s->card = sd_init(dinfo ? dinfo->bdrv : NULL, false);
s->enabled = dinfo ? bdrv_is_inserted(dinfo->bdrv) : 0;
- memory_region_init_io(&s->regs_region, &memcard_mmio_ops, s,
+ memory_region_init_io(&s->regs_region, NULL, &memcard_mmio_ops, s,
"milkymist-memcard", R_MAX * 4);
sysbus_init_mmio(dev, &s->regs_region);