> -----Original Message----- > From: openocd-development-boun...@lists.berlios.de [mailto:openocd- > development-boun...@lists.berlios.de] On Behalf Of Freddie Chopin > Sent: zaterdag 18 juli 2009 16:07 > To: openocd-development > Subject: Re: [Openocd-development] Strange problem with LPC2103 > > I found some time to investigate that problem. > > Nico Coesel pisze: > > At which frequency is your LPC2103 running and which core voltage? > > After reset 12MHz and the voltages are standard - 3.3V an 1.8V. After > some inits - 72MHz (max). > > > At higher frequencies the chip may show strange behaviour due to the core > > supply voltage dropping too much (NXP has an errata sheet on this). > > I've checked that, but my revision of LPC2103 doesn't have that bug. > Moreover - the code works perfectly in "normal" conditions - that > failure is there ONLY when debugging. > > What actually helped was specifically disabling MAM via GDB after reset. > The soft_reset_halt doesn't do that, and that was the problem. I need to > add: > > monitor mww 0xE01FC000 0 > > to a GDB startup commands and then everything is fine. > > Do you think that disabling MAM should be added in some way to > soft_reset_halt procedure?
Did you try to relax the MAM timing (more waitstates)? The errate sheet does mention some problems with the MAM without a work around. I don't know if switching off the MAM is something that you want. This slows the device down considerably so you are not debugging the software at it actual speed. Nico Coesel _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
