To use the SIAM software, the VxWorks kernel must be able to perform
A24/D32 accesses.  You can modify your target's kernel, if necessary,
as described below.

The following instructions are for mv167 and mv177 kernels.

Change the file <vxworks_dir>/target/config/<target>/sysLib.c as follows:

        In the function sysHwInit, in the section setting up VMEbus access,
        change the lines
             *VMECHIP2_LBSAR           |= LBSAR2_AM_STD_USR_DATA |
                                          LBSAR2_D16;
        to
             /* D16 bit must be cleared to enable D32 */
             *VMECHIP2_LBSAR           &= ~LBSAR2_D16;
             *VMECHIP2_LBSAR           |= LBSAR2_AM_STD_USR_DATA |
                                          LBSAR2_D32;

        You may also wish to change the comment a few lines above:
             *   STD (A24/D16)  0xf0000000 - 0xf0ffffff
        to
             *   STD (A24/D32)  0xf0000000 - 0xf0ffffff

and make a new kernel.

From b.kolb@gsi.de (Burkhard W. Kolb) on 6-MAR-2000:

On the MVME162 the VME standard access is done via the second I/O map decoder,
not through one of the programmable map decoders. So it is necessary to disable
the second I/O map decoder and then enabled the second programmable map decoder.

In sysLib.c original version:
    temp = *VMECHIP2_LBTVCR & 0xffff0fff;
    *VMECHIP2_LBTVCR		 = temp          |
				   LBTVCR_I2SUP  |
				   LBTVCR_I2DATA |
				   LBTVCR_I2EN; 
change to

    temp = *VMECHIP2_LBTVCR & 0xffff0fff;
    *VMECHIP2_LBTVCR		 = temp; /* disable io map decoder 2 */

and then add

    *VMECHIP2_LBSAR2		= 0xf0fff000; /* start and end address */
    *VMECHIP2_LBSAR		 &= ~LBSAR2_D16;  /* no D16 as default */
    *VMECHIP2_LBSAR		 |= LBSAR2_AM_STD_USR_DATA |
					LBSAR2_D32;       /* but allow D32 */
    *VMECHIP2_LBTVCR		|= LBTVCR_EN2;    /* enable second programmable map decoder */

replace the following 2 lines 
    /* make sure map 2-4 is disabled */

   *VMECHIP2_LBTVCR		&= ~(LBTVCR_EN2 | LBTVCR_EN3 | LBTVCR_EN4);

with 
    /* make sure map 3-4 is disabled */
    *VMECHIP2_LBTVCR		&= ~(LBTVCR_EN3 | LBTVCR_EN4);