Bug 744659 - kernel hangs during boot if IOMMU enabled on Supermicro H8DG6-F
Summary: kernel hangs during boot if IOMMU enabled on Supermicro H8DG6-F
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel
Version: 5.7
Hardware: x86_64
OS: Linux
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Red Hat Kernel Manager
QA Contact: Red Hat Kernel QE team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-10-10 03:17 UTC by starlight
Modified: 2011-10-14 15:19 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-10-14 15:19:12 UTC
Target Upstream Version:

Attachments (Terms of Use)
successful EL5 boot 'dmesg' with IOMMU disabled (45.10 KB, text/plain)
2011-10-10 03:17 UTC, starlight 		no flags Details
successful EL6 boot with IOMMU *enabled* (66.53 KB, text/plain)
2011-10-10 03:18 UTC, starlight 		no flags Details
dmidecode (22.16 KB, text/plain)
2011-10-10 03:19 UTC, starlight 		no flags Details
lspci (4.00 KB, text/plain)
2011-10-10 03:20 UTC, starlight 		no flags Details
lspci -vvv (80.90 KB, text/plain)
2011-10-10 03:20 UTC, starlight 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

Description starlight 2011-10-10 03:17:51 UTC 
Created attachment 527130 [details]
successful EL5 boot 'dmesg' with IOMMU disabled

Description of problem:

If IOMMU is enabled in BIOS on Supermicro H8DG6-F
system hangs after the line

   ACPI: DMAR not present

is displayed.  Tried booting with 'intel_iommu=off'
but it did not help.  System works fine with
IOMMU disabled in BIOS and boots into
RHEL6 2.6.32-71.29.1.el6 no problem with IOMMU
enabled.  Also boots Windows 2008 R2 with IOMMU
enabled.

Version-Release number of selected component (if applicable):

kernel 2.6.18-274.3.1.el5

How reproducible:

Enable IOMMU in BIOS.

Boot system.
  
Actual results:

Hangs during boot at "ACPI: DMAR not present"

Expected results:

should boot ok

Additional info:

one Opteron 6174 CPU, 16GB DDR3 RAM
Comment 1 starlight 2011-10-10 03:18:47 UTC 
Created attachment 527131 [details]
successful EL6 boot with IOMMU *enabled*
Comment 2 starlight 2011-10-10 03:19:49 UTC 
Created attachment 527132 [details]
dmidecode
Comment 3 starlight 2011-10-10 03:20:09 UTC 
Created attachment 527133 [details]
lspci
Comment 4 starlight 2011-10-10 03:20:31 UTC 
Created attachment 527134 [details]
lspci -vvv
Comment 5 starlight 2011-10-11 06:17:46 UTC 
Never mind.

BIOS v2.0 fixes it.
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