Tejun Heo wrote:
.. Then, PACKET_IDENTIFY after configuring transfer mode fails with -ENOENT. Meaning it saw (status & (ATA_BUSY|ATA_DRQ|ATA_ERR|ATA_DF)) == 0 in HSM_ST.
..
So, PATA gurus, can you bless us with enlightenment? :-)
Heh.. guaranteeing detection of all the strange implementations out there is part black magic. But the simple thing to do here is, just for fun, hack the code to do the infamous 50 millisecond hard wait before issuing the PACKET_IDENTIFY. If that fixes it, then it's just a matter of tuning to discover the real amount of delay required, and a nicer way of doing the delay. Also, zero out the features register before issuing PACKET_IDENTIFY, if the code isn't already doing that. After the drive asserts BUSY, and later deasserts BUSY, there might be a slight delay before the drive asserts DRQ. So, it is possible for the status to read zeros in the important bits. My suggestion is to wait up to the infamous 50 milliseconds again here, if needed. ???? Cheers -- Mark Lord Real-Time Remedies Inc. mlord@xxxxxxxxx - 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
