Unknown bios error code =004b

unknown bios error code =004b

BIOS updates (AGESA) yields "Error: internal error: Unknown PCI A VGA Passthrough relies on a number of technologies that are not. 004B. Unknown BIOS error. Error code = 14B (this is really LANGUAGE_MODULE_ERR). 004C. Keyboard/Interface Error. 004D. Primary Master Hard Disk Error. If you encounter any of the BIOS Power-On Self-Test (POST) error codes, then this post is intended to help Error code = 004A; 004B – Unknown BIOS error.

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1 16 Bit FIFO read of above data
QAR and read it back
grep -i -e DMAR -e IOMMU[ 0.000000] ACPI: DMAR 0x00000000BDCB1CB0 0000B8 (v01 INTEL BDW 00000001 INTL 00000001) [ 0.000000] Intel-IOMMU: enabled [ 0.028879] dmar: IOMMU 0: reg_base_addr fed90000 ver 1:0 cap c0000020660462 ecap f0101a [ 0.028883] dmar: IOMMU 1: reg_base_addr fed91000 ver 1:0 cap d2008c20660462 ecap f010da [ 0.028950] IOAPIC id 8 under DRHD base 0xfed91000 IOMMU 1 [ 0.536212] DMAR: No ATSR found [ 0.536229] IOMMU 0 0xfed90000: using Queued invalidation [ 0.536230] IOMMU 1 0xfed91000: using Queued invalidation [ 0.536231] IOMMU: Setting RMRR: [ 0.536241] IOMMU: Setting identity map for device 0000:00:02.0 [0xbf000000 - 0xcf1fffff] [ 0.537490] IOMMU: Setting identity map for device 0000:00:14.0 [0xbdea8000 - 0xbdeb6fff] [ 0.537512] IOMMU: Setting identity map for device 0000:00:1a.0 [0xbdea8000 - 0xbdeb6fff] [ 0.537530] IOMMU: Setting identity map for device 0000:00:1d.0 [0xbdea8000 - 0xbdeb6fff] [ 0.537543] IOMMU: Prepare 0-16MiB unity mapping for LPC [ unknown bios error code =004b IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 - 0xffffff] [ 2.182790] [drm] DMAR active, unknown bios error code =004b, unknown bios error code =004b use of stolen memory

Ensuring that the groups are valid

The following script should allow you to see how your various PCI devices are mapped to IOMMU groups. If it does not return anything, you either have not enabled IOMMU support properly or your hardware does not support it.

#!/bin/bash shopt -s nullglob for g in $(find /sys/kernel/iommu_groups/* -maxdepth 0 -type d unknown bios error code =004b

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