IOMMU issue

[Stephen Davies]

I have just used fedup to upgrade from FC17 to FC18.

When I reboot into fedup, the screen is unreadable in graphics mode so I 
changed the grub configuration to use console.

Now booting to fedup gives:

dmar:IOMMU: failed to map dmar0

and hangs/crashes/freezes.

If I reboot to FC17, the system is perfectly usable but dmesg tells me:


[    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-3.3.4-5.fc17.x86_64 
root=/dev/mapper/vg_mustang-lv_root ro rd.md=0 rd.dm=0 SYSFONT=True 
KEYTABLE=us rd.lvm.lv=vg_mustang/lv_swap rd.lvm.lv=vg_mustang/lv_root 
rd.luks=0 LANG=en_US.UTF-8 rhgb quiet
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] Checking aperture...
[    0.000000] No AGP bridge found
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: at drivers/iommu/dmar.c:492 
warn_invalid_dmar+0x92/0xa0()
[    0.000000] Hardware name: S3210SH
[    0.000000] Your BIOS is broken; DMAR reported at address feb00000 returns 
all ones!
[    0.000000] BIOS vendor: Intel Corporation; Ver: 
S3200X38.86B.00.00.0033.112120071101; Product Version: 
[    0.000000] Modules linked in:
[    0.000000] Pid: 0, comm: swapper Not tainted 3.3.4-5.fc17.x86_64 #1
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff810568af>] warn_slowpath_common+0x7f/0xc0
[    0.000000]  [<ffffffff8105694f>] warn_slowpath_fmt_taint+0x3f/0x50
[    0.000000]  [<ffffffff8103d0c9>] ? native_flush_tlb_single+0x9/0x10
[    0.000000]  [<ffffffff81b0164b>] ? __early_set_fixmap+0x99/0xa0
[    0.000000]  [<ffffffff814bcc42>] warn_invalid_dmar+0x92/0xa0
[    0.000000]  [<ffffffff81b29c0c>] check_zero_address+0xc8/0xf7
[    0.000000]  [<ffffffff815f795f>] ? bad_to_user+0x7f9/0x7f9
[    0.000000]  [<ffffffff81b29c52>] detect_intel_iommu+0x17/0xb9
[    0.000000]  [<ffffffff81af4e7e>] pci_iommu_alloc+0x4a/0x73
[    0.000000]  [<ffffffff81b0140a>] mem_init+0x19/0xed
[    0.000000]  [<ffffffff815e09bc>] ? set_nmi_gate+0x48/0x4a
[    0.000000]  [<ffffffff81aeda20>] start_kernel+0x1da/0x3c5
[    0.000000]  [<ffffffff81aed346>] x86_64_start_reservations+0x131/0x135
[    0.000000]  [<ffffffff81aed44a>] x86_64_start_kernel+0x100/0x10f
[    0.000000] ---[ end trace a7919e7f17c0a725 ]---

After a deal of Googling, I tried adding iommu=off to the grub configuration 
boot args.

With that in place, neither FC17 nor fedup will boot so I have taken it out 
again.

Any ideas as to what I can do to get fedup to boot?

Cheers and thanks,
Stephen Davies

-- 
=============================================================================
Stephen Davies Consulting P/L                           Phone: 08-8177 1595
Adelaide, South Australia.                                Mobile:040 304 0583
Records & Collections Management.
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