Re: [Xen-devel] Re: Continuing problems booting

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Gerd Hoffmann wrote:
> Jeremy Fitzhardinge wrote:
>   
> > Gerd Hoffmann wrote:
> > Hm.  You should see "XEN PAGETABLES" in the early reservations, which
> > should protect them from then on.  Oh, look, its only doing it in the
> > 64-bit setup.
> >     
> I see it is fixed in latest git.
>
> Now the i386 machine shows other issues, device drivers fail to
> register, errno 38 (ENOSYS).  Huh?  Also Shift-PgUp doesn't work, which
> makes me think it is an interrupt issue.  APCI-less box.  The x86_64
> machine (with IO-APIC) is doing fine.
>   
Hm.  I was not really planning on supporting no-ACPI; I've only hooked 
acpi_register_gsi, which is called via acpi_pci_irq_enable.  I guess 
you'd need to do something in pirq_enable_irq as well, and I'm not sure 
if all the stuff gets set up properly for IO_APIC_get_PCI_irq_vector to 
work.
> I can watch the cursor moving, just no characters appear on the screen.
>  Maybe some I/O port access issue?  So the color palette is foobar and
> it prints black on black?
>   
Yes, that's what I see too.  I spent some time staring at the vga 
framebuffer mapping and I can't see anything wrong with it at all - and 
I think the vga code can see its own framebuffer because it actually 
tests to see if it can write and read back from it.
The fact that the cursor moves around suggests that IO ports are the 
only thing that *are* working, but perhaps the io bitmap is coming in to 
play (hm, there's the ring 1 vs ring 3 difference between 32 and 64 bit).
Aside from that, there's the palette, as you suggested, and the 
character generator might be all empty too, I guess.
Also, when I try to start X it just spins there allocating memory until 
everything falls over (used to crash, before the pagetable reservation 
fix).  I'm guessing its related, but I haven't looked into it yet.
   J

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