RE: [N8VEM-S100:249] Bootstrapping Lunux on the S100/68K...

["Andrew Lynch" <lyn...@yahoo.com>]

Hi!  Thanks!  Yes, the S-100 EPROM boards do support SRAM, EEPROM, Flash,
etc chips in addition to EPROM.  You can have up to 2MB of Flash or SRAM on
the EPROM board in addition to a legacy boot ROM like a 27C256 or 27C16.

Thanks and have a nice day!

Andrew Lynch

> -----Original Message-----
> From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
> Behalf Of Pontus Oldberg
> Sent: Friday, June 03, 2011 5:38 AM
> To: n8vem...@googlegroups.com
> Subject: Re: [N8VEM-S100:249] Bootstrapping Lunux on the S100/68K...
> 
> Mike,
> It sounds like you are on the right track, start simple and build from a
> working solution.
> 
> I'm not sure about the memory though. Why not have a simple boot loader
> and use one of Andrews IDE cards and load the kernel from a flash card at
> startup?
> 
> If you're going for a flash solution, Andrew's EPROM/SRAM card should be
> able to hold 4pcs 4Mbit flash devices. If not directly, it should only
> require minor mods.
> 
> /Pontus
> 
> mike <mi...@pikeaero.com> wrote:
> 
> >-----BEGIN PGP SIGNED MESSAGE-----
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> >
> >G'Day all,
> >
> >I spent a bit of time last night planning my approach on the
> >Linux/68K/S-100 bootstrap solution.
> >
> >I think I would like to break it down into three distinct phases with
> >the ultimate goal of a full fixed-disk bootable Linux with memory
> >management.
> >
> >So starting with a baby step, phase 1 would look something like this:
> >
> >1) Build a bare-bones XIP -mcpu=68000 -nommu kernel with:
> >   1.1) No-MMU support.
> >   1.2) Hack up a device driver for the Interfacer-4 async card.
> >   1.3) PPP/SLIP kernel module linked in.
> >   1.4) RAM disk kernel module linked in.
> >   1.5) Implement some kind of h/w timer + kernel support.
> >
> >So the only 'experimental' kernel code at this stage is the serial port
> >driver (hack an existing UART driver), and the clock tick interrupt,
> >both very straight forward to implement.
> >
> >With an XIP kernel I don't have to worry about the complications of the
> >bootstrap loader, never mind even a disk i/o device, device driver,
> >right off the bat.
> >
> >In any case, getting that far, I would then have a working kernel in ROM
> >that I could then proceed to further bootstrap from.
> >
> >So I'm looking at the N8VEM/S100Computers.com ROM/RAM cards, so I would
> >love to get some input from someone more senior with respect to
> >experience with these cards...
> >
> >Let's say I want to have 16MB total memory, with minimum 2MB ROM
> >(preferably FLASH), 4M would be bonus, to store the uncompressed XIP
> >kernel and static data. Let's say I'm looking for the optimum
> >combinations of cards to accomplish that in terms of bus slots.
> >
> >I've started puzzling over it a little bit, I just thought if one of you
> >more senior guys might have some input that is not readily obvious.
> >
> >Kind Regards,
> >
> >Mike Sharkey
> >
> >
> >
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