Date: Sun, 11 Jul 2004 17:06:05 +0900 From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp> To: Marcel Moolenaar <marcel@xcllnt.net> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/dcons dcons.c Message-ID: <87iscvq87m.wl@tora.nunu.org> In-Reply-To: <20040711074901.GA55185@dhcp50.pn.xcllnt.net> References: <200407102102.i6AL2HhI040011@repoman.freebsd.org> <87llhrqaqz.wl@tora.nunu.org> <20040711074901.GA55185@dhcp50.pn.xcllnt.net>
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Thank you for your explanation. I found that the interface is very similar to the low level console interface. dcons(4) is actually character oriented and the current interface seems sufficient. /\ Hidetoshi Shimokawa \/ simokawa@sat.t.u-tokyo.ac.jp PGP public key: http://www.sat.t.u-tokyo.ac.jp/~simokawa/pgp.html At Sun, 11 Jul 2004 00:49:01 -0700, Marcel Moolenaar wrote: > > On Sun, Jul 11, 2004 at 04:11:16PM +0900, Hidetoshi Shimokawa wrote: > > I'd like to re-support remote debugging by dcons(4). > > Do you have any pointer for "new GDB debug port interface"? > > The interface is defined in src/sys/gdb/gdb.h. A good example can > be found in src/sys/dev/uart/uart_dbg.c. > > First GDB calls the probe function. The probe function is supposed > to return a priority (>=0). A negative priority means that the > debug port is dead or unusable. The uart(4) driver returns 0. So > does the sio(4) driver. If you want to give dcons priority over a > serial port, have the probe function return 1 or more. > > After all the probe functions have been called, one debug port is > seleced as the current port. The init function for that port is > called so that it can initialize itself. > > After that, the GDB backend will call the getc and putc functions > to send and receive packets. The interface is mostly character > oriented now, even though the GDB protocol is based on packets. If > this doesn't work as efficiently for firewire (or ethernet for that > matter) and have ideas to make it more friendly for you, let me > know. I welcome improvements and enhancements. > > Thanks, > > -- > Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net
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