Question about DBCR0 initialization for 440

[John Linn]

> -----Original Message-----
> From: Josh Boyer [mailto:jwboyer at linux.vnet.ibm.com] 
> Sent: Friday, April 17, 2009 2:36 PM
> To: John Linn
> Cc: grant.likely at secretlab.ca; Benjamin Herrenschmidt; 
> linuxppc-dev at ozlabs.org; Hollis Blanchard; Tirumala Reddy Marri
> Subject: Re: Question about DBCR0 initialization for 440
> 
> On Fri, Apr 17, 2009 at 02:30:45PM -0600, John Linn wrote:
> >> > Might be worth checking if external debug is enabled, and 
> >> override it
> >> > only if it's not.
> >> 
> >> ppc440x5_um.pdf says that both can be enabled.
> >> 
> >
> >The code that I started the thread with, from the fsl file, 
> has conditional for the BDI around it.
> >
> >We think that we still need that conditional as the code is 
> not Oring in the enable such that it would
> >disable external debug mode for the BDI. But we need it this 
> way for our Xilinx pod.
> 
> EDM is a read-only bit according to the docs I have.  You 
> can't set it (or
> clear it) at all.  It's only set by external hardware.

That's strange, my 440x4_um.pdf does not say it's read-only unless it's
in some obscure place.

> 
> josh
> 
> 

This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately.