On Sat, May 21, 2016 at 10:09:49 +0200, Gary Jennejohn wrote:
> There appears to be a regression in AHCI/ADA behavior since r300207.
> Starting a test kernel at r300293 results in extremely long timeouts
> probing ahcich2 for non-existent multiplier ports.
> Here some kernel output:

Is this dmesg output with or without the problem?

> ahci0: <AMD SB7x0/SB8x0/SB9x0 AHCI SATA controller>
> port 0xff00-0xff07,0xfe00-0xfe03,0xfd00-0xfd07,0xfc00-0xfc03,
> 0xfb00-0xfb0f mem 0xfe02f000-0xfe02f3ff irq 22 at device 17.0 on pci0
> ahci0: AHCI v1.10 with 6 3Gbps ports, Port Multiplier supported

Has the controller always claimed support for Port Multipliers?

> ahcich2: <AHCI channel> at channel 2 on ahci0
> ada1 at ahcich2 bus 0 scbus2 target 0 lun 0
> /dev/ada1p1 on /home (ufs, local, journaled soft-updates)
> An older kernel at r299170 does not exhibit this peculiar behavior and
> mounts /home with no delays.

Are you able to send dmesg output before and after?

Kenneth Merry
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