Re: [LinuxBIOS] Enabling APIC 82801xx

Quoting Marc Jones :
> [e-mail] wrote:
> > Quoting [e-mail]:
> > > Quoting [e-mail]:
> > > > OK, I have a new booting problem. LB dies on the
> > > > i82801xx_enable_ioapic() function in 82801xx_lpc.c:
> > > >
> > > > void i82801xx_enable_ioapic(struct device *dev)
> > > > {
> > > >    uint32_t reg32;
> > > >    volatile uint32_t *ioapic_index = (volatile uint32_t *)0xfec00000;
> > > >    volatile uint32_t *ioapic_data = (volatile uint32_t *)0xfec00010;
> > > >
> > > > reg32 = pci_read_config32(dev, GEN_CNTL);
> > > >    reg32 |= (3 << 7);	/* Enable IOAPIC */
> > > >    reg32 |= (1 << 13);	/* Coprocessor error enable */
> > > >    reg32 |= (1 << 1);	/* Delayed transaction enable */
> > > >    reg32 |= (1 << 2);	/* DMA collection buffer enable */
> > > >    pci_write_config32(dev, GEN_CNTL, reg32);
> > > >    printk_debug("IOAPIC Southbridge enabled %x\n", reg32);
> > > >
> > > > *ioapic_index = 0;
> > > >    *ioapic_data = (1 << 25);
> > > >
> > > > *ioapic_index = 0;
> > > >    reg32 = *ioapic_data;
> > > >    printk_debug("Southbridge APIC ID = %x\n", reg32);
> > > >    if (reg32 != (1 << 25))
> > > >    	die("APIC Error\n");
> > > >
> > > > /* TODO: From i82801ca, needed/useful on other ICH? */
> > > >    *ioapic_index = 3;	// Select Boot Configuration register
> > > >    *ioapic_data = 1;	// Use Processor System Bus to deliver interrupts
> > > > }
> > > >
> > > > Initializing devices...
> > > > Root Device init
> > > > PCI: 00:00.0 init
> > > > Northbridge init
> > > > PCI: 00:1d.0 init
> > > > PCI: 00:1d.1 init
> > > > PCI: 00:1d.2 init
> > > > PCI: 00:1d.7 init
> > > > EHCI: Setting up controller.. done.
> > > > PCI: 00:1e.0 init
> > > > PCI: 00:1f.0 init
> > > > IOAPIC Southbridge enabled 2186
> > > > Southbridge APIC ID = 0
> > > > APIC Error
> > > >
> > > > What is going on here? Why is *ioapic_data coming back as 0x0 after it
> > > > has been set to 0x2000000 (1 << 25)? Help?
> > >
> > > Hmm. Could this be because *ioapic_data is not able to use the memory
> > > space at 0xfec00010?? I also noticed in the bootlog the AC'97 Audio
> > > Controller is using this memory space:
> > >
> > > PCI: 00:1f.0 assign_resources, bus 0 link: 0
> > > PCI: 00:1f.5 1c <- [0x00fec00000 - 0x00fec000ff] mem
> > >
> > > Could this be causing the issue? If so how would I tell the AC'97
> > > Audio Controller to use a different memory space?
> >
> > Yup I was right, I disabled the AC'97 Audio Controller and it   
> > booted  right up. Now I just have to figure out why the ac'97 audio  
> >  is using  this memory space and how to chage it. Anyone....Help?
> >
> > Thanks - Joe
>
> That is strange. In devices\device.c:
>  #define DEVICE_MEM_HIGH 0xFEBFFFFFUL
>
> There shouldn't be any PCI devices allocated at 0xFEC0_0000.
>
> Marc

Think I figured it out but I'm not sure why. Looking back through my  
many bootlogs it looks like when I have the

device pci 2.0 off end # VGA compatible controller: Intel Corporation  
82830 CGC

enabled it does not allocate the 0x00fec00000 - 0x00fec000ff memory  
range. Is this because the VGA controller prefetches memory first?? Or  
is this just a wacky Intel thing?

Thanks - Joe