- * FIXME: this assumes the memory is mapped zero->n, which isnt
- * always true on real computers.
+ * This assumes the memory is mapped zero->n, which isnt
+ * always true on real computers. It also has some slight problems
+ * with the GART on x86-64. I've btw never tried DMA from PCI space
+ * on this platform but don't be suprised if its problematic.