On Tue, 23 Jan 2007 11:30:57 +0530 sudheer wrote: > 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). > To be correct, usually one serial is for serial console, the other-for kgdb. Yet you can either disable serial console, or have its output into kgdb. host requires only one serial to be tied on ppc_85xx-gdb. > Can anyone plz guide me how to proceed when i have only one serial > port . ? > having one serial is not a comfy case for serial kgdb. > 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. I'd consider kgdboe - it works pretty well with 8540 gianfar (or at least used to work for me so tinkering might be trivial). > > Thanks > Sudheer > > Vijay > > > > On 12/30/06, sudheer <urwithsudheer@xxxxxxxxx> 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 (root@Sudheer) (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@xxxxxxxxxx > https://ozlabs.org/mailman/listinfo/linuxppc-embedded
Attachment:
signature.asc
Description: PGP signature
