On Thu, Nov 08, 2007 at 10:38:25PM -0500, mike zheng wrote: > I am working on an AHCI SATA controller. For each port, there is one > FIS descriptor and one Command List, which points to a Received FIS > structure and Command List structure. So what is Received FIS > structure? The Command List structure points to Command Table, that > has Command FIS field and Physical Region Descriptor table. I assume > the Command table is used for the communication between processor and > the SATA controller. Then why do we need the Received FIS structure? The driver actually doesn't need it at all, though a few ideas are floating around for using it. However, it's required by the hardware by definition -- you must provide a buffer for incoming FIS's (P0FB), before enabling FIS reception (P0CMD bit 4, FRE). If I had to guess, the hardware dumps the RX FIS into host memory rather than having additional internal buffers/FIFOs... Jeff - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
