Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!floyd!harpo!utah-cs!utah-gr!thomas From: thomas@utah-gr.UUCP (Spencer W. Thomas) Newsgroups: net.unix-wizards,net.periphs Subject: Re: Booting Unix off Fujitsu Eagles Message-ID: <1076@utah-gr.UUCP> Date: Thu, 9-Feb-84 18:21:02 EST Article-I.D.: utah-gr.1076 Posted: Thu Feb 9 18:21:02 1984 Date-Received: Fri, 10-Feb-84 07:14:06 EST References: allegra.2272 Lines: 11 There was a bug in pre-4.2 bootstraps for the Fuji. (Other problem was you had to throw out other drives to fit the fuji into 512 bytes.) The "driver" in the bootstrap program spins on drive ready to decide when a transfer has completed. However, the fuji is so fast that this comes up well before the data has actually made it into memory. You need to change that code to spin on controller busy instead (and invert the sense of the test). We had the weird situation where it would boot without the FPA, but not with! Not having the FPA slowed the CPU down enough that it was (usually) ok. =Spencer