MR_ArPdGet
u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map);
pd0 = MR_ArPdGet(arRef, arm, drv_map);
pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
pd = MR_ArPdGet(arRef, physArm, map);
r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
pd = MR_ArPdGet(arRef, physArm, map);
pd = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
pd = MR_ArPdGet(arRef, physArm, map);
pd = MR_ArPdGet(arRef, physArm, local_map_ptr);