From mboxrd@z Thu Jan 1 00:00:00 1970 To: lapinski@ece.utexas.edu Cc: linuxppc-embedded@lists.linuxppc.org Subject: Re: kernel debugging in MontaVista Journeyman 2.0 From: Wolfgang Denk Mime-version: 1.0 Content-type: text/plain; charset=ISO-8859-1 In-reply-to: Your message of "Thu, 07 Feb 2002 19:24:02 CST." Date: Fri, 08 Feb 2002 09:11:30 +0100 Message-Id: <20020208081135.84C39109D5@denx.denx.de> Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Dear Viktor, in message you wrote: > > > We have Motorola Sandpoint with PPMC8240 and MontaVista Journeyman 2.0. > Budget constraints do not allow us to have a full version of MontaVista > Linux and I am trying to find some ways to do kernel debugging with the > Journeyman version of linux-2.4.2_hhl20. IMHO it does not matter much if you're running MV Journeyman or professional or _any_ other version of the Linux kernel. The most efficient way (IMHO) for kernel debugging is using a JTAG debugger like the Abatron BDI2000. Note that I'm talking about debugging here... > We need to perform some measurements on a network card driver. Ideally, > it would be great to obtain executuion traces (on the machine instruction Performance analysis and execution traces is a different story. > level) of different components of that driver (eventaully with timestamps) > and also (probably indirectly) measure DMA exchanges between the network > card and RAM. Setting breakpoints is also desirable. You have several options for traces / timing analysis. A pure software approach is the Linux Trace Toolkit, which can provide extremely interesting information, and it's _free_. A mixed approach (software instrumentation and hardware support for data accquisition) is CodeTEST by Applied Microsystems; it's not exactly cheap but can be used for a lot in interesting things, up to and including MC/DC code coverage; execution traces with timestamps are included, too. There are probably a couple of other tools that allow oa combination of debugging and tracing. You may want to check out tools like Lauterbach's TRACE32 for instance - but be careful to ask for Linux MMU support; I know that they have it for MPC8xx CPUs, but I'm not sure about the 82xx. > Journeyman apparently does not have KGDB support and I would highly You don't need kgdb when you have a BDM / JTAG debugger :-) > be done (besides using occiloscope or printouts and pencil). It's the > first time I am trying to get deep into the kernel so any of your > suggestions/references would be very helpful. My recommendation is to start with LTT; probably this provides all information you need, and maybe more. Wolfgang Denk -- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de Perfection is reached, not when there is no longer anything to add, but when there is no longer anything to take away. - Antoine de Saint-Exupery ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/