Subject: Re: Support for new Dual G4 1 Gig machines?
From: Holger Bettag (hobold@Informatik.Uni-Bremen.DE)
Date: Tue Jan 29 2002 - 08:01:08 MST
Apparently the GHz Macs use a new CPU variant, the MPC7455. It differs
very slightly from the earlier CPUs in that it has
- a feature to lock parts of the L1 data cache (can probably be ignored)
- some extra SPRGs (can probably be ignored)
- 4 additional DBATs and 4 additional IBATs. I am not sure if those
require initialization at early startup to not interfere with later
operation.
The real difference is in fabrication; it is the first SOI part.
Some official info here (beware of line wrap):
http://e-www.motorola.com/webapp/sps/site/prod_summary.jsp?code=MPC7455&nodeId=03M943030450467M986
Holger
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