[Qemu-devel] EFI BIOS on QEMU

[Qemu-devel] EFI BIOS on QEMU

[Kuniyasu Suzaki]

Hello,

We tried EFI BIOS on QEMU.
  http://bellard.org/qemu/efi-bios.tar.bz2

It' fine but the network is not effective. The "devices" command of EFI
does not find a NIC.
# Linux can not set up also network.

Please tell me how to solve this problem. I will re-compile EFI BIOS if necessary.

We want to try EFI toolkit on QEMU because EFI toolkit has many
commands for network. They were effective on EFI on IntelMac.
  https://efi-toolkit.tianocore.org/

------
suzaki

Re: [Qemu-devel] EFI BIOS on QEMU

[Tristan Gingold]

On Dec 6, 2007, at 5:58 AM, Kuniyasu Suzaki wrote:

>
> Hello,
>
> We tried EFI BIOS on QEMU.
>   http://bellard.org/qemu/efi-bios.tar.bz2
>
> It' fine but the network is not effective. The "devices" command of  
> EFI
> does not find a NIC.
> # Linux can not set up also network.
>
> Please tell me how to solve this problem. I will re-compile EFI  
> BIOS if necessary.

IIRC, tiano only support eepro100.  But I have never tested it.

Tristan.

Re: [Qemu-devel] EFI BIOS on QEMU

[Kuniyasu Suzaki]

Tristan,

 >>From: Tristan Gingold <gingold@adacore.com>
 >>Subject: Re: [Qemu-devel] EFI BIOS on QEMU
 >>
 >>IIRC, tiano only support eepro100.  But I have never tested it.

I see. I should try an e100 emulator on QEMU, if I want to use EFI on QMEU.

------
suzaki

Re: [Qemu-devel] EFI BIOS on QEMU

[Stefan Weil]

Hi,

I just wanted to run QEMU CVS with EFI BIOS:

i386-softmmu/qemu -snapshot -L efi-bios -hda efi-bios/efi.disk
linux.img  -net nic,model=i82551 -net user

i82551 is part of the E100 emulator (eepro100.c).

It does not work - no output on serial console nor VGA screen.
Or do I have to press some magic keys to get any response?

Stefan

Kuniyasu Suzaki schrieb:
> Tristan,
>
> >>From: Tristan Gingold <gingold@adacore.com>
> >>Subject: Re: [Qemu-devel] EFI BIOS on QEMU
> >>
> >>IIRC, tiano only support eepro100. But I have never tested it.
>
> I see. I should try an e100 emulator on QEMU, if I want to use EFI on
> QMEU.
>
> ------
> suzaki

Re: [Qemu-devel] EFI BIOS on QEMU

[Rob Landley]

On Monday 07 January 2008 14:19:27 Stefan Weil wrote:
> Hi,
>
> I just wanted to run QEMU CVS with EFI BIOS:
>
> i386-softmmu/qemu -snapshot -L efi-bios -hda efi-bios/efi.disk
> linux.img  -net nic,model=i82551 -net user
>
> i82551 is part of the E100 emulator (eepro100.c).
>
> It does not work - no output on serial console nor VGA screen.
> Or do I have to press some magic keys to get any response?

You tried ctrl-alt-2 to switch from vga to serial console?  (Wild guess...)

Where did this bios come from?

You are aware that bioses come in 2 stages, and that only the _second_ stage 
applies to something like qemu, right?

The first stage is hardware initialization.  Most importantly, BIOS stage 1 
has to initialize the DRAM controller and start the periodic refresh timer, 
and then wait a bit for it to clock up before the DRAM can store stable 
values.  (The memory starts out holding random garbage, and until the refresh 
timer is working it won't hold on to values you write to it either.)

This sort of early hardware initialization is what the "linux bios" project 
does.  It's extremely system specific stuff that has to have hardwired into 
it exactly where all the devices it's talking to live because it can't do 
things like probe the PCI bus until you know where the PCI bus controller is 
(and have switched it on and booted it up).

This stage doesn't apply to qemu.  QEMU is only emulating hardware, it doesn't 
have things like DRAM refresh hardware, and if you try to play with that sort 
of thing you won't get back the right results because it's not _there_.  (In 
general, running a stage 1 BIOS for one machine on any other machine won't 
work unless the hardware is _identical_.  That's why Linux Bios has 8 
gazillion config options at build time for which board you're building it 
for.)

The second stage of the BIOS provides an API to userspace, called by things 
like bootloaders to load sectors from the boot device into memory.  For the 
x86 and x86-64 targets QEMU uses the bochs bios to provide this interface, 
for bootloaders like grub.  That's already there.

Could you tell us more about what exactly you're trying to do?

Rob
-- 
"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.

Re: [Qemu-devel] EFI BIOS on QEMU

[Stefan Weil]

Rob Landley schrieb:
> On Monday 07 January 2008 14:19:27 Stefan Weil wrote:
>> Hi,
>>
>> I just wanted to run QEMU CVS with EFI BIOS:
>>
>> i386-softmmu/qemu -snapshot -L efi-bios -hda efi-bios/efi.disk
>> linux.img -net nic,model=i82551 -net user
>>
>> i82551 is part of the E100 emulator (eepro100.c).
>>
>> It does not work - no output on serial console nor VGA screen.
> You tried ctrl-alt-2 to switch from vga to serial console? (Wild guess...)
>
> Where did this bios come from?
> ...
> Could you tell us more about what exactly you're trying to do?
>
> Rob

Hi Rob,

thank you for your answer. I'm sorry that it took some time until I could
come back to this topic. Here is more information on what I was trying to do
(which still does not work).

