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[Libreboot] immo=soft?


From: Marcus Moeller
Subject: [Libreboot] immo=soft?
Date: Thu, 29 Jan 2015 22:07:10 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.4.0

Hi all,

on x200 I see the following error in kernel log:

[    0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: CPU: 0 PID: 0 at drivers/iommu/dmar.c:778 warn_invalid_dmar+0x6e/0x86() [ 0.000000] Your BIOS is broken; DMAR reported at address fed92000 returns all ones!
BIOS vendor: coreboot; Ver: CBET4000 4.0; Product Version: ThinkPad X200
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.18.4-gnu-1 #1
[ 0.000000] Hardware name: LENOVO T4537Z1/T4537Z1, BIOS CBET4000 4.0 01/26/2015 [ 0.000000] 0000000000000000 47e0174558e765c2 ffffffff81803db8 ffffffff8154c2e4 [ 0.000000] 0000000000000000 ffffffff81803e10 ffffffff81803df8 ffffffff8106fc11 [ 0.000000] ffffffff81803dd8 00000000fed92000 ffffffff81741350 ffffffff81b3100c
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff8154c2e4>] dump_stack+0x4e/0x71
[    0.000000]  [<ffffffff8106fc11>] warn_slowpath_common+0x81/0xa0
[    0.000000]  [<ffffffff8106fcee>] warn_slowpath_fmt_taint+0x4e/0x70
[ 0.000000] [<ffffffff81929e8b>] ? __early_ioremap.constprop.0+0x14b/0x1d3
[    0.000000]  [<ffffffff8154d02a>] warn_invalid_dmar+0x6e/0x86
[    0.000000]  [<ffffffff81942f73>] detect_intel_iommu+0xef/0x17a
[    0.000000]  [<ffffffff81904f20>] pci_iommu_alloc+0x4b/0x6e
[    0.000000]  [<ffffffff81915298>] mem_init+0x17/0x9d
[    0.000000]  [<ffffffff818f9de4>] start_kernel+0x257/0x4ad
[    0.000000]  [<ffffffff818f9120>] ? early_idt_handlers+0x120/0x120
[    0.000000]  [<ffffffff818f94d7>] x86_64_start_reservations+0x2a/0x2c
[    0.000000]  [<ffffffff818f9626>] x86_64_start_kernel+0x14d/0x170
[    0.000000] ---[ end trace 97227be102df4dc3 ]---
[ 0.000000] Memory: 4006488K/4155692K available (5466K kernel code, 907K rwdata, 1716K rodata, 1156K init, 1176K bss, 149204K reserved)

Have you experienced the same and tried to get around it (by e.g. setting immo=soft)?

Greets
Marcus

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