linux-kernel - Re: [PATCH] ARM: /proc/cpuinfo: Use DT machine name when possible

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Date:	Mon, 24 Nov 2014 23:16:12 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Fabio Estevam <festevam@...il.com>
Cc:	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Pavel Machek <pavel@....cz>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: /proc/cpuinfo: Use DT machine name when possible

On Wednesday 18 June 2014 23:53:00 Fabio Estevam wrote:
> On Wed, Jun 18, 2014 at 5:20 PM, Pali Rohár <pali.rohar@...il.com> wrote:
> > So how to read Revision and Serial number in DT based
> > kernel?
> 
> $ cat /sys/bus/soc/devices/soc0/soc_id
> i.MX6SX
> 
> $ cat /sys/bus/soc/devices/soc0/revision
> 1.0
> 
> $ cat /sys/bus/soc/devices/soc0/machine
> Freescale i.MX6 SoloX SDB Board

This does *not* working with DT based boot!

$ cat /sys/bus/soc/devices/soc0/soc_id
cat: can't open '/sys/bus/soc/devices/soc0/soc_id': No such file or directory
$ cat /sys/bus/soc/devices/soc0/revision 
ES3.1
$ cat /sys/bus/soc/devices/soc0/machine 
OMAP3430/3530


Here is output from *non* DT based boot:

# busybox cat /proc/cpuinfo 
processor       : 0
model name      : ARMv7 Processor rev 3 (v7l)
Features        : swp half thumb fastmult vfp edsp thumbee neon 
vfpv3 tls vfpd32 
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x2
CPU part        : 0xc08
CPU revision    : 3

Hardware        : Nokia RX-51 board
Revision        : 0012
Serial          : 0000000000000000


As you can see in those files are totally *different* values.

-- 
Pali Rohár
pali.rohar@...il.com

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