Path: chuka.playstation.co.uk!news1.scei.co.jp!scea!greg_labrec@interactive.sony.com
From: shawng <shawng@concentric.net>
Newsgroups: scea.yaroze.programming.gnu_compiler
Subject: Re: which code space to use?
Date: Sat, 03 May 1997 21:58:54 -0500
Organization: SCEA Net Yaroze News
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References: <3361C44A.63E0@charlie.cns.iit.edu> <33693C54.4A18@glamoursoft.com>
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Yellow Manual Quote:

Logical memory		Seg name	I Cache
0x00000000-0x001fffff	ku		Available	
0x80000000-0x801fffff	k0		Not available
0xa0000000-0xa01fffff	k1		Available

Is this a misprint? I've also noticed all the demos using segment k0.

Mike Fulton wrote:
> 
> Ed, I don't have a yellow manual in front of me to double check what it
> actually says, but you've got it backwards.  Any instruction with a high
> nybble value of 0x00 or 0x08 will be cached.  Any instruction with a
> high nybble value of 0xa0 will NOT be cached.
> 
> You can use this information and techniques using function pointers to
> exercise some control over what routines are executed using the cache
> and which are not.
> 
> Mike Fulton @ SCEA
> 
> Ed Federmeyer wrote:
> >
> > I noticed that the demos all link starting at address 0x8------- (k0
> > space), but on page 15 of the Yellow 'User Guide', it seems to indicate
> > that code running out of this space does not use the Instruction cache
> > of the CPU.  (The chart on that page says "Not available" under the
> > I-cache column for k0 space.)
> >
> > EdF