static struct map_desc rpc_io_desc[] __initdata = {
{ SCREEN_BASE, SCREEN_START, 2*1048576, MT_DEVICE }, /* VRAM */
- { IO_BASE, IO_START, IO_SIZE , MT_DEVICE }, /* IO space */
+ { (u32)IO_BASE, IO_START, IO_SIZE , MT_DEVICE }, /* IO space */
{ EASI_BASE, EASI_START, EASI_SIZE, MT_DEVICE } /* EASI space */
};