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- Path: sparky!uunet!portal!cup.portal.com!Neon
- From: Neon@cup.portal.com (Anthony Joseph Bruder)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Data/Instruction Cache & BURST modes on 68030? Why/when?
- Message-ID: <72343@cup.portal.com>
- Date: Wed, 23 Dec 92 22:55:56 PST
- Organization: The Portal System (TM)
- References: <72192@cup.portal.com> <1h7vlkINNj32@hp-col.col.hp.com>
- Lines: 33
-
- >In an article posted 12/22 Dave Martin writes:
- >
- >Tony-Preston@cup.portal.com (ANTHONY FRANCIS PRESTON) writes:
- >> You should leave the setting alone! A small tutorial is in order!
- >> SetPatch will setup the system correctly so that the caches and burst
- >> are correct for the Amiga.
- >
- >The question was about setting caches for a CSA Mega-Midget Racer. Setpatch
- >may set the caches for A2620/30s and for A3000 and A4000 systems but it cannot
- >set the caches for the MMR. SETPATCH runs long before the MMR initialization
- >program. Either SETCPU (for 1.3) or CPU (for 2.0 and up) should be used to
- >change the cache states with the MMR. SETCPU was included with my MMR
- >utilities disk but nothing was explained about using it. I run CPU in my
- >user-startup to enable instruction and data caching and to copy the kickstart
- >kickstart rom to 32 bit DRAM (I have a MMU in my MMR).
- >
- >Dave Martin - dkm@col.hp.com
-
-
- Well not necessarily so. I put the MMR configuration program as the first
- entry in my startup sequence as recommended in the MMR instruction manual:
-
- c:setpatch >NIL:
- c:version >NIL:
- addbuffers >NIL: df0: 15
- addbuffers >NIL: df1: 15
-
- This allows setpatch to turn on both the instruction and data caches. In
- my system (An A500, MMR w/4Megs 32bit ram.) SysInfo shows a definite speed
- increase with both caches enabled. Turning on the burst modes has no effect
- according to SysInfo.
-
- Tony Bruder - neon@cup.portal.com
-