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Date: Fri, 09 Jul 2010 12:44:04 +0200
From: Wolfgang Grandegger <wg@domain.hid>
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Subject: Re: [Xenomai-help] IXXAT SJA_MOD register refuses to set up dual
 channel cards
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To: Peter Soetens <peter@domain.hid>
Cc: xenomai-help <xenomai@xenomai.org>

Hi Peter,

On 07/09/2010 12:26 PM, Peter Soetens wrote:
> Hi,
> 
> (Xenomai 2.5.2&2.5.3)
> 
> I'm testing the rtcan ixxat driver for a dual channel card (PLX
> Technology, Inc. Device 2540)
> 
> It recognizes the first channel, but refuses to setup the second one
> because the SJA_MOD flag is 0x7f instead of 0x21
> The SJA_IR and SJA_SR flags read as are what the driver expects.

In the Socket-CAN "plx_pci" driver we mask the value with 0xa1:

  0x7f & 0xa1 = 0x21 ==> OK.

See
http://lxr.linux.no/#linux+v2.6.34.1/drivers/net/can/sja1000/plx_pci.c#L223

> Any suggestions on what it means and how to fix this ?

See above. A patch would be nice.

Wolfgang.