Re: [culprit found] Re: [boot hang] 2.6.7-rc2, VIA VT8237

[David Ford]

Yep, that patch makes this thing bootable now :)

Thank you,
David

Andi Kleen wrote:

> David Ford <david+challenge-response@xxxxxxxxxxxxx> writes:
>
>  
>
> > Culprit found.  If CONFIG_IOMMU_DEBUG is enabled, the machine will
> > hang on boot at the partition check when using the VIA driver.
> >    
>
> The real culprit is buggy VIA silicon. Use this patch.
>
> -Andi
>
> ---------------------------------------------------------------
> Enable VIA softmmu workaround for iommu=force/IOMMU_DEBUG too
>
> diff -u linux-2.6.7rc3-bk3/arch/x86_64/kernel/io_apic.c-o linux-2.6.7rc3-bk3/arch/x86_64/kernel/io_apic.c
> --- linux-2.6.7rc3-bk3/arch/x86_64/kernel/io_apic.c-o	2004-06-11 03:02:42.000000000 +0200
> +++ linux-2.6.7rc3-bk3/arch/x86_64/kernel/io_apic.c	2004-06-12 15:46:35.000000000 +0200
> @@ -252,7 +252,8 @@
> 				switch (vendor) { 
> 				case PCI_VENDOR_ID_VIA:
> #ifdef CONFIG_GART_IOMMU
> -					if (end_pfn >= (0xffffffff>>PAGE_SHIFT) &&
> +					if ((end_pfn >= (0xffffffff>>PAGE_SHIFT) ||
> +					     force_iommu) &&
> 					    !iommu_aperture_allowed) {
> 						printk(KERN_INFO
>     "Looks like a VIA chipset. Disabling IOMMU. Overwrite with \"iommu=allowed\"\n");
>
>  
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