tree 76da8301ef861c1827d5280a67e75160019dda0f
parent ba8ead817dad9be5e3afa0a702d888d4a48a640d
author Tristan Corrick <tristan@corrick.kiwi> 1540906032 +1300
committer Nico Huber <nico.h@gmx.de> 1541111001 +0000

cpu/intel/haswell: Only change the slow ramp rate for ULT CPUs

On my system (Pentium G3258, ASRock H81M-HDS), changing the the slow
ramp rate during `initialize_vr_config()` results in the following
exception, 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

So, only change this setting for Haswell ULT CPUs, as suggested by the
BIOS Writer's guide.

Change-Id: I79b10139295741d298ac6c77c4f7272ac151ad90
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-on: https://review.coreboot.org/29384
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>