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Problem with register cacheing in GDB
- To: <gdb at sourceware dot cygnus dot com>
- Subject: Problem with register cacheing in GDB
- From: "Peter Reilley" <micrio at mv dot com>
- Date: Sat, 9 Dec 2000 22:46:42 -0500
I am making GDB work with the Macraigor Systems Raven
JTAG debug pod under Linux. I am having a problem making the
initialization for the 860 PowerPC chip work. Specifically,
I want to write the immr register. This register can only
be accessed once after reset, after that, it becomes read only.
That one access must be a write to set the desired value.
If it is a read, then the register is set to read only and you have
lost your chance to write the register.
Is there a way to turn off register caching? Ideally, you should
be able to turn it off for certain registers that behave in an odd
way.
I have an inelegant way of doing it by fooling with the register_valid
array. There should be a better way. Remember, I am coming
in through the JTAG interface so there is no monitor running.
Thanks,
Pete.