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- Path: d40-1.cpe.maroochydore.aone.net.au!user
- From: neilo@m140.aone.net.au (Neil O'Rourke)
- Newsgroups: comp.sys.amiga.misc,comp.sys.be
- Subject: Re: 1995 Production Status?
- Date: Fri, 26 Jan 1996 17:55:41 +1000
- Organization: Customer of Access One Pty Ltd., Melbourne, Australia
- Message-ID: <neilo-2601961755410001@d40-1.cpe.maroochydore.aone.net.au>
- References: <4de07p$bbo@bandit.cyberwar.com> <6903.6590T111T2506@ci.educ.lu> <4dk1mb$e97@Starbase.NeoSoft.COM> <4dp18h$1uq@murphy.servtech.com> <mipsyssw-2301961619070001@cyber55.imaginet.fr> <4e7kfg$12d@hermes.jersey.net>
- NNTP-Posting-Host: d40-1.cpe.maroochydore.aone.net.au
-
- In article <4e7kfg$12d@hermes.jersey.net>, dhaynie@zeus.jersey.net (Dave
- Haynie) wrote:
-
- > >How can the CHRP specifications be so well-designed that any OS will find
- > >the way to use the chips of a CHRP platform ?
- >
- > CHRP defines three basic methods for dealing with the hardware
- > resources. Certain hardware mechanisms are defined by the CHRP
- > architecture, in terms of register-level definitions; these must be
- > there, they can't be changed. This is one reason why real live CHRP
- > systems are just now becoming possible.
- >
- > A second level of motherboard resources live under the RTAS (Run-Time
- > Abstraction Services) system. These services allow
- > hardware-independent interaction with NVRAM, clocks, PCI, power
- > management, cache control, and SMP.
-
- All these abstraction layers, they have a heck of an impact on performance
- don't they? I've been following in Byte about the next MacOS release with
- full hardware abstraction, and it seems that they have to crank up the
- clock speed just to keep applications running at the same apparent speed.
-
- It seems to me that while dropping AmigaOS on to a powerPC based platform
- is a step in the right direction, making it CHRP complient will take the
- "Amiga-ness" out of the system (no blitter to bang for moving stuff, no
- audio chips to make sing, etc. etc)
-
- > >Does CHRP means that there can't be ANY custom, specialized chip on the
- board
- >
- > The final level is Open Firmware (which itself is managed by RTAS).
- > Open Firmware is a CPU-independent device driver specification, based
- > on Forth and now a standard driver type under PCI. Custom resources
- > live on the PCI bus and are supported via Open Firmware drivers.
-
- Ok, farm out the Amiga's chipset on to a PCI card? I know PCI is fast,
- but doesn't this decouple the chips from the processor, and the processor
- from the chips?
-
- Regards,
-
- Neil O'Rourke
- neilo@m140.aone.net.au
-
- TRUST NO ONE
-