On Thu, 2011-04-21 at 22:53 +0200, Robin Axelsson wrote: > On 2011-04-21 21:22, Ben Hutchings wrote: > > On Thu, Apr 21, 2011 at 09:05:14PM +0200, Robin Axelsson wrote: > >> On 2011-04-21 20:03, Debian Bug Tracking System wrote: > >>> n Thu, Apr 21, 2011 at 05:41:29PM +0200, Robin Axelsson wrote: > >>>>> Package: Debian-testing-amd64-DC-1.iso (latest version converted to > >>>>> boot > >>>>> USB) > >>>>> Severity: Critical > >>>>> Platform: x86_64 Linux (also .386/i686) > >>>>> > Description of problem: > >>>>> Since I updated the firmware of my BIOS to a revision that supports > >>>>> AMD > >>>>> IOMMU and turned that feature on, pretty much anything that runs > >>>>> Linux fails to boot All I see about half a second after I pass the > >>>>> GRUB bootloader is a blinking cursor in the upper left corner. The > >>>>> mouse gets disabled (i.e. powered off in spite of being plugged in) > >>>>> and the keyboard doesn't even respond to caps-lock, num-lock and > >>>>> scroll-lock toggles (numlock light is constantly on). > >>>>> > I assume that it is needless to say that this is a > >>>> non-issue when > >>>>> the IOMMU feature is disabled. > >>> [...] > >>> > >>> So there is a bug in the BIOS, and you have a workaround for it. > >>> I don't see a bug in Debian. > >>> > >>> Ben. > >> I don't understand your statement. IOMMU is a feature that allows > >> for passthrough of I/O devices to virtual machines. I need this > >> feature on my computer but Debian doesn't work with that feature. > > Like many new hardware features, IOMMUs must be correctly described > > by the BIOS before an operating system can use them. > > > >> If this was due to a bug in the BIOS why the does it not crash > >> Citrix Xenserver 5.6, Windows 7 x64 or even FreeDOS/MS-DOS? > > > > Because they don't try to use the IOMMU. > > > > Ben. > > > > Ok, I have failed to activate the IOMMU feature in the XenServer (by > adding iommu=1 after xen.gz in the /boot/extlinux.conf and running > extlinux /boot). [...]
I'm not sure what you mean by that. If you *do* use that option, does XenServer boot and are you able to use PCI pass-through? Ben. -- Ben Hutchings Once a job is fouled up, anything done to improve it makes it worse.
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