From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <8833366b40e670d39b9a61dcab5b04a2@plan9.bell-labs.com> Date: Wed, 5 Jan 2005 16:41:52 -0500 From: jmk@plan9.bell-labs.com To: 9fans@cse.psu.edu Subject: Re: [9fans] RAM - 2 segments In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Topicbox-Message-UUID: 273280a4-eace-11e9-9e20-41e7f4b1d025 On Wed Jan 5 16:13:57 EST 2005, newsham@lava.net wrote: > When initializing physical RAM, the mach specific code fills in > two region descriptors which the port code uses. Has there been > much thought into supporting more than two regions? Has this > come up with any platforms previously? The machine I'm working > on currently has 512MB split up into 4 non-contiguous banks of > 128MB a piece. I can currently only use half of the RAM due > to this restriction. > > Tim N. Yes, I have thought of fixing that often over the years and have it down for the next port we do. It has caused problems in the past (Sparc?), which we ignored. The current scheme dates, I think, from the original Gnot terminal.