From: Sascha Hauer <s.hauer@pengutronix.de>
To: Jerry Kirk <jkirk865@gmail.com>
Cc: barebox@lists.infradead.org
Subject: Re: USB On PCM043?
Date: Fri, 20 Jul 2012 10:04:35 +0200 [thread overview]
Message-ID: <20120720080435.GP30009@pengutronix.de> (raw)
In-Reply-To: <loom.20120719T224910-551@post.gmane.org>
On Thu, Jul 19, 2012 at 08:56:35PM +0000, Jerry Kirk wrote:
> > > We have been attempting to get USB Host mode working under Barebox(2012-07-0)
> > > a PCM043 platform (i.mx35), but we are having a bit of trouble.
> >
> > Could it be that the USB clock operates at the wrong rate? I think it
> > should be 60MHz.
>
> We're not certain how to verify the clock setting for USB in Barebox.
> We have used "dump_clocks" but are not certain which of these clocks
> the USB clock is derived from. We think we have it set to the same
> settings as the Eukrea board.
The i.MX SoCs have a clko pin which can be muxed to different clocks. I
don't know if this is accessible on the pcm043, but if yes, you could
switch it to the USB clock and measure the clock.
Otherwise it might be good to run a current -rc kernel, you can then
see the complete clock tree in debugfs
Sascha
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next prev parent reply other threads:[~2012-07-20 8:04 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-19 15:37 Jerry Kirk
2012-07-19 16:11 ` Sascha Hauer
2012-07-19 20:56 ` Jerry Kirk
2012-07-20 8:04 ` Sascha Hauer [this message]
2012-08-01 13:33 ` [RFC][PATCH] pcm043: usb support --not working-- Christoph Fritz
2012-08-01 16:56 ` Eric Bénard
2012-08-01 21:04 ` Christoph Fritz
2012-08-02 7:08 ` Eric Bénard
2012-08-02 8:15 ` Sascha Hauer
2012-08-02 13:59 ` Jerry Kirk
2012-11-06 19:48 ` Michael Burkey
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