netdev - Re: [PATCH 3/3] can: at91_can: make can

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Message-ID: <4D2C4758.3030600@pengutronix.de>
Date:	Tue, 11 Jan 2011 13:04:40 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Wolfram Sang <w.sang@...gutronix.de>
CC:	Socketcan-core@...ts.berlios.de, netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] can: at91_can: make can_id of mailbox 0 configurable

On 01/11/2011 12:57 PM, Wolfram Sang wrote:
> On Tue, Jan 11, 2011 at 11:28:08AM +0100, 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:
>> echo 0x9fffffff > /sys/class/net/can0/mb0_id
> 
> Maybe put something like this also in Documentation/ABI/testing? Perhaps

Good point.

> a bit more explicit: Can this interface be used? Should it be used? Must
> it be used?

It can be used if your aren't satisfied with with default id of 0x7ff.

regards, Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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