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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Rolf Evers-Fischer <embedded24@evers-fischer.de>
Cc: barebox@lists.infradead.org
Subject: Re: New driver crashes with "unable to handle paging request"
Date: Thu, 24 Apr 2014 08:58:48 +0200	[thread overview]
Message-ID: <20140424065848.GV5858@pengutronix.de> (raw)
In-Reply-To: <1566538733.276756.1398269380974.open-xchange@email.1und1.de>

Hi Rolf,

On Wed, Apr 23, 2014 at 06:09:40PM +0200, Rolf Evers-Fischer wrote:
> I'm just trying to port the USB driver "musb" (for the AM335x platform) from
> linux kernel to barebox.
> But whenever I want to read any address in the range 0x47401400-0x474017ff, the
> barebox crashes with "unable to handle paging request".
> I have already tried to invoke a "map_io_sections(0x0, 0x47400000, 0x2000)", but
> it didn't help.

barebox creates a flat 1:1 mapping when the MMU is enabled. You won't
need any calls to map_io_sections or some ioremap correspondent
function.

It may be that you have to enable some bus clocks in order to access the
musb.

To make sure you don't have MMU trouble could you post the output of
'mmuinfo 0x47400000'?

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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  reply	other threads:[~2014-04-24  6:59 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-23 16:09 Rolf Evers-Fischer
2014-04-24  6:58 ` Sascha Hauer [this message]
2014-04-24  8:52   ` Rolf Evers-Fischer
2014-04-30 14:08     ` Rolf Evers-Fischer
2014-05-01 22:50       ` Christoph Fritz
2014-05-05 12:13         ` Rolf Evers-Fischer
2014-05-12 12:57           ` Rolf Evers-Fischer
2014-05-13 11:03             ` Alexander Aring
2014-05-13 12:49               ` Christoph Fritz
2014-05-15 11:37                 ` Rolf Evers-Fischer

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