Question about DBCR0 initialization for 440

[Grant Likely]

On Fri, Apr 17, 2009 at 1:04 PM, Benjamin Herrenschmidt
<benh at kernel.crashing.org> wrote:
> On Fri, 2009-04-17 at 13:07 -0500, Hollis Blanchard wrote:
>> On Friday 17 April 2009 12:22:37 Josh Boyer wrote:
>> > On Fri, Apr 17, 2009 at 11:46 AM, John Linn <John.Linn at xilinx.com> wrote:
>> > > Josh, any thoughts on putting this into head_44x.S?
>> >
>> > The code in the fsl file looks like the right solution.  I do have an
>> > odd question though, in that it's hard for the
>> > kernel to really know if something like a BDI is running.  Namely,
>> > that config option doesn't cover RiscWatch in an obvious manner.
>>
>> Yeah, setting DBCR0 would interfere with all JTAG probes. The ifdef meands you
>> can't support both a JTAG debugger and hardware breakpoints in the same
>> binary? Now that's an annoying restriction.
>
> 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.

g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.