Ok, here is a context diff from the original clock.c source
(nothing special really). It works on my 2000, dunno about
3000 or 4000. Check it out and report.

(patch with `patch /sys/arch/amiga/dev/clock.c <THIS_FILE')

--- snip ---

*** clock.c.orig	Fri Jun 17 12:13:36 1994
--- clock.c	Sun Nov  6 00:09:36 1994
***************
*** 764,771 ****
  	 * there seem to be problems with the bitfield addressing
  	 * currently used..
  	 */
- return(0);
- #if not_yet
  	if (rt)
  		return 0;
  
--- 764,769 ----
***************
*** 807,813 ****
  	day1 = day / 10;
  	day2 = day % 10;
  
! 	rt->control1 = CONTROL1_HOLD_CLOCK;
  	rt->second1 = sec1;
  	rt->second2 = sec2;
  	rt->minute1 = min1;
--- 805,811 ----
  	day1 = day / 10;
  	day2 = day % 10;
  
! 	rt->control1 = A3CONTROL1_HOLD_CLOCK;
  	rt->second1 = sec1;
  	rt->second2 = sec2;
  	rt->minute1 = min1;
***************
*** 820,829 ****
  	rt->month2  = mon2;
  	rt->year1   = year1;
  	rt->year2   = year2;
! 	rt->control2 = CONTROL1_FREE_CLOCK;
  
  	return 1;
- #endif
  }
  
  long
--- 818,826 ----
  	rt->month2  = mon2;
  	rt->year1   = year1;
  	rt->year2   = year2;
! 	rt->control2 = A3CONTROL1_FREE_CLOCK;
  
  	return 1;
  }
  
  long
***************
*** 915,922 ****
  	 *
  	 * XXX Check out the above where we (hour1 & 3)
  	 */
- return(0);
- #if not_yet
  	if (! rt)
  		return 0;
  
--- 912,917 ----
***************
*** 961,967 ****
  	/* 
  	 * XXXX spin wait as with reading???
  	 */
! 	rt->control1 = A2CONTROL1_HOLD_CLOCK;
  	rt->second1 = sec1;
  	rt->second2 = sec2;
  	rt->minute1 = min1;
--- 956,962 ----
  	/* 
  	 * XXXX spin wait as with reading???
  	 */
! 	rt->control1 |= A2CONTROL1_HOLD;
  	rt->second1 = sec1;
  	rt->second2 = sec2;
  	rt->minute1 = min1;
***************
*** 974,981 ****
  	rt->month2  = mon2;
  	rt->year1   = year1;
  	rt->year2   = year2;
! 	rt->control2 = CONTROL1_FREE_CLOCK;
  
    return 1;
- #endif
  }
--- 969,975 ----
  	rt->month2  = mon2;
  	rt->year1   = year1;
  	rt->year2   = year2;
! 	rt->control2 &= ~A2CONTROL1_HOLD;
  
    return 1;
  }