Re: bdi2000 + mpc8560ads, very early breakpoints
From: Kylo Ginsberg <hidden>
Date: 2005-04-13 19:29:28
Thanks; that was instructive. I hadn't read up on the 85xx debug exceptions yet. For posterity, my issue was that even though the code is running out of ddr at this stage, u-boot has left the IVPR pointed at flash. So once head_e500.S invalidated the tlb entry for the flash region, the debug exception vector was inaccessible and a breakpoint sent the processor off the road. As a workaround, I modified u-boot to re-point IVPR when it relocates itself into ddr. Cheers, Kylo Fahd Abidi wrote:
Try the suggestions pointed out in here: http://www.ultsol.com/faq-P308.htm This is based off suggestions from another customer. Let me know if this works for you or not. Fahd -----Original Message----- From: Kylo Ginsberg [mailto:kylo@veriwave.com] Sent: Tuesday, April 12, 2005 3:21 PM To: linuxppc-embedded@ozlabs.org Subject: bdi2000 + mpc8560ads, very early breakpoints I'm running a bdi2000 (with mpc85xx-gdb f/w 1.03) with a mpc8560ads target, and I'm trying to set breakpoints early on in linux startup (in the head_e500.S code that sets up tlb's). I'm setting the breakpoints from within the bdi telnet interface. I can: --succesfully hit a breakpoint set up to any instruction <= the address of the first 'tlbwe'. --single step (with the bdi "TI" command) past that 'tlbwe' as far as I've cared to try I cannot: --hit a breakpoint once the first 'tlbwe' has executed. If I attempt to do so, linux startup doesn't proceed, I lose further communication with the target and the BDI claims "COP Freeze" and I have to reset the target. Btw, the 'tlbwe' in question marks invalid the first tlb1 entry setup by u-boot, which pointed at flash address space. Code is running out of ram at this point. I'm probably missing something very basic here. Any ideas? Thanks, Kylo _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded