Description of problem: Install RHEL AS4 U3 64bit with more than 4G memory size.When system boot from OS installation CD1, then "Kernel Panic" occurs on kernel load. The message is âKernel Panic-not syncing" PCI-DMA: high address but no IOMMU.â There is a workaround to add "pic=nommconf" to disable MCFG table in installation option menu. Only happen on RH4, RH3 is ok. Version-Release number of selected component (if applicable): How reproducible: 1.Boot from installation CD1. 2.In install main menu, Press âenterâ to start installation. 3."Kernel Panic - not syncing: PCI-DMA: high address but no IOMMU" message pop up. Steps to Reproduce: 1.Boot from installation CD1. 2.In install main menu, Press âenterâ to start installation. 3."Kernel Panic - not syncing: PCI-DMA: high address but no IOMMU" message pop up. Actual results: Expected results: Hope this can be fixed in next build. Additional info:
Created attachment 127594 [details] Failure screenshot
Are you sure you are seeing this on IA64 and not on x86_64. The reason is that I did not see the panic("PCI-DMA: high address but no IOMMU.\n"); statement in arch/ia64 directory. However I saw this the above statement in arch/x86_64/kernel/pci-gart.c. Can you verify this and change the bug to appropriate architecture.
Sorry for mistake. I have changed the architecture to x86_64
What's the motherboard and which CPUs are you using?
It designed with nVidia MCP55P SB and AMD Opetron Dual core Socket F processor. It doesn't matter what cpu speed is.
Have you tried the latest RHEL4 U4 kernel on this configuration? I have the feeling this *might* be related to Bug 162977, which is fixed in the latest beta.
Closing as dup of 162977 *** This bug has been marked as a duplicate of 162977 ***