Alan Cox wrote:
>
> Oh god, thats the deep magic EISA weirdness department
*gnarf* ;-) Not good for a beginner like me I assume? :-(
> Well actually its one of those things that needs writing cleanly but
> currently appears in its own form in some EISA drivers
Hmm... with 'writing cleanly' you mean that there should become things
available like eisa_register_device() etc...?
> EISA slots are I/O mapped at 0x1000, 0x2000, 0x3000, 0x4000 -> 0x8000
> The ID port is at base+0xc80
> Configuration data follows at base+0xc84, 0xc88 ...
Yep, that was also what I figured out.
> I would assume the 320 byte buffer is providing this same data block, and
> maybe more but I don't know the details.
That is also what I think, but the problem is that I don't know at
which offset to look for that data...
If you look at the code:
static int getslotinfo( void )
{
static char buff[320], *s=&buff[0]; int valid;
inregs.h.ah=0xd8; inregs.h.al=0x1; inregs.h.cl=DiSC_Id.slot>>12;
inregs.h.ch=0;
sregs.ds=FP_SEG(s); inregs.x.si=FP_OFF(s);
int86x(0x15, &inregs, &outregs, &sregs);
valid=outregs.h.ah;
if(!valid) { DiSC_Id.it=buff[itconf]; DiSC_Id.dma=buff[dmachd]; }
return(valid);
}
Would it help if i told you that itconf and dmachd are defined as (see
http://mc303.ulyssis.org/heim/downloads/DISCINC.H )
#define itconf 0xb2
#define dmachd 0xc0
So if my EISA board is at 0x1000, i should be able to read these
values from 0x1000+0xb2 and 0x1000+0xc0 ??? And if 'yes', any idea
about how to read them? (byte, word, long...? My guess would be as a
byte, but I'm not sure...)
> I thought EISA boards had gone away
Unfortunately... the device I am trying to write a driver for is
especially designed for our university. Not many of those boards
exist in the world I guess :-(
(I hope that last sentence didn't take away your interest in my
project ;-)
Greetzzz,
mc303
-- Ing. Bart Vandewoestyne Bart.Vandewoestyne@pandora.be Hugo Verrieststraat 48 GSM: +32 (0)478 397 697 B-8550 Zwevegem http://users.pandora.be/vandewoestyne ---------------------------------------------------------------------- "Any fool can know, the point is to understand." - Albert Einstein - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Aug 31 2001 - 21:00:25 EST