Hi Marc,
On Thu, 6 Jan 2022, Marc Kleine-Budde wrote:
Hello Angelo,
On 02.07.2021 11:48:41, Angelo Dureghello wrote:
Add flexcan support for NXP ColdFire mcf5441x family.
This flexcan module is quite similar to imx6 flexcan module, but
with some exceptions:
- 3 separate interrupt sources, MB, BOFF and ERR,
- implements 16 mb only,
- m68k architecture is not supporting devicetrees, so a
platform data check/case has been added,
- ColdFire is m68k, so big-endian cpu, with a little-endian flexcan
module.
we're currently discussing the option that the user of a flexcan can
switch between RX-FIFO and RX via mailboxes.
I noticed that the mcf5441x currently is configured for FIFO mode. Have
you tested the driver in mailbox mode?
The reason that some cores use the FIFO mode is, that they cannot
receive RTR CAN frames in mailbox mode. According to the IP core
overview table, the mcf5441x can receive RTR frames.
If the IP core supports reception of RTR frames, mailbox mode should be
used, as it makes use of more buffers (16-2) instead of 6 in FIFO mode.
Should we activate mailbox mode for the mcf5441x?
Ok, not sure why i selected FIFO mode initially, my application
actually is quite simple. Will try the switch to mailbox, sure,
looking into this.
regards,
Marc
Regards,
angelo
--
Pengutronix e.K. | Marc Kleine-Budde |
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