Re: [PATCH 3/3] can: at91_can: make can_id of mailbox 0 configurable

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

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