Device hot-swap with ahcisata(4)

[River Tarnell <r.tarnell%IEEE.ORG@localhost>]

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Is it possible to hot-swap devices connected via ahcisata(4)?  After 
inserting a disk and running "atactl atabus1 reset", the device is 
detected:

ahcisata0 port 1: device present, speed: 3.0Gb/s

... but no 'wd' device attaches, so it isn't visible.

The controller is:

ahcisata0 at pci0 dev 17 function 0: ATI Technologies SB700/SB800 SATA 
Controller (AHCI mode)
ahcisata0: interrupting at ioapic0 pin 19
ahcisata0: AHCI revision 1.2, 4 ports, 32 command slots, features 
0xf722e000

I've previously used this with FreeBSD, and hot-swap works.

Thanks,
River.
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