On 01/22/2014 11:24 AM, Alexandre COFFIGNAL wrote:
> Hi all,
>
> I use two rtcan flexcan on imx28-evk board.
>
> If both rtcan devices receive a data at the same time, this cause a freeze.
> After investigation, i found that if I replace in flexcan_rx_interrupt
> these instructions :
> - *(__be32 *)(cf->data + 0) =
> - cpu_to_be32(flexcan_read(&mb->data[0]));
> - *(__be32 *)(cf->data + 4) =
> - cpu_to_be32(flexcan_read(&mb->data[1]));
>
> by these
>
> + data0 = flexcan_read(&mb->data[0]);
> + data1 = flexcan_read(&mb->data[1]);
> +
> + cf->data[3]=((data0 >> 0) & 0xFF) ;
> + cf->data[2]=((data0 >> 8) & 0xFF) ;
> + cf->data[1]=((data0 >> 16) & 0xFF) ;
> + cf->data[0]=((data0 >> 24) & 0xFF) ;
> + cf->data[7]=((data1 >> 0) & 0xFF) ;
> + cf->data[6]=((data1 >> 8) & 0xFF) ;
> + cf->data[5]=((data1 >> 16) & 0xFF) ;
> + cf->data[4]=((data1 >> 24) & 0xFF) ;
>
> rtcan flexcan works perfectly.
> is anyone know what is the problem with first instructions ?
Probably mb->data does not have the right alignment. Could you not
arrange to get it properly aligned? Failing that, you should use
put_unaligned instead of open coding it.
--
Gilles.
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