[LinuxBIOS] Enabling APIC 82801xx

[joe at smittys.pointclark.net]

Quoting joe at smittys.pointclark.net:

> Quoting joe at smittys.pointclark.net:
>
>> 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

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 = 2000000
Set power on if power fails
RTC Init
PNP: 002e.4 init
PNP: 002e.7 init
PCI: 00:1f.1 init
IDE0 IDE1 PCI: 00:1f.3 init
Devices initialized
Copying IRQ routing tables to 0xf0000...done.
Verifing copy of IRQ routing tables at 0xf0000...done
Checking IRQ routing table consistency...
check_pirq_routing_table() - irq_routing_table located at: 0x000f0000
done.
Moving GDT to 0x500...ok
Adjust low_table_end from 0x00000530 to 0x00001000
Adjust rom_table_end from 0x000f0400 to 0x00100000
Wrote linuxbios table at: 00000530 - 000006d8  checksum 7e74

Welcome to elfboot, the open sourced starter.
January 2002, Eric Biederman.
Version 1.3