On 01/11/2011 12:45 PM, Wolfgang Grandegger wrote:
> On 01/11/2011 11:28 AM, Marc Kleine-Budde wrote:
>> Due to a chip bug (errata 50.2.6.3 & 50.3.5.3 in
>> "AT91SAM9263 Preliminary 6249H-ATARM-27-Jul-09") the contents of mailbox
>> 0 may be send under certain conditions (even if disabled or in rx mode).
>>
>> The workaround in the errata suggests not to use the mailbox and load it
>> with a unused identifier.
>>
>> This patch implements the second part of the workaround. A sysfs entry
>> "mb0_id" is introduced. While the interface is down it can be used to
>> configure the can_id of mailbox 0. The default value id 0x7ff.
>>
>> In order to use an extended can_id add the CAN_EFF_FLAG (0x80000000U)
>> to the can_id. Example:
>>
>> - standard id 0x7ff:
>> echo 0x7ff > /sys/class/net/can0/mb0_id
>>
>> - extended if 0x1fffffff:
^^
I've fixed the typo on my git repo. I'll send an updated series later.>> echo 0x9fffffff > /sys/class/net/can0/mb0_id > > As this is a device specific property, I think it should go into > /sys/class/net/can0/device/. The attribute goes autoamtically to /sys/class/net/can0 if you add it to the driver via: + dev->sysfs_groups[0] = &at91_sysfs_attr_group; I've copied this from the janz-ican3 driver[1]. regards, Marc [1] http://lxr.linux.no/linux+v2.6.37/drivers/net/can/janz-ican3.c#L1682 -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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