Device Tree "Status" Property Question

Device Tree "Status" Property Question

[John Schmoller]

Hello all,

I'm currently working with U-Boot to pass POST results to Linux in an
FDT.  To do this, I'm intending to use the "status" property, as
documented in ePAPR 1.0 (I'm using PowerPC).  My question involves the
"fail-sss" property value.  What is the intention of "sss"?  Is it meant
to be 3 digit error code, or a string, or what?  I'd like to append a
failure message to the value if that's appropriate.  Something like
"fail-Widgit X did not respond" or some such thing.  Please let me know
if that's not the intended use of the "fail-sss" value.

Thanks for your time,
John

RE: Device Tree "Status" Property Question

[Yoder Stuart-B08248]

 

> -----Original Message-----
> From: 
> devicetree-discuss-bounces+stuart.yoder=freescale.com-uLR06cmDAlY@public.gmane.org
labs.org [mailto:devicetree-discuss->
bounces+stuart.yoder=freescale.com-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org] On 
> Behalf Of John Schmoller
> Sent: Wednesday, December 30, 2009 10:58 AM
> To: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
> Subject: Device Tree "Status" Property Question
> 
> Hello all,
> 
> I'm currently working with U-Boot to pass POST results to Linux in an
> FDT.  To do this, I'm intending to use the "status" property, as
> documented in ePAPR 1.0 (I'm using PowerPC).  My question involves the
> "fail-sss" property value.  What is the intention of "sss"?  
> Is it meant
> to be 3 digit error code, or a string, or what?  I'd like to append a
> failure message to the value if that's appropriate.  Something like
> "fail-Widgit X did not respond" or some such thing.  Please 
> let me know
> if that's not the intended use of the "fail-sss" value.

This property comes from IEEE-1275 and it's described use in that
spec is that the "sss" is human readable information.   So a message
as you described seems perfectly fine.  I've seen nothing that would
indicate a 3 digit error code is intended.

We plan to do a minor rev to the ePAPR in the near future and will 
clarify that when we do it.

Stuart

Re: Device Tree "Status" Property Question

[Scott Wood]

John Schmoller wrote:
> Hello all,
> 
> I'm currently working with U-Boot to pass POST results to Linux in an
> FDT.  To do this, I'm intending to use the "status" property, as
> documented in ePAPR 1.0 (I'm using PowerPC).  My question involves the
> "fail-sss" property value.  What is the intention of "sss"?  Is it meant
> to be 3 digit error code, or a string, or what?  I'd like to append a
> failure message to the value if that's appropriate.  Something like
> "fail-Widgit X did not respond" or some such thing.  Please let me know
> if that's not the intended use of the "fail-sss" value.

I believe it's supposed to be an arbitrary string, the meaning of which 
is device-specific.

-Scott