Hi Dong-In I do have -g compiler flag, but my gcc does not recognize -gdb.
Thanks Joao -----Original Message----- From: DONG-IN KANG [mailto:[EMAIL PROTECTED] Sent: Thursday, October 09, 2003 8:03 PM Subject: RE: Problem debugging ppc kernel with DDD/GDB/BDI2000 on a custom MPC8260 board Did you set the compiler flag "-g -gdb" when you configure the kernel? -----Original Message----- From: Joao Vicente Sent: Thursday, October 09, 2003 10:55 AM Subject: RE: Problem debugging ppc kernel with DDD/GDB/BDI2000 on a custom MPC8260 board I am affraid I am still unable to debug the kernel. I have tried to define the line MMU XLAT and defined the PTBASE as shown below MMU XLAT ;translate effective to physical address PTBASE 0x000000f0 ;address where kernel/user stores pointer to page table As you can see I defined PTBASE as 0x000000f0. Is this the right address for this build ? I tried it to debug the target with this configuration file but was still unable to get the symbols. I notice the BDI user manual suggests to use the following line WM32 0x000000f0 0x00000000 ;Invalidate page table base. which I also tried without success. I also got a trial version of 5.1.1 which I believe you recommended to fix a similar problem. "Wolfgang was able to point me to a trial version of gdb which reports itself as 5.1.1 but which has a patch applied that fixes the problem. I have attached this version to this email so you can try it for yourself." I am not unsure if this is relevant but this is the method I am using to build the kernel make TQM8260_config make menuconfig (where I am changing FCC, MDIO and SCC parameters only) make oldconfig make dep make uImage Do you reckon is there anything else I could try to fix this problem. -----Original Message----- From: Wolfgang Denk [mailto:[EMAIL PROTECTED] Sent: Thursday, October 09, 2003 1:38 PM Subject: Re: Problem debugging ppc kernel with DDD/GDB/BDI2000 on a custom MPC8260 board in message <DEF39A0710293E489D45B10E06645CBD0243B1A7 at dub-msx1.spectelcorp.com> you wrote: > > I am trying to boot the ppc kernel on a MPC8260 based custom board. ... > One of the doubts that I have is that when I look into the system.map > file, it shows that the start address is at 0xc0000000 (as shown > below) > > c0000000 T _start Yes, this is the correct kernel virtual address. > To the best of my knowledge the kernel image is not relocatable, so > I am wondering if this could be my problem or just one of them ... > Should the map file be showing > > 00000000 T _start No!!! > If so, where should I change the .text address so that that happens ? Don't change anything! > I am also trying to debug the code from that address with gdb/BDI2000, > but I am not getting very far. Basically I can see the program counter > incrementing when I single step, but I cannot see the source even > though I am trying to load the symbol table at 0x00000000 with the > 'add-symbol-file vmlinux 0x00000000' gdb command, after invoking gdb > from the kernel base directory (where vmlinux is) Just use the vmlinux file _without_ relocating any addresses. Make sure to enable "MMU XLAT" and define "PTBASE" in your BDI config file. ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
