Vijay Sampath wrote: > Sorry no idea. The configuration and options for kgdb are different in > my architecture. In make menuconfig, under "Kernel Hacking', I enable > kgdb and choose its serial port (ttyS0 or ttyS1). After this if I just > pass a string with "kgdb" in it in the commandline, it halts early on. > Looks like kgdb function is different in your architecture. You will > have to read the code that implements your kgdb setup. Clearly it is > not happy with the arguments you are passing it, as evident in the > output. > > BTW I am using Linux kernel version 2.6.16 on a IBM405EP board. kgdb > breakpoint is setup in setup_arch() in arch/ppc/kernel/setup.c. Note I > also enabled CONFIG_WANT_EARLY_SERIAL in the processor configuration. > Not sure if this is important. > In my setup i have one serial port on the target(MPC8540) and one on host(x86). The document(kgdb_docu_full-2.4.pdf) by default considers having two serial ports(two on target and two on host).
Can anyone plz guide me how to proceed when i have only one serial port . ? I want to know the initilization steps for estrablishing the serial communication between kgdb(in target) and gdb on host. I tried one or two ways but couldnot succeed. Thanks Sudheer > Vijay > > On 12/30/06, sudheer <[EMAIL PROTECTED]> wrote: >> Vijay, Thanks for the reply. >> But before trying these options i want to clear one more issue. >> While booting the kgdb kernel the kernel claims "kgdb initialisation >> failure." I have observed it very lately. >> >> Memory CAM mapping: CAM0=256Mb, CAM1=0Mb, CAM2=0Mb residual: 0Mb >> Linux version 2.6.15.5 ([EMAIL PROTECTED]) (gcc version 3.4.4) #2 Fri Dec >> 29 17:58:40 IST >> 2006 >> KGDB cannot initialize I/O yet. >> Invalid syntax for option kgdb8250= >> Malformed early option 'kgdb8250' >> Built 1 zonelists >> Kernel command line: console=ttyS0,115200 root=/dev/ram rw kgdbwait >> kgdb8250=0,115200 >> OpenPIC Version 1.2 (1 CPUs and 60 IRQ sources) at fcfbb000 >> PID hash table entries: 2048 (order: 11, 32768 bytes) >> Dentry cache hash table entries: 65536 (order: 6, 262144 bytes) >> >> >> >> >> I have changed the kgdb8250 arg to 1,0, but the result is same. >> And ...... >> I have checked the serial cable NULL Mode connecting x86 systems >> serially- with Cat and echo and this is fine. >> When i try with Unpatched kernel on target and host(x86) - cat < >> /dev/ttyS0 doesnt wait and returns to prompt. >> I tried with 2.6.13 and 2.6.15.5 with resepective kgdb patches, but the >> result is same (kgdb Initialization failure). I am not sure where am >> doing the mistake. >> Please guide me in right way and also please let me know if any more >> details are required. >> Happy New Year in Advance. >> >> Thanks >> Sudheer >> >> >> >> >> >> > _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
