Date: Fri, 27 Feb 2004 17:11:24 +1000 From: Peter Grehan <grehan@freebsd.org> To: Suleiman Souhlal <refugee@segfaulted.com>, freebsd-ppc@freebsd.org Subject: Re: G5 Message-ID: <403EED9C.3040701@freebsd.org> In-Reply-To: <20040227013151.250b0d3d@zZzZ.segfaulted.com>
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Hi Suleiman, > I just have a few quick questions regarding booting on the G5s: > How far does it get? The boot loader works, but I'm still trying to get pmap_bootstrap sorted out. It's going to take a while :-( The hash table for the G5 is the 64-bit version, but if you run in 'bridge' mode, segment registers can still be used. Check out the IBM doc for details: http://www-306.ibm.com/chips/techlib/techlib.nsf/techdocs/F6153E213FDD912E87256D49006C6541 Fortunately the work needed to abstract out the hash-table differences can be used in PPC implementations that don't have a hash table, such as the IBM 4xx and Motorola 8xx series, which I'm very interested in. I think I'll set up a P4 depot to track the changes I'm doing for this. > Are you trying to boot in 32-bit mode or 64-bit mode? 32-bit mode. 64-bit mode is a hell of a lot of work with toolchain, ld.so, exec, openfirmware callbacks etc, whereas 32-bit mode is mainly vm/trap work. Plus, it should produce a kernel that can run on G3/G4/G5, which I think is a better place for the project than immediately starting a 64-bit port before the 32-bit port is stable. > Does 32-bit mode need a toolchain that supports ppc64 anyway? There might be some config mods needed, but yes, I think the 32-bit toolchain could support 64-bit mode as well. later, Peter.home | help
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