RTEMS and Motorola 68000

[Thomas Doerfler]

Hello Cederic,

I have used it with a MC68332 and a MC68302, both 
have smaller address busses. Keep in mind that the 
internal architecture still uses 32 bit addresses, 
but the uppermost bits are not visible to the 
outside.

So I think there is no real probem with a 22bit 
address bus.

wkr,
	Thomas.

> Hi?
> 
> Thanks a lot for your information. 
> But does anyone have any experience of
> use a real 68000 with 22 bit adress bus
> with RTEMS ?
> 
> Thanks
> 
> Cedric
> 
> > -----Original Message-----
> > From: Nicco [mailto:pigeon.nicolas at wanadoo.fr]
> > Sent: Friday, June 27, 2003 5:32 PM
> > To: cedric_aubert at yahoo.fr
> > Cc: RTEMS Users
> > Subject: RE: RTEMS and Motorola 68000
> > 
> > 
> > Hi,
> > 
> > I'm currently using RTEMS with a 68302 processor,
> which does not have a
> > 22 bits wide address bus. The core of this processor
> is a 68000, and it
> > works pretty well. I advise you to start with a BSP
> for the 68302, such
> > as ods68302 or gen68302, and remove some processor
> specific parts. Be
> > careful with your GCC too, some old versions may
> introduce illegal
> > instruction (that are OK on a 68020 but not on a
> 68000).
> > 
> > Hope this helps...
> > 
> > 
> > -----Original Message-----
> > From: Cedric Aubert [mailto:cedric_aubert at yahoo.fr] 
> > Sent: vendredi 27 juin 2003 14:21
> > To: RTEMS-USERS
> > Subject: RTEMS and Motorola 68000
> > 
> > Hi,
> > 
> > I am new to the list and to rtems to.
> > I want to known if RTEMS have support
> > for motorola 68000 processors.
> > 
> > I have found that it's should work with
> > 68k processor, but I found on the documentation
> > that it's ok for 68xxx and 683xx but it's write
> > like 68020. But I use a real 68000 the first of
> > motorola (at 16Mhz), not the 32 bits adress bus
> > processors.
> > The 68K, I use it's the adress bus had 22 bits.
> > Of course without MMU.
> > 
> > Is RTEMS support the first mc68000 processor ?
> > 
> > Sorry if my question is stupid but many system
> > support 32bits 68k but not the 22bits 68k (ucLinux
> for
> > example, if I don't lose my mind :-).
> > 
> > Thanks a lot
> > 
> > ---
> > AUBERT Cedric
> > SDEL Controle Commande
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> > 
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> > Fax : +33 (0)2 40 84 51 10
> > 
> > E-mail : cedric_aubert at yahoo.fr
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> > 
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--------------------------------------------
IMD Ingenieurbuero fuer Microcomputertechnik
Thomas Doerfler           Herbststrasse 8
D-82178 Puchheim          Germany
email:    Thomas.Doerfler at imd-systems.de
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