Date: Wed, 13 Aug 2003 21:03:32 +1000 From: Peter Grehan <grehan@freebsd.org> To: Morton Lin <mtlin1@ms36.hinet.net> Cc: freebsd-ppc@freebsd.org Subject: Re: Porting FreeBSD to PowerPC 860 ? Message-ID: <3F3A1B04.97E86EC0@freebsd.org> References: <01ac01c36171$28ade6b0$0655608c@mtlin>
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Hi Morton > I had an EmbeddedPlanet PowerPC 860 evaluation board and ICE device. > (EmbeddedPlanet SBC 860 H EP862-1.1 and BDI 2000) ... > I want to know does anyone work on it already ? And what's > information and knowledge I should to learn and dig ? Is there > any code base already I can develop depend on it ? I think the > problem is I am not very familiar with FreeBSD kernel hacking. The 860 is quite different than the G3/G4 processors currently supported by the port - no BAT registers - the MMU is a simple TLB, unlike the OEA h/w tablewalk in the G3/G4 - no floating point - a huge amount of system-on-chip logic and peripherals It will be quite a lot of work to get FreeBSD running on an 860, but I have one, and it is my long term goal. I greatly encourage you to join in the fun :-) The NetBSD port to the IBM 4xx is a good place to start: the 4xx is similar to the 860 in that there is only a TLB for addr translation, and it has no floating point. A lot of device driver work needs to be done to support the inbuilt peripherals. Also, the current port is closely tied to OpenFirmware - that has to be split out, and you have to find a way to get the loader to run. I'm not sure what ROM monitor the EmbeddedPlanet boards have, but if it's U-Boot, then there is a bit of work to be done to interface FreeBSD's loader to it. later, Peter.
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