Zenith432, today I tested GenericUSBXHCI.kext 1.2.6 with new ASMedia ASM1042 ExpressCard on MacBook Pro 17 OS X 10.8.5.
There is some advantages and bugs between It and Renesas upd720202 one.
Strange bug is: I use ASM1051E UAS enclosure with NTFS-formatted drive inside for test. Also, I have Paragon NTFS 10.1 driver installed (and can write to NTFS volumes).
It works with both cards, but on USB 2.0 port or on USB 3.0 port on NEC ExpressCard no issues for now.
If I connect this to ASM1042 ExpressCard, there is error in syslog and drive mounted readonly (uses Apple ro NTFS driver). So looks like it's GenericUSBXHCI + ASM1042 isssue (It have no error with NEC card).
Under spoiler log with HDD attached to a) ASM1042 and B) NEC upd720202 USB 3.0 port:
Another issue with ASM1042 it works only if ExpressCard installed on boot / once. If I unmount card from task bar and replug it, there is no card detection (and icon in task bar) so it doesn't work.
It also doesn't detected if card inserted on live system. And it works fine after sleep, if card was installed on boot (so detected). Probably, it's as media firmware issue?
It's not the same with Nec upd720202 card, which always detected on the fly.
The good thing is ASM1042 ExpressCard works fine with another USB 3.0 drive (I mention it in my previous post) when there is external power attached. Nec ExpressCard always stalled with it.
P.S. Firmware on ASM1042 was updated to last possible which I find on the net: xHCI_v120816_02_02_6D.bin
Also, there is new bug and kernel panic, I can't even boot laptop with GenericUSBXHCI 1.2.7d7 installed and Nec or ASM1042 + UASP drive attached. All OK with last 1.2.6 thou.
ASM1042 just disappears from system if I connect the UAS drive to it on live system and working card (without KP). Nec card give me KP with the same situation (works fine with Thumb Drive, KP immediately on UAS drive insert).
p.p.s. The speed on GenericXHCI 1.2.6 + Nec + UAS + SSD on MacBook Pro 2011 is amazing ;-)