Re: [PATCH 2/2][v3] Add SWIM floppy support for m68k Macs.

[Brad Boyer <flar@allandria.com>]

On Sun, Nov 09, 2008 at 10:06:08PM +0100, Laurent Vivier wrote:
> Le 9 nov. 08 à 20:42, Geert Uytterhoeven a écrit :
> > It prevents the driver from working if you have multiple SWIM devices.
> 
> If we have multiple SWIM devices the driver is only able to know the  
> base address of the onboard controller.
> So, it manages only one.

There is never a second SWIM chip. However, there is one system
(the unsupported Mac SE) that can have 3 floppy drives attached
to a single SWIM chip. It's unlikely to ever be supported in
Linux due to using a 68000 CPU rather than a 68020 or 68030.

Geert's suggestion would be the ideal thing in my opinion even
though we know there are never multiple chips, but I think it's
a low priority.

> > Didn't I read something about SWIM chips on expansion cards?
> 
> I think you speak about the expansion card for the MacII allowing to  
> replace the WIM controller by a SWIM one, but what I understood is the  
> SWIM replaces the WIM at the same base address. Moreover the SWIM has  
> a WIM compatibility mode: it's why I've added the set_swim_mode() and  
> get_swim_mode() to detect in which case we are. But there is only one  
> controller at a time.

I think the discussion in question was the one about adding a nubus ESP
driver for SCSI expansion cards. That was pretty recent.

You are right that there is just a single socket for the floppy controller
on the Mac II and the upgrade replaces the old chip with a new one.

	Brad Boyer
	flar@allandria.com

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