Date: Sun, 26 Nov 1995 09:52:41 +0100 (MET) From: grog@lemis.de (Greg Lehey) To: graichen@julia.physik.fu-berlin.de (Thomas Graichen) Cc: hackers@freebsd.org (FreeBSD Hackers) Subject: Re: any eprom guru out there ? Message-ID: <199511260852.JAA13099@allegro.lemis.de> In-Reply-To: <199511251452.PAA04145@julia.physik.fu-berlin.de> from "Thomas Graichen" at Nov 25, 95 03:52:53 pm
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Thomas Graichen writes: > > has anybody some deeper experience with boot-eproms and the netboot > FreeBSD-code ? - my problem is that i want to make a boot prom for a > smc-elite 16 plus card - the docs say: the chip is 27512 and the rom > window size is 16k - but the 27512 is a 64k chip - now my question - > is it possible to burn the standard FreeBSD boot-rom code (which is > 16k by default and will fail with ROMSIZE set to 64k - due to a .word > ROMSITE in start2.S) into the 64k eprom or can i use 16k eproms > (27128) in the smc-elite 16 plus card ? I'm not too sure I understand the question. Obviously, you can fit the bootstrap into your PROM, and it will run from a larger PROM, just like adding another 64 MB of main memory to your machine won't stop it from running FreeBSD. I've had a look at the code, and it only refers to ROMSIZE once, in order to move the contents to RAM--apparently it executes it as a .COM file. I don't see why this should fail just because there's another 48 kB of empty space behind it. Or have you tried and failed? Beware of setting ROMSIZE to 65536 in the Makefile, however. This is 16 bit code, and your .words are 16 bits too. Greg
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