On Thu, Jan 29, 2015 at 11:14:14AM +0000, James Hogan wrote: > Implement KGDB IO operations for MIPS Fast Debug Channel (FDC). This can > be enabled via Kconfig, which also allows the channel number to be > chosen. > > The magic sysrq hack is implemented in the TTY driver, detecting just ^C > for the KGDB channel, and ^O followed by a letter for the FDC console > channel. > > The KGDB operations are reasonably efficient thanks to the flush > callback, with a 4 byte buffer being used in both directions to allow up > to 4 bytes to be encoded per FDC word. Reading of data for KGDB will > discard any data received on other channels, which clearly isn't ideal, > but given that there is a single FIFO shared between channels we can't > do much better. > > Signed-off-by: James Hogan <[email protected]> > Cc: Ralf Baechle <[email protected]> > Cc: Greg Kroah-Hartman <[email protected]> > Cc: Jiri Slaby <[email protected]> > Cc: Jason Wessel <[email protected]> > Cc: [email protected] > Cc: [email protected]
Acked-by: Greg Kroah-Hartman <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
