Re: Linux 2_4_devel kernel hangs after control transferred from u-boot

In message [ref] you wrote:

I am trying to get a linux kernel to build and run on a Cogent CSB272
(IBM PPC 405GP processor) running a U-boot 0.4.0 bootloader. I can tftp
a uImage into ram and it passes check, but when I run bootm it
uncompresses the kernel and hangs after it starts executing the kernel
at address 0x00000000.

This is a FAQ. See
http://www.denx.de/twiki/bin/view/DULG/LinuxHangsAfterUncompressingKernel

I was given a hardhat vmlinux elf file that I can package to a uImage
and run (although it stops at the Calibrating Delay loop... Stage, but

Probably the same problem - bad parameters (clock frequencies) passed
to the kernel.

that's another issue). I need to be able to recompile a kernel for the
board and downloaded linuxppc_2_4_devel from mvista. This compiles fine
and produces a new vmlinux. I've started off by using the walnut 405
config file to build the kernel, since they're pretty similar.

Ummm... you better make sure it really matches your board. Similar is
not enough.

Any ideas where to start debugging this? I'm relatively new in embedded
stuff and linux in general, so it might be something simple, but don't
know where to start. Have a BDI2000 but no gdb driver yet, so can't put
in breakpoints etc.

??? Can't parse that.

You can use the BDI's telnet interface to set breakpoints,  too.  And
you  don;t know any special "gdb driver", as any plain GDB will allow
you to connect to the BDI which "speaks" GDB remote protocol over the
network.


Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
"Why should we subsidize intellectual curiosity?" - Ronald Reagan

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