) as a cross compiler.  This is a limited form of
>> GCC (no thread support) targeted as uClibc
>>
>> 3) build kernel using (2) and installer headers into our new sysroot
>>
>> 4) build uClibc using (2) and (3)
>>
>> 5) build busybox using (2) and (4)
>>
>> The whole process takes about 30 minutes on my laptop using -j1 which
>> isn't all that bad.  It's certainly faster than doing a distro install
>> with TCG :-)
>>
>> qemu-jeos.git contains git submodules for binutils, GCC, linux, uClibc,
>> and busybox plus miscellaneous scripts needed to make a working initramfs.
>
> "One ring to rule them all ... and in the darkness bind them"? ;)
>
> Seriously, what you describe may work for mainstream targets. But for
> new targets the trouble starts with 1) already: which binutils? The
> latest stable may not work for all architectures yet, so a generic
> submodule approach is doomed to fail.

Let's not speculate here..  There's already an existence proof that this 
approach works for most of the targets we support (Aboriginal Linux).

> Will uClibc work for all targets? There's glibc, eglibc, newlib, ...
>
> Not all targets have a softmmu at this time: unicore32
> (Fwiw this also means no testing outside Linux hosts.)
>
> There's no requirement that the Linux kernel must have been ported to a
> QEMU target yet or that it is still in mainline or that what is in
> mainline is complete enough for our testing.

Yes, but this just becomes the exception to prove the rule.

Regards,

Anthony Liguori