The Plextor M6e PCI-E SSD is a relatively new device, but it uses the Marvell 88SS9183 controller. This controller was added in revision 254987 to support the 2013 Macbook Air.
After a camcontrol rescan all I get this error:
(aprobe0:ahcich0:0:0:0): Unexpected signature 0xffff
pciconf for the Plextor M6e:
ahci0@pci0:4:0:0: class=0x010601 card=0x91831b4b chip=0x01221c28 rev=0x14 hdr=0x00
class = mass storage
subclass = SATA
bar  = type I/O Port, range 32, base rxc050, size 8, enabled
bar  = type I/O Port, range 32, base rxc040, size 4, enabled
bar  = type I/O Port, range 32, base rxc030, size 8, enabled
bar [1c] = type I/O Port, range 32, base rxc020, size 4, enabled
bar  = type I/O Port, range 32, base rxc000, size 32, enabled
bar  = type Memory, range 32, base rxdf120000, size 512, enabled
cap 01 = powerspec 3 supports D0 D3 current D0
cap 05 = MSI supports 1 message enabled with 1 message
cap 10 = PCI-Express 2 legacy endpoint max data 256(512) link x2(x2)
speed 5.0(5.0) ASPM disabled(L0s/L1)
ecap 0001 = AER 1 0 fatal 0 non-fatal 0 corrected
Same problem here with this drive. Tried with latest current and 9.3, both same result.
MemoRight use the same Marvell controller and I am experiencing the same problem with our PCIe switch card.
FreeBSD freenas.local 9.2-RELEASE-p10 FreeBSD 9.2-RELEASE-p10 #0 r262572+4fb5adc: Wed Aug 6 17:07:16 PDT 2014 firstname.lastname@example.org:/fusion/jkh/921/freenas/os-base/amd64/fusion/jkh/921/freenas/FreeBSD/src/sys/FREENAS.amd64 amd64
should we be getting ahci driver fix? These SSDs both from Plextor and Memoright work transparently with no any additioanl touches in VMware, Mac OS X, Windows 7,8 and server 2008 and 2012, Linux.
Some thing is off with the AHCI driver in FreeBSD - no additional patches should be needed to support a standard device?
Not all controllers implement AHCI equally. Marvell is slightly different in few places. Patch to better support random Marvell AHCI controllers was committed couple weeks ago.
FreeNAS 126.96.36.199 that should be released soon should include this change.