On Tue, 9 Jun 2015, Kishon Vijay Abraham I wrote: > > But with a bounce buffer that's only 512 bytes long, you can never send > > an entire packet's worth of data. If the bounce buffer is 1024 bytes > > for control endpoint, 512 bytes should be sufficient to send entire packet right? Yes, you're right. I had confused control endpoints with bulk endpoints, where the maxpacket size is 1024. Sorry for the mistake. > > then you can send the entire first packet. When that's done, you can > > send the second packet. And so on. It wouldn't be quite as fast, but > > for ep0 that shouldn't matter. > > right! this is a variant of what I tried to implement in chained TRB [1]. > $subject tries just to avoid memory corruption instead of actually trying to > receive all the data. Okay. If you take the $SUBJECT approach, I think it would be better for an URB submission to fail than for the host controller to send only part of the data. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
