Re: How can I help?

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Chris Stromblad wrote:
> Hi again,
>
> Exactly how can I disable the bootsplash? 

Install/boot with -no-kvm, then edit the grub configuration file.  The 
details vary, and I'm not sure how to do it on Ubuntu.


> And out of curiosity, why is
> that preventing KVM/QEMU from working properly?
>   

kvm uses vm86 mode to virtualize real mode.  Some boot loaders use 
features of real mode which are not present (or not identical to) vm86 mode.

One day we will emulate real mode (or use a combination of vm86 and 
emulation) which will fix the problem.

> / Chris
>
> On Sun, 2007-02-25 at 11:39 +0200, Avi Kivity wrote:
>   
>> Chris Stromblad wrote:
>>     
>>> Few years ago I did a fair bit of x86 programming, but with the more
>>> recent CPUs and all the new instructions, I'd probably be bit out of it.
>>> Then again, wouldn't hurt having a look at it... who knows, maybe in a
>>> few years I could actually do something ;)
>>>
>>>   
>>>       
>> x86 experience definitely helps.  You might want to download the latest 
>> Intel and AMD documentation and check out the relevant chapters.  For 
>> Intel, that's chapters 20-25 in the software developer's manual, volume 3B.
>>
>> Actually knowing all the instructions isn't that important; it's the 
>> general quirkiness of the arch that needs to be understood.
>>
>>
>>     
>>> The problem.
>>>
>>> Basically I get the problem immediately when attempting to boot from an
>>> ISO image (the installation step). The image is a UBUNTU x86_64
>>> installation disk. Pretty much instantly when I attempt to boot the
>>> window flashes by and in the original window I get the CPU reg dump with
>>> the exception 12.
>>>   
>>>       
>> Ok.  That's definitely the real-mode emulation problem we have on 
>> Intel.  You might try installing using qemu, and disabling any boot 
>> loader splashscreens (I don't know the exact syntax required), and 
>> restarting under kvm.
>>
>>     
>
>
>   


-- 
error compiling committee.c: too many arguments to function


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