Re: Updating CPU microcode possible?

[Nikos Chantziaras]

On 02/06/14 16:39, Andrey Borzenkov wrote:
> В Mon, 02 Jun 2014 13:39:42 +0300
> Nikos Chantziaras <address@hidden> пишет:
>
> > On 01/06/14 18:12, Andrey Borzenkov wrote:
> > > В Sat, 31 May 2014 12:18:06 +0300
> > > Nikos Chantziaras <address@hidden> пишет:
> > > [...]
> > > > I'm using Grub 2.02 beta 2 to boot three operating systems on my machine
> > > > (Gentoo, FreeBSD and Windows 8.1.) It would be nice if I could make Grub
> > > > do a microcode update before booting any of those operating systems.
> > > > Right now, I am only able to a microcode update in Linux, after the
> > > > kernel is booted.
> > >
> > > Someone will need to write grub code to do it.
> >
> > I found this:
> >
> >     http://biosbits.org
> >
> > This seems to be a fork of Grub. I suppose there's no plans to merge any
> > of this in Grub?
>
> You need to contact Intel and ask them to submit code upstream.
>
> Note that they support microcode loading on PC BIOS platform only and
> Linux can do it on both PC BIOS and UEFI. What is wrong with loading
> microcode after Linux is booted?

Linux isn't booted. Therefore, no microcode update. And you can't boot 
Linux anyway to do the update and then reboot to another OS; the 
microcode doesn't persist across reboots.