To test the theory of memory locations I borrowed some more
RAM. I can confirm that in a Sun IPX the following memory
configurations work
Bank 0 16Mb 16Mb 16Mb
1 16Mb 4Mb 16Mb
2 4Mb 4Mb
3 4Mb 4Mb
And that the following DOES NOT work
Bank 0 4Mb
1 4Mb
2 4Mb
3 4Mb
[Gives Data Access Exception on loading Ramdisk]
My other problem turns out to be that the Sun has two framebuffers,
an onboard CG6 (which developed a fault) and a CG3 in an SBUS slot.
Bootwas from this second CG3 in the sbus slot; however I saw nothing
because all the linux kernel output was on the CG6 on the M/B.
At the very least these would be useful FAQ entries! I have a lot of
machines with two framebuffers, usually IPCs which has a colour CG3
added to supersede the on board BW2. I suspect this could show the
same trouble.
Incidentally the IPC memory is configured as 3 banks of 4Mb and this
generates the same problem.
Alan Bain
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