Re: [gentoo-user] microcode applied?

[Peter Humphrey]

On Tuesday, 9 January 2018 07:31:35 GMT Mick wrote:
> On Tuesday, 9 January 2018 00:15:03 GMT Peter Humphrey wrote:
> > On Monday, 8 January 2018 10:29:41 GMT Max Zettlmeißl wrote:
> > > > How do you build the microcode into the kernel? The only
> > > > place I can see to do that in menuconfig is under Device Drivers;
> > > > there's no such field under Firmware.
> > >
> > > The Device Drivers section is exactly where the microcode is included.
> > > CONFIG_EXTRA_FIRMWARE is the relevant symbol.
> >
> > Right. So which of the 95 files under /lib/firmware/intel-ucode do I
> > specify? That's in addition to the 14 files I have for my amdgpu.
>
> There may be a cleverer way, but this is how I have been doing it.
>
> Install sys-apps/iucode_tool.  Run:
>
> # iucode_tool -S
>
> It will report the microcode signature for your CPU.  For example, one of
> mine:
>
> iucode_tool: system has processor(s) with signature 0x000106e5
>
>
> (Re)emerge sys-firmware/intel-microcode and capture all its output.  Then
> search for the above signature, again from the same CPU, as an example,
> this matches:
>
> intel-ucode/06-1e-05
> signature: 0x106e5    <==
> flags:     0x13
> revision:  0x07
> date:      2013-08-20
> size:      7168
>
>
> Add the first line above in your CONFIG_EXTRA_FIRMWARE and rebuild your
> kernel.

Thanks Mick. After asking that, I discovered this web page, which confirms 
your method: https://wiki.gentoo.org/wiki/Intel_microcode . Then I found 
that I was already loading the right microcode, though I really have no idea 
where I'd got the information from.

Thanks to the others who answered as well.

-- 
Regards,
Peter.