* 7450 L3 undocumented register
@ 2002-02-17 12:49 Benjamin Herrenschmidt
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From: Benjamin Herrenschmidt @ 2002-02-17 12:49 UTC (permalink / raw)
To: linuxppc-dev
Hi !
I'm working on L3 setup/enable code for the 745x CPUs (in order to properly
configure the second CPU L3 of Apple's Dual G4s). I've studied Apple's darwin
code and it makes use of a register that isn't documented in the 7450UM rev.2
It's SPR 984, called L3PEDT.
Anybody has a clue about it ? I also noticed that their
flush/disable/invalidate/enable sequence is a bit different that what is
documented in the above manual, they additionally tweak the MSSSR0 L3TAG
bit (possibly to clear a transcient error) and they set both L3CR data only
and instruction only bits.
So anybody has a clue about what should actually be done ?
Ben.
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