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Re: port-i386/52266: Double fault early in boot with AMD Am5x86 CPU
The following reply was made to PR port-i386/52266; it has been noted by GNATS.
From: "John D. Baker" <jdbaker%mylinuxisp.com@localhost>
Subject: Re: port-i386/52266: Double fault early in boot with AMD Am5x86 CPU
Date: Tue, 11 Jul 2017 17:18:13 -0500 (CDT)
Looking at the reports so far and the meaning of each of the various
CPUID_* bits, it looks like:
AMD Am5x86 (Elan SC520): No MSR, No APIC
NS Geode: MSR, No APIC, rdmsr_safe() works
TM Crusoe: MSR, No APIC, rdmsr_safe() fails
Are there any CPUs which implement APIC w/o MSR? If not, then perhaps
the condition could be made:
if (!(ISSET(cpu_feature, APIC) &&
ISSET(cpu_feature, CPUID_MSR)) ||
rdmsr_safe(MSR_APICBASE, &msr) == EFAULT)
to satisfy the above cases?
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