Messages in this thread | | | Date | Thu, 26 Mar 2015 16:09:20 +0100 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH 9/9] ttyFDC: Implement KGDB IO operations. |
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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 <james.hogan@imgtec.com> > Cc: Ralf Baechle <ralf@linux-mips.org> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > Cc: Jiri Slaby <jslaby@suse.cz> > Cc: Jason Wessel <jason.wessel@windriver.com> > Cc: linux-mips@linux-mips.org > Cc: kgdb-bugreport@lists.sourceforge.net
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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