testing early microcode loading
Mark Johnston
markj at freebsd.org
Mon Sep 10 18:27:03 UTC 2018
Hi,
Support for boot-time loading of Intel microcode updates has landed in
the kernel in r337715, and in the sysutils/devcpu-data port as of 1.20.
I'd like to solicit some testing of the feature ahead of 12.0.
The port has been modified to install /boot/firmware/intel-ucode.bin.
This file contains a copy of every Intel microcode update supplied by
the port. Per the pkg-message, one can enable early loading of this
file by specifying:
cpu_microcode_load="YES"
cpu_microcode_name="/boot/firmware/intel-ucode.bin"
in loader.conf. The update will be applied upon a subsequent reboot.
Testing consists of enabling early loading and verifying that the CPUs
report an updated microcode version. If early loading fails, a message
is printed to the dmesg. If your system is capable of successful ACPI
suspend/resume, it is useful to also verify that the microcode remains
updated following a resume.
To fetch the current microcode version, use sysutils/x86info:
# kldload -n cpuctl && x86info -a | grep Micro
Microcode version: 0x0000000000000020
Compare with the version installed by the microcode_update rc script at
run-time:
# service microcode_update onestart
Updating CPU Microcode...
Done.
# kldload -n cpuctl && x86info -a | grep Micro
Microcode version: 0x0000000000000020
If your testing indicates that the boot-time loading method doesn't
work, please include the dmesg in your reply. Thanks in advance.
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