What's the preferred way to export board information to userspace ?

What's the preferred way to export board information to userspace ?

[Laurent Pinchart]

Hi everybody,

I need to export some read-only board-specific information (serial number,=
=20
boot mode jumper configuration, ...) to userspace applications.

Could anyone advice me on the preferred way to do that ? I can easily add a=
=20
quick&dirty sysfs/procfs based implementation, but I was wondering if there=
=20
was some kind of clean and generic way.

Best regards,

=2D-=20
Laurent Pinchart
CSE Semaphore Belgium

Chauss=E9e de Bruxelles, 732A
B-1410 Waterloo
Belgium

T +32 (2) 387 42 59
=46 +32 (2) 387 42 75

What's the preferred way to export board information to userspace ?

[Laurent Pinchart]

Hi everybody,

it seems linuxppc-embedded is going away. I should have posted this here in=
=20
the first place, so sorry for the cross-post.

I need to export some read-only board-specific information (serial number,=
=20
boot mode jumper configuration, ...) that are collected from various locati=
ons=20
(CPLD, flash, U-Boot, ...) to userspace applications.

Could anyone advice me on the preferred way to do that ? I can easily add a=
=20
quick&dirty sysfs/procfs based implementation, but I was wondering if there=
=20
was some kind of clean and generic way.

Best regards,

=2D-=20
Laurent Pinchart
CSE Semaphore Belgium

Chauss=E9e de Bruxelles, 732A
B-1410 Waterloo
Belgium

T +32 (2) 387 42 59
=46 +32 (2) 387 42 75

Re: What's the preferred way to export board information to userspace ?

[Benjamin Herrenschmidt]

On Tue, 2007-10-02 at 10:10 +0200, Laurent Pinchart wrote:
> Hi everybody,
> 
> it seems linuxppc-embedded is going away. I should have posted this here in 
> the first place, so sorry for the cross-post.
> 
> I need to export some read-only board-specific information (serial number, 
> boot mode jumper configuration, ...) that are collected from various locations 
> (CPLD, flash, U-Boot, ...) to userspace applications.
> 
> Could anyone advice me on the preferred way to do that ? I can easily add a 
> quick&dirty sysfs/procfs based implementation, but I was wondering if there 
> was some kind of clean and generic way.

Userspace can read /proc/device-tree no ? :-)

Appart from that, it's common to stick that sort of thing
in /proc/cpuinfo... /sys/firmware may be an option if you have shitloads
of stuff ..

Ben.

Re: What's the preferred way to export board information to userspace ?

[Laurent Pinchart]

Hi Ben,

On Tuesday 02 October 2007 10:39, Benjamin Herrenschmidt wrote:
> On Tue, 2007-10-02 at 10:10 +0200, Laurent Pinchart wrote:
> > Hi everybody,
> >
> > it seems linuxppc-embedded is going away. I should have posted this here
> > in the first place, so sorry for the cross-post.
> >
> > I need to export some read-only board-specific information (serial
> > number, boot mode jumper configuration, ...) that are collected from
> > various locations (CPLD, flash, U-Boot, ...) to userspace applications.
> >
> > Could anyone advice me on the preferred way to do that ? I can easily a=
dd
> > a quick&dirty sysfs/procfs based implementation, but I was wondering if
> > there was some kind of clean and generic way.
>
> Userspace can read /proc/device-tree no ? :-)

Except I'm still using ARCH=3Dppc. I know I shouldn't :-) The MPC8272 isn't=
 well=20
supported in ARCH=3Dpowerpc. Scott Wood submitted some patches I need befor=
e=20
switching.

> Appart from that, it's common to stick that sort of thing
> in /proc/cpuinfo... /sys/firmware may be an option if you have shitloads
> of stuff ..

It's not really CPU information, but I guess I can stick that in there.

Best regards,

=2D-=20
Laurent Pinchart
CSE Semaphore Belgium

Chauss=C3=A9e de Bruxelles, 732A
B-1410 Waterloo
Belgium

T +32 (2) 387 42 59
=46 +32 (2) 387 42 75