I heared from Tristan's mail that EFI BIOS network functions only support
eepro100 hardware. Well, I wrote the eepro100 emulation for QEMU, so
I wanted to see this working.

So, I compiled i386-softmmu/qemu from QEMU svn trunk, got
http://fabrice.bellard.free.fr/qemu/linux-0.2.img.bz2 and
http://fabrice.bellard.free.fr/qemu/efi-bios.tar.bz2, unpacked both
files, and finally had this directory:

$ ls -l efi-bios/
insgesamt 24712
-rw-r--r-- 1 stefan stefan  1048576  4. Mär 2007  bios.bin
-rw-r--r-- 1 stefan stefan  3145728  4. Mär 2007  efi.disk
-rw-r--r-- 1 stefan stefan 20971520 26. Apr 16:47 linux-0.2.img
-rw-r--r-- 1 stefan stefan      923  4. Mär 2007  README
-rw-r--r-- 1 stefan stefan    35328 26. Apr 13:18 vgabios-cirrus.bin

vgabios-cirrus.bin is a copy from qemu/trunk/pc-bios.

Now, I started this command:

i386-softmmu/qemu -snapshot -hda efi-bios/efi.disk -hdb 
efi-bios/linux-0.2.img -L efi-bios

Result: no output in VGA console, no output (beside serial0 console) in 
serial console.
Of course I did not try ctrl-alt-2 to switch to the serial console (this 
selects the monitor
console), but ctrl-alt-3.

Obviously, some earlier CVS revisions had worked. So I started with QEMU 
CVS of
2007-03, and it worked! Up to now, I could narrow the change from 
working to no
longer working to the time interval from 2007-10-07 to 2007-10-13.

Stefan

Re: [Qemu-devel] EFI BIOS on QEMU

[Rob Landley]

On Saturday 26 April 2008 11:11:03 Stefan Weil wrote:
> Obviously, some earlier CVS revisions had worked. So I started with QEMU
> CVS of
> 2007-03, and it worked! Up to now, I could narrow the change from
> working to no
> longer working to the time interval from 2007-10-07 to 2007-10-13.

Now that QEMU has moved to a subversion archive, you should be able use that 
to binary search through the available revisions...

Don't ask me why the download page on qemu.org doesn't mention the repository, 
nor why the links page still says "cvs" and the project page it links to on 
savannah still says CVS...

The conversion request was here:
https://savannah.gnu.org/support/?106278

The announcement was here:
http://lists.gnu.org/archive/html/qemu-devel/2008-03/msg00495.html

> Stefan

Rob
-- 
"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.

Re: [Qemu-devel] EFI BIOS on QEMU

[Stefan Weil]

Rob Landley schrieb:
> Now that QEMU has moved to a subversion archive, you should be able use that 
> to binary search through the available revisions...
>   
> Rob
>   
So I did. EFI BIOS stopped working with qemu/trunk r3371.
See my previous mail for details.

Stefan

Re: [Qemu-devel] EFI BIOS on QEMU

[Tristan Gingold]

On Jan 7, 2008, at 9:19 PM, Stefan Weil wrote:

> Hi,
>
> I just wanted to run QEMU CVS with EFI BIOS:
>
> i386-softmmu/qemu -snapshot -L efi-bios -hda efi-bios/efi.disk
> linux.img  -net nic,model=i82551 -net user
>
> i82551 is part of the E100 emulator (eepro100.c).
>
> It does not work - no output on serial console nor VGA screen.
> Or do I have to press some magic keys to get any response?

EFI Bios worked once with Qemu (around Feb 2007), so certainly  
something was broken.

Happy debugging ;-)

Re: [Qemu-devel][BUG] EFI BIOS on QEMU stopped working with r3371

[Stefan Weil]

Tristan Gingold schrieb:
> EFI Bios worked once with Qemu (around Feb 2007), so certainly 
> something was broken.
>
> Happy debugging ;-)

Thanks. EFI BIOS stopped working with qemu/trunk r3371. From the change log:

------------------------------------------------------------------------
r3371 | ths | 2007-10-09 05:08:56 +0200 (Di, 09 Okt 2007) | 3 lines

Don't route PIC interrupts through the local APIC if the local APIC
config says so. By Ari Kivity.

------------------------------------------------------------------------

The bug comes from function pic_irq_request in pc.c.
I can fix it for r3371 by adding cpu_reset_interrupt (like in r3370),
but the code in the current trunk is totally different.

Could the pic experts please have a look?

Stefan

Re: [Qemu-devel][BUG] Regression: EFI BIOS on QEMU stopped working with r3371

[Stefan Weil]

Stefan Weil schrieb:
> Thanks. EFI BIOS stopped working with qemu/trunk r3371. From the 
> change log:
>
> ------------------------------------------------------------------------
> r3371 | ths | 2007-10-09 05:08:56 +0200 (Di, 09 Okt 2007) | 3 lines
>
> Don't route PIC interrupts through the local APIC if the local APIC
> config says so. By Ari Kivity.
>
> ------------------------------------------------------------------------
>
> The bug comes from function pic_irq_request in pc.c.
> I can fix it for r3371 by adding cpu_reset_interrupt (like in r3370),
> but the code in the current trunk is totally different.
>
> Could the pic experts please have a look?
>
> Stefan
Is there nobody interested in getting this regression fixed?
What is the equivalent to cpu_reset_interrupt in Qemu's current code?

Regards,
Stefan