Using gdb to boot kernel.

Hi All,
dowloading using gdb for booting kernel form www.linux-sh.org, I read to set 
the kernel with thr potion kernel hacking: use linux sh standar bios setting 
the GDB stub VBR at the sh-ilp+g base address. But in the kernel I'm using 
now (2.4.21) I cannot to set such a VBR value. How can I set such a value? 
Why in such a version it is not more required?

Thanks a lot

Fabio


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