Building current kernel for Qemu

Building current kernel for Qemu

[David Daney]

I would like to build a current kernel for mipsel on qemu.  However it
seems that the qemu target was recently removed.

I tried building a plain malta kernel vmlinux, but there is no output on
the console when trying to boot it.  The Debian 2.6.18 qemu kernel seems
to work well though.

Do you have to do anything special to the kernel to run on qemu?

How does one go about building a kernel for qemu from current kernel
sources?

Thanks in advance for any insight into this,
David Daney

Re: Building current kernel for Qemu

[Thiemo Seufer]

David Daney wrote:
> I would like to build a current kernel for mipsel on qemu.  However it
> seems that the qemu target was recently removed.
> 
> I tried building a plain malta kernel vmlinux, but there is no output on
> the console when trying to boot it.  The Debian 2.6.18 qemu kernel seems
> to work well though.
> 
> Do you have to do anything special to the kernel to run on qemu?

Nothing special is needed for the kernel. You need to start with
e.g. "qemu-system-mipsel -M malta" to select Qemu's malta machine
emulation.

> How does one go about building a kernel for qemu from current kernel
> sources?

The special qemu kernel is now deprecated, as the malta kernel is a
full replacement which corresponds better to real existing hardware.

This is btw. also true for Qemu itself, the mips_r4k machine is still
there because
 a) uBoot supports it as the only mips Qemu target
 b) Some out-of-tree machine definitions use it as a baseline
    configuration.


Thiemo

Re: Building current kernel for Qemu

[David Daney]

Thiemo Seufer wrote:
> David Daney wrote:
>   
>> I would like to build a current kernel for mipsel on qemu.  However it
>> seems that the qemu target was recently removed.
>>
>> I tried building a plain malta kernel vmlinux, but there is no output on
>> the console when trying to boot it.  The Debian 2.6.18 qemu kernel seems
>> to work well though.
>>
>> Do you have to do anything special to the kernel to run on qemu?
>>     
>
> Nothing special is needed for the kernel. You need to start with
> e.g. "qemu-system-mipsel -M malta" to select Qemu's malta machine
> emulation.
>   
Thanks Thiemo,  the '-M malta' is all I was missing.  I am now running
with the current git tip.

David Daney