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Hi Surbata,
I'm trying to enable i7-6500 custom hardware and facing exception when
boot flow hit enable_pm_timer_emulation which you submitted in Feb
2017. Stack look like that:

Enable ACPI Timer Emulation via MSR 0x121
CPU Index 0 - APIC 0 Unexpected Exception:13 @ 10:7ab15acf - Halting
Code: 0 eflags: 00010002 cr2: 00000000
eax: 01311808 ebx: 00000000 ecx: 00000121 edx: 262e8b51
edi: 00000003 esi: 00850089 ebp: 7ab3c4a0 esp: 7ab44e50

7ab15a88:       00 83 c4 10 b9 aa 01 00
7ab15a90:       00 8b 80 94 00 00 00 80
7ab15a98:       b8 ca 04 00 00 00 74 09
7ab15aa0:       0f 32 0d c0 10 00 00 eb
7ab15aa8:       07 0f 32 25 3f ef ff ff
7ab15ab0:       0f 30 57 57 68 57 0d b3
7ab15ab8:       7a 6a 03 e8 4e 37 01 00
7ab15ac0:       ba 51 8b 2e 26 b8 08 18
7ab15ac8:       31 01 b9 21 01 00 00 0f
7ab15ad0:       30 58 5a 68 82 0d b3 7a
7ab15ad8:       6a 03 e8 2f 37 01 00 b8
7ab15ae0:       01 00 00 00 89 df 0f a2
7ab15ae8:       89 de 89 fb 83 c4 10 0f
7ab15af0:       ba e1 12 73 0c b9 f8 01
7ab15af8:       00 00 0f 32 83 c8 01 0f
7ab15b00:       30 56 56 68 9e 0d b3 7a %

I can't find document that describe this MSR, but it seems that
something is wrong.

Any ideas for further debugging are welcome.

P.S. According to commit message:
https://github.com/coreboot/coreboot/commit/f004f66ca7b0c428c04d60257383
19187cf911fe

It should be tied to review:
https://review.coreboot.org/#/c/18288/

but that link give me error. Gerrit broken or review "disappeared"?

Best Regards,
- -- 
Piotr Król
Embedded Systems Consultant
https://3mdeb.com | @3mdeb_com
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