I am trying to setup Linux kernel for debugging. Linux is running on PPC 8xx, The most luck I have is with following setup. - ppcboot is installed - pImage is installed - root filesystem is mounted on NFS When not debugging, system comes up fine, etc. When debugging. I connect my bdi2000, - start bdi, start ppc - BDI>load Loading pImage , please wait .... Loading program file passed BDI>go - TARGET: target has entered debug mode - start minicom on serial, see messages from ppcboot and Linux kernel upto . . . Dentry-cache hash table entries: 2048 (order: 2, 16384 bytes) Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes) Page-cache hash table entries: 4096 (order: 2, 16384 bytes) Inode-cache hash table entries: 1024 (order: 1, 8192 bytes) POSIX conformance testing by UNIFIX Start gdb as (see below) ppc_8xx-gdb vmlinux target remote bdi:2001 I get Remote debugging using bdi:2001 0xc0004d8c in kernel_thread () at time.c:464 464 } After that if I try to set breakpoint (gdb) b send_signal Breakpoint 1 at 0xc0019128: file signal.c, line 403. (gdb)c Continuing. warning: Cannot insert breakpoint 1: Error accessing memory address 0xc0019128: Operation not permitted. Questions: (1) Why is my breakpoint not working ? (2) If I remove breakpoint, and "cont", it seems like nothing is happening. I do not see any progree on minicom screen for kernel boot up and than loading of modules and application. If I ctrl-c on gdb, I get Program received signal SIGSTOP, Stopped (signal). 0xc0003eac in idled () at idle.c:70 70 if (!current->need_resched && htab_reclaim_on) I know it is in idle thread, but not very usefull, since I cannot proceed. No telnet window, no minicom window. I am missing a step or so, any ideas what is it ? Thanks for reading this far. Usman __________________________________________________ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/