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| author | Tristan Corrick <tristan@corrick.kiwi> | 2018-10-31 02:26:41 +1300 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2018-11-01 22:22:57 +0000 |
| commit | ba8ead817dad9be5e3afa0a702d888d4a48a640d (patch) | |
| tree | 660ad9d9da8c76463b35001e1241bef836ee8bbf /Documentation/endverbatim.tex | |
| parent | 655ef61937ccd65c19e8ddeb3da1dd40c8238cf7 (diff) | |
cpu/intel/haswell: Allow use of TSC for the monotonic timer
When the Haswell-specific monotonic timer is used on an ASRock H81M-HDS
with a Pentium G3258, the following exception is generated, causing the
system to hang.
CPU Index 0 - APIC 0 Unexpected Exception:13 @ 10:7f7a3736 - Halting
Code: 0 eflags: 00010006 cr2: 00000000
eax: 00262626 ebx: 00140000 ecx: 00000603 edx: 00360000
edi: 00000007 esi: 00262626 ebp: 7f7c0fd8 esp: 7f7c0e90
The exception occurs when trying to read `MSR_COUNTER_24_MHz`, located
at 0x637. This MSR only exists on Haswell-ULT CPUs.
So, allow boards to use the TSC monotonic timer instead. They can do
this by placing `select TSC_MONOTONIC_TIMER` in the mainboard Kconfig.
Change-Id: I31d0e801b8cc85330dcb70c3fc03670f2e677e8f
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-on: https://review.coreboot.org/29383
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'Documentation/endverbatim.tex')
0 files changed, 0 insertions, 0 deletions