linux-kernel - Re: [PATCH V3 4/4] microcode/x86/amd: early microcode patch loading support for AMD

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Date:	Fri, 31 May 2013 21:32:00 +0200
From:	Andreas Herrmann <herrmann.der.user@...glemail.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Jacob Shin <jacob.shin@....com>, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Fenghua Yu <fenghua.yu@...el.com>,
	Borislav Petkov <bp@...en8.de>, Joe Perches <joe@...ches.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 4/4] microcode/x86/amd: early microcode patch loading
 support for AMD

On Fri, May 31, 2013 at 01:26:49AM -0300, Henrique de Moraes Holschuh wrote:
> On Thu, 30 May 2013, Jacob Shin wrote:
> >  mkdir initrd
> >  cd initrd
> > -mkdir kernel
> > -mkdir kernel/x86
> > -mkdir kernel/x86/microcode
> > -cp ../microcode.bin kernel/x86/microcode/GenuineIntel.bin
> > -find .|cpio -oc >../ucode.cpio
> > +mkdir -p kernel/x86/microcode
> > +cp ../microcode.bin kernel/x86/microcode/GenuineIntel.bin (or AuthenticAMD.bin)
> 
> Can I just 
> 'cat /lib/firmware/amd-ucode/*bin >kernel/x86/microcode/AuthenticAMD.bin' 
> to get a valid microcode container for all amd processors?
> 
> The answer for Intel is "yes".  I sure hope it is the same for AMD...

No, this doesn't work for AMD.

The container file includes a header section with information how to
map CPU F/M/S to microcode revisions provided with a container
file. Concatenating several container files will not create an
all-embracing header section.

More details were available on the amd64.org web pages.  But it seems
that the web site is not available anymore ...


Andreas
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