On Fri, Sep 12, 2014 at 11:15:22PM +0100, James Hogan wrote: > Currently the metag_da console channel is write only, it doesn't get > polled for incoming data. This is for performance & latency reasons as > polling blocks the processor for a significant amount of time waiting > for the JTAG probe to respond to the request and restart the thread. > This means that the console channel cannot be used for a login prompt, > so ttyDA2 is usually used instead. > > In a virtual environment with a virtual DA such as QEMU however the > polling is much cheaper as the request can be handled immediately. It is > useful to be able to enable polling in such an environment in order to > get both the kernel log and a usable login prompt on the same DA > channel. > > Add a console_poll module parameter which allows polling to be enabled > for the console channel. It defaults to off as that is the current > behaviour for good reason on real hardware. > > It can be enabled by appending metag_da.console_poll to the kernel > command line. > > Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Cc: Jiri Slaby <jslaby@xxxxxxx> > Cc: Guenter Roeck <linux@xxxxxxxxxxxx> Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx> Thanks a lot! Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-metag" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
