* Deskstations or Acer PICA but not the much more versatile DMA logic used
* for the local devices on Acer PICA or Magnums.
*/
-#ifdef CONFIG_SGI_IP22
-/* Horrible hack to have a correct DMA window on IP22 */
-#include <asm/sgi/mc.h>
-#define MAX_DMA_ADDRESS (PAGE_OFFSET + SGIMC_SEG0_BADDR + 0x01000000)
+#if defined(CONFIG_SGI_IP22) || defined(CONFIG_SGI_IP28)
+/* don't care; ISA bus master won't work, ISA slave DMA supports 32bit addr */
+#define MAX_DMA_ADDRESS PAGE_OFFSET
#else
#define MAX_DMA_ADDRESS (PAGE_OFFSET + 0x01000000)
#endif