[Coco] floppy controller update

[Gene Heskett]

On Sunday 06 July 2008, Chuck Youse wrote:
>On Sun, 2008-07-06 at 23:32 +0100, Phill Harvey-Smith wrote:
>> Yeah that seems reasonable, IIRC stock RS/Dragondos uses a 1:4
>> interleave, and most other DOSes of that vintage also seemed to use
>> interleaving other than 1:1, which is as you say prolly what Linux is
>> laying down when formatting, which is pretty much the reason that I
>> always format CoCo/Dragon disks in the actual machine and then write
>> them in Linux, because interleave is set when formatting, linux will
>> write it correctly, however it always formats with 1:1, dunno if there
>> is a way of over-riding this tho.
>
>As is typical of Linux, you can configure everything under the sun,
>except what you need.  The format interleave is more-or-less hardcoded.
>From setup_format_params() in floppy.c:
>
>    /* determine interleave */
>    il = 1;
>    if (_floppy->fmt_gap < 0x22)
>        il++;
>
>Grrrr.
>
>I wonder if I should use the extra space in this ROM (which does nothing
>but load the first 18 sectors from track 34 to $2600 and jumps to $2602)
>to add a menu of random nerdlies, including a FORMAT command.  That
>won't be all that useful after I finish the OS-9 drivers, though.
>
>Or I wonder if I should patch floppy.c in Linux.  That's the sort of
>thing that might even prove useful and should end up in the kernel
>proper.  But Linux has gotten so big these days (code-wise and
>community-wise) I don't even know who to submit the patch to.. :)
>
>C.
>
Ask on lkml, they will tell you who to send the patches to.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Q:	Why do firemen wear red suspenders?
A:	To conform with departmental regulations concerning uniform dress.