Hi Mark, On 04/26/2016 11:24 AM, Mark Hounschell wrote: > I am having some difficulties with a synklink_gt4 card and/or its > driver. I am trying to read/write 16384 byte frames. I seem to be > able to write them but can only read 4096 bytes of data per read. The > documentation I have for this card says I can have a MAX frame size > of between 4096 and 65535. And I see code in the driver that agrees > with that doc. I understand how to set the maxframe size for each > port properly but it doesn't seem to change this behavior. > > This is making things sort of awkward. I can write a single 16384 > byte frame, but to read 16384 bytes I have to issue 4 reads. I seem > to only be able to read a max of 4096 bytes. I sort of need a single > read to read a single frame as I am able to do with the writes. I > don't really know if this is a synclink driver issue or something in > the tty/hdlc layer. It actually looks to me like the synclink driver > its self is OK. Am I missing something? Normal tty use (with N_TTY line discipline) limits reads to 4096 bytes because that's how big the per-tty input buffer is. The value is not configurable. Regards, Peter Hurley -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
