Bug 697231 - WARNING: at drivers/pci/dmar.c:633 warn_invalid_dmar+0x65/0x77()
Summary: WARNING: at drivers/pci/dmar.c:633 warn_invalid_dmar+0x65/0x77()
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 14
Hardware: i686
OS: Linux
unspecified
medium
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-04-17 02:51 UTC by youry
Modified: 2011-04-21 05:34 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-04-21 03:46:17 UTC
Type: ---

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Description youry 2011-04-17 02:51:27 UTC 
Description of problem:
Every boot I have a such report:

WARNING: at drivers/pci/dmar.c:633 warn_invalid_dmar+0x65/0x77()
Hardware name: System Product Name
Your BIOS is broken; DMAR reported at address fed90000 returns all ones!
BIOS vendor: American Megatrends Inc.; Ver: 0903   ; Product Version: System Version
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.35.12-88.fc14.i686.PAE #1
Call Trace:
 [<c0440161>] warn_slowpath_common+0x6a/0x7f
 [<c05ddb9c>] ? warn_invalid_dmar+0x65/0x77
 [<c04401ba>] warn_slowpath_fmt_taint+0x2c/0x30
 [<c05ddb9c>] warn_invalid_dmar+0x65/0x77
 [<c0a64cc8>] check_zero_address+0xbe/0xf4
 [<c0a64d0f>] detect_intel_iommu+0x11/0x69
 [<c0a441a5>] pci_iommu_alloc+0x8/0xa
 [<c0a516de>] mem_init+0xe/0x243
 [<c0a3d656>] start_kernel+0x1b8/0x34f
 [<c0a3d208>] ? unknown_bootoption+0x0/0x18d
 [<c0a3d0da>] i386_start_kernel+0xc9/0xd0


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

2.6.35.12-88.fc14.i686.PAE

How reproducible:
Every boot if you have VTD on in BIOS

I use the following MDASUS P7P55-M and CPU: i5CPU750 with 4GB RAM 

Steps to Reproduce:
1. Intel VTD on
2.
3.
  
Actual results:


Expected results:


Additional info:
Comment 1 Chuck Ebbert 2011-04-21 03:46:17 UTC 
Your BIOS is broken. This is not a kernel bug, it's just reporting what it found.
Comment 2 greenleaf 2011-04-21 04:56:14 UTC 
thanks Chuch Ebbert.
Comment 3 youry 2011-04-21 05:34:01 UTC 
I updated BIOS for several times and have again the same problem. If you want I can update BIOS again and submit report. 
When I switch off the Intel VDT in BIOS - all problems are gone. 

Thanks,

Youry
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