linux-kernel - RE: [PATCH v2 01/10] Documentation/x86: Early load microcode

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Date:	Fri, 30 Nov 2012 20:40:24 +0000
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Borislav Petkov <borislav.petkov@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: RE: [PATCH v2 01/10] Documentation/x86: Early load microcode

> -----Original Message-----
> From: H. Peter Anvin [mailto:hpa@...or.com]
> Sent: Friday, November 30, 2012 11:46 AM
> To: Yu, Fenghua
> Cc: Ingo Molnar; Thomas Gleixner; Mallick, Asit K; Tigran Aivazian;
> Andreas Herrmann; Borislav Petkov; linux-kernel; x86
> Subject: Re: [PATCH v2 01/10] Documentation/x86: Early load microcode
> 
> On 11/29/2012 05:47 PM, Fenghua Yu wrote:
> > +
> > +mkdir initrd
> > +cd initrd
> > +cp ../microcode.hex kernel/x86/microcode/GenuineIntel/microcode.hex
> > +find .|cpio -oc >../ucode.cpio
> > +cd ..
> > +cat ucode.cpio /boot/initrd-3.5.0.img >/boot/initrd-3.5.0.ucode.img
> > +
> > +The generated /boot/initrd-3.5.0.ucode.img can be used as initrd
> file to load
> > +microcode during early boot time.
> >
> 
> This is wrong; first of all, this refers to microcode.hex whereas the
> patch refers to microcode.bin, and 

Will fix this sentence. 

> it misses the mandatory -H newc
> option to cpio.

I think there is no problem here. "-c" is "-H newc".

Quote from man cpio:
'-c' Identical to -H newc, use the new (SVR4) portable format.  If you wish the old
       portable (ASCII) archive format, use -H odc instead.

> 
> Could you update this bit, please?
> 
> 	-hpa

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