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From: Christoph Fritz <chf.fritz@googlemail.com>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: Re[3]: Omap4 DSS clocks
Date: Thu, 14 Mar 2013 14:46:01 +0100	[thread overview]
Message-ID: <1363268762.5588.1.camel@lovely> (raw)
In-Reply-To: <20130314133341.GK1906@pengutronix.de>

On Thu, 2013-03-14 at 14:33 +0100, Sascha Hauer wrote:
> On Thu, Mar 14, 2013 at 02:23:56PM +0100, Christoph Fritz wrote:
> > On Thu, 2013-03-14 at 17:11 +0400, Alexander Shiyan wrote:
> > > > > On Thu, 2013-03-14 at 16:48 +0400, Alexander Shiyan wrote:
> > > > > > >  Barebox crashes while reading a DSS register:
> > > > > > > 
> > > > > > >   $ md 0x48040000
> > > > > > >   unable to handle paging request at address 0x48040000
> > > > > > > 
> > > > > > > I suppose this is due to a turned off clock.
> > > > > > > 
> > > > > > > Any hints?
> > > > > > 
> > > > > > Probably this is a bug. I reproduced it.
> > > > > > 
> > > > > > Try to specify start & end address, like:
> > > > > > md -l 0x48040000-0x48040010
> > > > > 
> > > > > I get the same effect: it crashes.
> > > > 
> > > > OK. It seems rw_buf not initialized.
> > > > 
> > > > So change line:
> > > > static char *rw_buf; 
> > > > to
> > > > static char *rw_buf[RW_BUF_SIZE]; 
> > > Without asterisk, like:
> > >  static char rw_buf[RW_BUF_SIZE]; 
> > 
> > malloc expects a pointer:
> > commands/mem.c:634: error: incompatible types when assigning to type
> > ‘char[4096]’ from type ‘void *’
> > 
> > As you can see below, for a quick test I commented the lines, but
> > barebox still crashes.
> > 
> > Why don't you suppose that this is due to the non functional DSS?
> 
> I wouldn't expect a bug in the code. This would have been discovered
> already.

Register CM_DSS_DSS_CLKCTRL (0x4a009120) reads 0x00070F02 and so the
field [17:16] IDLEST reads 0x3 which means "Module is disabled and
cannot be accessed". On linux, its 0x2 which means "functional".

Any hints?

Thanks
 -- Christoph



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  reply	other threads:[~2013-03-14 13:46 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-14 12:19 Christoph Fritz
2013-03-14 12:48 ` Alexander Shiyan
2013-03-14 12:51   ` Christoph Fritz
2013-03-14 13:02     ` Re[2]: " Alexander Shiyan
2013-03-14 13:11       ` Re[3]: " Alexander Shiyan
2013-03-14 13:23         ` Christoph Fritz
2013-03-14 13:33           ` Sascha Hauer
2013-03-14 13:46             ` Christoph Fritz [this message]
2013-03-14 15:06               ` Christoph Fritz
2013-03-14 16:29                 ` Re[5]: " Alexander Shiyan
2013-03-15  8:20                   ` Christoph Fritz
2013-03-15  8:40                     ` Re[7]: " Alexander Shiyan
2013-03-15 13:39                       ` [PATCH] [RFC] ARM OMAP4: enable DSS by default Christoph Fritz
2013-04-04  6:42                         ` Christoph Fritz
2013-04-05  6:39                           ` Re[2]: " Alexander Shiyan

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