On Thu, Sep 20, 2012 at 06:35:56PM +0100, Will Deacon wrote:
> On Thu, Sep 20, 2012 at 05:57:40PM +0100, Stephen Boyd wrote:
> > +/* Determine if halting mode is enabled */
> > +static int halting_mode_enabled(void)
> > +{
> > + u32 dscr;
> > +
> > + ARM_DBG_READ(c1, 0, dscr);
> > +
> > + if (WARN_ONCE(dscr & ARM_DSCR_HDBGEN,
> > + "halting debug mode enabled. Unable to access hardware
> > resources.\n")) {
> > + return -EPERM;
> > + }
> > + return 0;
> > +}
>
> ...it looks like debug arch 7.1 defines this bit as UNKNOWN when the OS lock
> is clear, so we probably shouldn't be reading it at all. I'll pour myself a
> stiff drink and start reading the debug arch docs to work out what on Earth
> we should do.
>
> Stay tuned.
Ok, I've pushed a bunch of patches to my hw-breakpoint branch (head commit
55cb726797c7). I'll post them to the list after the merge window, but please
do take them for a spin if you get a chance.
Will
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