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On Mon, 24 Jan 2000, Aaron J. Grier wrote: > On Mon, Jan 24, 2000 at 12:34:31PM -0500, Quality Quorum wrote: > > > I am sick an tired of various BDMs to the extent that I am going to > > put together BDM interface implemented by FPGA/CPLD which will work > > over standard EPP port, and I am going to make verilog/vhdl code for > > the thing available along with gdb target code supporting it. > > Don't reinvent the wheel... There's already a plethora of BDM > interfaces out there including, but not limited to > > - motorola two-chip PD interface > - public five chip interface > - P&E ICD interface I am using it under LInux with modified driver by G.Magin - it works more or less OK,however, I would prefer to live without kernel support. > - Pavel Pisa's(?) P&E clone(?) (16v8 PAL based) > - various other commercial solutions from EST, softaid, and god knows > who else... > > and this is just CPU32... I have no idea if any of these work with > Coldfire or PowerPC. > > the two-chip is unsuitable due to timing issues. > the five-chip is unsuitable if you want control over the BERR\ line. [1] > the P&E/Pavel Pisa ICD interface lacks a clean driver. [2] > > Ideally support for all of these could be put under the same driver > structure and distributed WITH gdb, or at the very least folded under > the same set of patches. [3] > > [1] I was in the process of modifying my five chip to allow direct > banging of BERR\, when a working BDM interface box from EST showed > up on my desk. Pricy thing, but it works without me having to > fiddle with it. I've been trying to get a working CPU32 BDM > interface under linux now for about two and a half months. I'm > certainly no hardware expert or programming wizard, but it seems > like in the time the 683xx line of CPUs have been out, a > free-software/hardware geek ought to have put something together > that works. I guess there's far less people designing embedded > systems in their living rooms than are hacking on free software... > ;) > > [2] of the two linux BDM drivers sets I've seen, the Chris Johns / Eric > Norum driver appears to be the cleanest. I'd suggest using it as > the base from which to hack on... > My primary goal is BDM on mpc860 where requirements are more demanding and wiggler is a pain to dela with from under gdb. > -- > Aaron J. Grier | Frye Electronics, Tigard, OR | aaron@frye.com > "The simplistic anthropomorphism which asserts that source code has a > life separate from its creator or maintainer is the product of one > too many viewings of Tron." -- paraphrasing of anonymous post on /. > Thanks, Aleksey ------ Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ Want to unsubscribe? Send a note to crossgcc-unsubscribe@sourceware.cygnus.com
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