From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3D1897FC.D7D7C5B2@mvista.com> Date: Tue, 25 Jun 2002 09:19:08 -0700 From: Frank Rowand Reply-To: frowand@mvista.com MIME-Version: 1.0 To: Matt Porter Cc: linuxppc-dev@lists.linuxppc.org Subject: Re: Move kgdb init code? References: <20020624221020.A14330@home.com> Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Matt Porter wrote: > > Hi all, > > I've created a generic ns16550 binding to kgdb in hopes of making > enabling kgdb support less of a per-board hack. It utilizes the > information populated in rs_table to configure the UARTs (code > stolen from a number of our other polled 16550 code areas). The > only problem is that for systems that use early_serial_init() to > configure serial port usage, the current location of the kgdb > init code is not suitable. early_serial_init() is run during > during a port's ppc_md.setup_arch if it is being used and so > requires the the kgdb initialization be performed after > ppc_md.setup_arch runs. Is the concern that early_serial_init() will change the UART's configuration, if kgdb initializes it earlier? Or something else? > > Since I don't personally use kgdb on a day-to-day basis, I'm > wondering what most people use it for. I would guess that it > is not typically used for board bringup since it is available > so late in init code (and progress messages are available even > earlier if one can't/won't use a hardware debugger). If most When I was doing board bringups, I used kgdb for 95% of my debugging. It has always been a struggle (in various OSs that I have worked on) to get a software based kernel debugger initialized as early as possible in the boot sequence. For 4xx and 8xx, kgdb is available fairly early (very soon after going virtual). > people are using it for device driver debug, then it doesn't > seem that moving the init code after ppc_md.setup_arch would > be a problem. It would enable kgdb in a more general purpose > way with the generic 16550 support, and somebody doing new > bringup could always move the init code earlier for their > specific case. > > Any objections or alternatives? yes (objection). > > Thanks, > -- > Matt "I use a BDI2000" Porter > porter@cox.net > This is Linux Country. On a quiet night, you can hear Windows reboot. -Frank -- Frank Rowand MontaVista Software, Inc ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/