RE: Anyone using an IBM RISCWatch ICE?

Sigh.  As is all too often the case, it was an example of user error
(mine).  I thought I was setting a hardware breakpoint, but I
misunderstood the RISCWatch interface and was actually trying to set
a software breakpoint.  Once I followed Frank's directions, things
worked great.  (I figured I must be doing SOMETHING wrong; this one
was too severe not to have been seen already if it were a real bug.)

Thanks,

  -- David Wright

quoted

Hi,

I've been attempting to use an IBM RISCWatch ICE on a Walnut system
and I'm having problems.  (Spare me any lectures about how I should
be using a BDI.  I'm just trying to find out how usable the IBM is,
since it's already here.)

The specific problem I'm trying to solve is this:  how do I set a
breakpoint early in kernel startup, say at start_kernel (just as
the MMU is enabled)?  I've tried booting the Walnut so that it
comes up into its ROM monitor, then stopping it with the ICE, and
setting a hardware breakpoint at the start_kernel virtual address.

The disk in the PC that hosts my RISCWatch crashed yesterday so I'm
doing this from memory.

I've done that sort of thing quite often.  OpenBios is sitting
at the menu prompt,

  RW> stop
  RW> bp set ihw 0xc015a644
  RW> run

(0xc015a644 is start_kernel)

Then tell OpenBios to boot the kernel.

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