eb89b33d39afea54862aee9986783a7f20463c8b
- do not start a port before the BSY and DRQ flags have been cleared; as such, poll on device status rather than signature availability. - change "ahci_sig_timeout" to "ahci_device_timeout" variable setting accordingly; this variable determines the polling duration before a newly attached device is given up on, and uses 30 seconds as default; - use port connect changes (PCS/X/DET->1h) to kick off polling for an attached device; detachment is still detected by means of PhyRdy status changes (PRCS/N/DET<->3h).
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