PRU_IOMEM_IRAM
if (da + len <= PRU_IRAM_DA + pru->mem_regions[PRU_IOMEM_IRAM].size) {
va = (__force void *)(pru->mem_regions[PRU_IOMEM_IRAM].va +
switch (pru->mem_regions[PRU_IOMEM_IRAM].pa & PRU_IRAM_ADDR_MASK) {