108751 – amd64 2005.1 default kernel lacks IOMMU support; breaks w/ >4GB RAM

Bug 108751 - amd64 2005.1 default kernel lacks IOMMU support; breaks w/ >4GB RAM

Summary: amd64 2005.1 default kernel lacks IOMMU support; breaks w/ >4GB RAM

Status:	RESOLVED FIXED

Alias:	None

Product:	Gentoo Release Media
Classification:	Unclassified
Component:	Everything (show other bugs)
Hardware:	All Linux

Importance:	High normal (vote)
Assignee:	Gentoo Release Team

URL:
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Keywords:	InVCS

Depends on:
Blocks:

Reported:	2005-10-10 11:48 UTC by Charles Duffy
Modified:	2005-11-21 06:52 UTC (History)
CC List:	0 users

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Runtime testing required:	---

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Description Charles Duffy 2005-10-10 11:48:55 UTC

I'm running an AMD64 system with 16GB of RAM. Booting the 2005.1 Universal
LiveCD via a USB CD-ROM device, I note a warning that 32-bit PCI device support
may be unreliable due to running with >4GB RAM on a kernel lacking IOMMU
support, followed by an Oops in khubd, leading to said USB device being
unavailable to chroot to. Booting with mem=2048m works around the issue.

Perhaps amd64 LiveCDs should have kernels with IOMMU support?

Reproducible: Always
Steps to Reproduce:
1. Boot off 2005.1 Universal LiveCD via USB drive on amd64 system w/ >4MB RAM
2. Watch it fail to boot. Press enter to get a shell when prompted for root device.
3. Run "dmesg". Observe warning (that PCI devices may not work correctly w/ >4GB
RAM and no IOMMU support) and Oops.

Comment 1 Chris Gianelloni (RETIRED) gentoo-dev

2005-11-21 06:52:02 UTC

This is fixed with the 2005.1-r1 release media.