> 3) It is critical to ensure that the ATA "ctl" register is never
> written to when no drive is attached.  This means bracketing the SRST
> sequence to first do a PCS detection before permitting the SRST.
> If "ctl" is accessed with no drive attached, the machine locks up hard.

At least for PATA you probably need to disable IORDY handshaking before
the reset and probe.

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