Re: [Qemu-devel] Re: EFI console stopped working in Qemu 0.14.0

[Isaku Yamahata <yamahata@valinux.co.jp>]

On Thu, Mar 03, 2011 at 12:03:53PM +0900, Isaku Yamahata wrote:
> Hi. Thank you for reporting.
> Can you elaborate on the changeset that you pointed out and
> your work around?
> 
> Regarding to the changeset, it had the issue, but I suppose
> 80376c3fc2c38fdd45354e4b0eb45031f35587ed fixed it.
> Do you found any other issue?
> 
> Regarding to your workaround, what was the problem?
> What EFI BIOS are you using? Tiano-core derivatives that
> Tristan Gingold worked on? Or other one?
> It seems your EFI BIOS doesn't enable memor, io or master bits
> in command register.

or disableintx.

> If so, the issue is in the bios, not qemu.
> 
> thanks,
> 
> On Wed, Mar 02, 2011 at 11:27:31PM +0200, vagran wrote:
> > vagran wrote:
> >> Hi,
> >> I have noted that Qemu VGA and serial console with EFI BIOS stopped  
> >> working in
> >> 0.14.0 (and in latest development snapshot is still not working).  
> >> Everything was
> >> fine in 0.13.0. However EFI BIOS itself is able to load kernel if it was
> >> properly configured on used disk image. The only effect is that  
> >> neither VGA nor
> >> serial console is not functioning. After short investigation I have  
> >> discovered
> >> that this functionality was broken by this commit:
> >>
> >> commit 9bb3358627d87d8de25fb41b7276575539d799a7
> >> Author: Isaku Yamahata <yamahata@valinux.co.jp>
> >> Date:   Fri Nov 19 18:56:02 2010 +0900
> >>
> >> Do you have any idea how this change could affect EFI consoles?
> >>
> > After further investigation I have found that the following patch provides
> > a workaround for the problem, may be it could be useful for somebody who
> > is more familiar with Qemu PCI code:
> >
> > diff --git a/hw/pci.c b/hw/pci.c
> > index 8b76cea..06dd7ab 100644
> > --- a/hw/pci.c
> > +++ b/hw/pci.c
> > @@ -162,9 +162,11 @@ void pci_device_reset(PCIDevice *dev)
> >     pci_update_irq_status(dev);
> >     pci_device_deassert_intx(dev);
> >     /* Clear all writeable bits */
> > +#if 0
> >     pci_word_test_and_clear_mask(dev->config + PCI_COMMAND,
> >                                  pci_get_word(dev->wmask + PCI_COMMAND) |
> >                                  pci_get_word(dev->w1cmask + PCI_COMMAND));
> > +#endif
> >     pci_word_test_and_clear_mask(dev->config + PCI_STATUS,
> >                                  pci_get_word(dev->wmask + PCI_STATUS) |
> >                                  pci_get_word(dev->w1cmask + PCI_STATUS));
> >
> > Best regards,
> > Artyom.
> >
> >
> 
> -- 
> yamahata
> 

-- 
yamahata