On 17/11/2016 14:05, Måns Rullgård wrote: > I don't see why the sbox needs to be configured first. It's just a > crossbar switch, and until something starts actually issuing requests, > it shouldn't matter how it is connected. If the NAND controller starts sending to an uninitialized SBOX, then (IIUC) some bits are lost forever (black-holed). So "NAND, SBOX, MBUS" cannot work. "SBOX, MBUS, NAND" should work, but it doesn't. "SBOX, NAND, MBUS" works. Perhaps there is a better solution than making a channel exclusive to a client. Do you have a suggestion? The NFC driver is queued for 4.10 6956e2385a16175ca350e199f9c760eb1644d5bf Regards. -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html