Re: [Qemu-devel] Support for BMIPS4380 CPU?

[Aurelien Jarno]

On Sun, Feb 06, 2011 at 05:20:54PM +0100, xeros wrote:
> On Fri, 4 Feb 2011, Aurelien Jarno wrote:
>
>> On Thu, Feb 03, 2011 at 10:05:36AM +0100, xeros wrote:
>>> Hi,
>>
>> Hi,
>>
>>> I'd like to ask about support for newer CPUs in QEMU, like this one:
>>> system type             : BCM3556C0 DTV platform
>>> processor               : 0
>>> cpu model               : Broadcom BMIPS4380 V4.4  FPU V0.1
>>> BogoMIPS                : 403.45
>>> wait instruction        : yes
>>> microsecond timers      : yes
>>> tlb_entries             : 32
>>> extra interrupt vector  : yes
>>> hardware watchpoint     : no
>>> ASEs implemented        : mips16
>>> shadow register sets    : 1
>>> core                    : 0
>>> VCED exceptions         : not available
>>> VCEI exceptions         : not available
>>>
>>> processor               : 1
>>> cpu model               : Broadcom BMIPS4380 V4.4  FPU V0.1
>>> BogoMIPS                : 403.45
>>> wait instruction        : yes
>>> microsecond timers      : yes
>>> tlb_entries             : 32
>>> extra interrupt vector  : yes
>>> hardware watchpoint     : no
>>> ASEs implemented        : mips16
>>> shadow register sets    : 1
>>> core                    : 0
>>> VCED exceptions         : not available
>>> VCEI exceptions         : not available
>>>
>>> I've tried all the available -cpu and -M options combinations (in
>>> QEMU from 0.11 to 0.13) but still no luck to even start booting the
>>> Linux kernel compiled for this CPU.
>>> When I boot the other Linux system image prepared for 'malta'
>>> machine and try to run any even static compiled binaries from
>>> machine which uses the not yet supported CPU I get 'Illegal
>>> instruction' message.
>>>
>>> 'file' command output on such binaries is:
>>> busybox: ELF 32-bit LSB executable, MIPS, MIPS32 version 1 (SYSV),
>>> statically linked, stripped
>>>
>>> While the ones compiled for system in 'malta' QEMU virtual machine is:
>>> busybox-orig-qemu: ELF 32-bit LSB executable, MIPS, MIPS-I version 1
>>> (SYSV), statically linked, stripped
>>>
>>
>> You need to emulate a platform and a CPU matching your kernel. Currently
>> QEMU doesn't support this Broadcom CPU, nor this platform.
>>
>> Aurelien
>>
>
> Are there any plans for extending support for such CPUs or something  
> simmilar which could run the binaries compiled for such CPU?
>

I don't think there is an interest for such a platform given it is not
a very common platform, which doesn't means it can't be added if someone
wants to do the job.

About binaries, if you talk about userland binaries, you can run normal
binaries without problem with QEMU, provided you use the kernel 
corresponding to the emulated hardware.

If you talk about kernels, you obviously need to emulate the hardware
corresponding to your kernel.

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
address@hidden                 http://www.aurel32.net