2.6.7-rc2, VIA VT8237

culprit found Andi Kleen 2 participants 2 messages Jun 12, 2004 5 messages not in the archive

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Andi Kleen

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2004-06-12 13:59 UTC #5 lore raw

Quoted 2 lines · David Ford

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

arch/x86_64/kernel/io_apic.c renamed from arch/x86_64/kernel/io_apic.c-o +2 -1

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
@@ -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");

David Ford

2004-06-12 18:14 UTC #6 lore raw

Yep, that patch makes this thing bootable now :)

Thank you,
David

Quoted 23 lines · Andi Kleen

Quoted 4 lines · David Ford
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

arch/x86_64/kernel/io_apic.c line 259

Quoted 9 lines

arch/x86_64/kernel/io_apic.c renamed from arch/x86_64/kernel/io_apic.c-o +2 -1

@@ -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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email;internet:[email protected]
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tel;cell:(203) 650-3611
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