AHCI with Port Multiplier Support


what is the current status of AHCI port multiplier support? Has anyone a link or some information you can point me to?

I too would like to know more on the status of port multipliers. notebook arrays are getting more and more interesting for low power @home storage solutions. port multiplier support is almost a must in these setups.
It should work fine on 8-STABLE or 9-CURRENT with ahci, siis or mvs drivers. Note that AHCI controllers could be very different. Not every of them support port multipliers and even less support FIS-based switching to make concurrent disk access effective.