[CentOS] Warning: Your BIOS is broken

[John R Pierce]

On 2/21/2013 12:43 PM, Robert Moskowitz wrote:
> :[Firmware Warn]: Your BIOS is broken; DMAR reported at address fed90000
> returns all ones!

I googled "Your BIOS is broken; DMAR reported at address fed90000 
returns all ones!" and got some related results.

this bug report (on FC12) says...  "yes, your bios is broken, but its 
not a bug, we worked around it"
https://bugzilla.redhat.com/show_bug.cgi?id=896652

on a similar/identical bug with Fedora FC17, someone suggested booting 
with iommu=off to work around this.

on a similar debian bug report, it was stated that this error only 
happened when the BIOS setting for "VT-d" was enabled.    VT-d is only 
used to virtualized complete IO cards (like, dedicating a specified 
PCI-Express device to a given VM rather than handling it in the host and 
virtualizing the logical device).    If your BIOS has an option to turn 
VT-d off, you might try that.




-- 
john r pierce                                      37N 122W
somewhere on the middle of the left coast