Consistent PHYRdyChg error on second mSATA (BIOS / HW problem ?)

I have just received two net6501-70 with identical configurations:

- net6501-70 Board and 1 Slot Standard Case
- Intel 30GB MLC mSATA SSD - SSDMCEAC030B3 (2 per box - for software RAID 1)
- lan1841, PCI Express Quad Gigabit ethernet board

While installing Linux x32 (3.15.1), during the initial software raid setup the second mSATA (scsi 1:0:0:0) drops out of raid after a few minutes of raid building. The behavior is 100% reproducible on both boxes. Furthermore, after encountering the error and soft-rebooting, the BIOS no longer sees the second mSATA drive (it does NOT appear in comBIOS device listing)- a hardware reboot (i.e. from button) or power cycle makes the disk available again.

The first mSATA (scsi 0:0:0:0) is stable.

The distro is Linux Gentoo i686 and I can reproduce it with both the supplied kernel or custom compiled. I can provide .config and any and all other information, or try anything you might suggest in order to further debug the issue.

Details below; please advise.

Thank you,
Dan


uname:

Linux speedy 3.15.1-net6501 #1 SMP PREEMPT Sat Jun 21 20:21:31 UTC 2014 i686 Genuine Intel(R) CPU @ 1.60GHz GenuineIntel GNU/Linux

dmesg error snippet:

Jun 21 21:49:58 speedy kernel: [ 2045.111438] ata2.00: exception Emask 0x10 SAct 0x18000 SErr 0x10300 action 0xe frozen
Jun 21 21:49:58 speedy kernel: [ 2045.111447] ata2.00: irq_stat 0x08400000, interface fatal error, PHY RDY changed
Jun 21 21:49:58 speedy kernel: [ 2045.111454] ata2: SError: { UnrecovData Persist PHYRdyChg }
Jun 21 21:49:58 speedy kernel: [ 2045.111462] ata2.00: failed command: WRITE FPDMA QUEUED
Jun 21 21:49:58 speedy kernel: [ 2045.111475] ata2.00: cmd 61/00:78:00:66:f4/04:00:00:00:00/40 tag 15 ncq 524288 out
Jun 21 21:49:58 speedy kernel: [ 2045.111475]          res 40/00:78:00:66:f4/00:00:00:00:00/40 Emask 0x10 (ATA bus error)
Jun 21 21:49:58 speedy kernel: [ 2045.111482] ata2.00: status: { DRDY }
Jun 21 21:49:58 speedy kernel: [ 2045.111488] ata2.00: failed command: WRITE FPDMA QUEUED
Jun 21 21:49:58 speedy kernel: [ 2045.111500] ata2.00: cmd 61/80:80:00:6a:f4/03:00:00:00:00/40 tag 16 ncq 458752 out
Jun 21 21:49:58 speedy kernel: [ 2045.111500]          res 40/00:78:00:66:f4/00:00:00:00:00/40 Emask 0x10 (ATA bus error)
Jun 21 21:49:58 speedy kernel: [ 2045.111507] ata2.00: status: { DRDY }
Jun 21 21:49:58 speedy kernel: [ 2045.111517] ata2: hard resetting link
Jun 21 21:49:59 speedy kernel: [ 2046.093300] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
Jun 21 21:49:59 speedy kernel: [ 2046.108273] ata2.00: configured for UDMA/133
Jun 21 21:49:59 speedy kernel: [ 2046.108319] ata2: EH complete
. . .
Jun 21 21:50:01 speedy kernel: [ 2048.015017] ata2: SATA link down (SStatus 0 SControl 300)
Jun 21 21:50:06 speedy kernel: [ 2053.014228] ata2: hard resetting link
Jun 21 21:50:06 speedy kernel: [ 2053.319216] ata2: SATA link down (SStatus 0 SControl 300)
Jun 21 21:50:06 speedy kernel: [ 2053.319239] ata2: limiting SATA link speed to 1.5 Gbps
Jun 21 21:50:11 speedy kernel: [ 2058.318433] ata2: hard resetting link
Jun 21 21:50:12 speedy kernel: [ 2058.623403] ata2: SATA link down (SStatus 0 SControl 310)
Jun 21 21:50:12 speedy kernel: [ 2058.623423] ata2.00: disabled
Jun 21 21:50:12 speedy kernel: [ 2058.623474] sd 1:0:0:0: [sdb]
Jun 21 21:50:12 speedy kernel: [ 2058.623479] Result: hostbyte=0x00 driverbyte=0x08
Jun 21 21:50:12 speedy kernel: [ 2058.623485] sd 1:0:0:0: [sdb]
Jun 21 21:50:12 speedy kernel: [ 2058.623488] Sense Key : 0xb [current] [descriptor]
Jun 21 21:50:12 speedy kernel: [ 2058.623495] Descriptor sense data with sense descriptors (in hex):
Jun 21 21:50:12 speedy kernel: [ 2058.623499]         72 0b 00 00 00 00 00 0c 00 0a 80 00 00 00 00 00
Jun 21 21:50:12 speedy kernel: [ 2058.623518]         00 f5 c2 80
Jun 21 21:50:12 speedy kernel: [ 2058.623527] sd 1:0:0:0: [sdb]
Jun 21 21:50:12 speedy kernel: [ 2058.623531] ASC=0x0 ASCQ=0x0
Jun 21 21:50:12 speedy kernel: [ 2058.623536] sd 1:0:0:0: [sdb] CDB:
Jun 21 21:50:12 speedy kernel: [ 2058.623540] cdb[0]=0x2a: 2a 00 00 f5 c2 80 00 04 00 00
Jun 21 21:50:12 speedy kernel: [ 2058.623556] end_request: I/O error, dev sdb, sector 16106112
Jun 21 21:50:12 speedy kernel: [ 2058.623622] sd 1:0:0:0: rejecting I/O to offline device
Jun 21 21:50:12 speedy kernel: [ 2058.623630] sd 1:0:0:0: [sdb] killing request
Jun 21 21:50:12 speedy kernel: [ 2058.623645] sd 1:0:0:0: rejecting I/O to offline device
Jun 21 21:50:12 speedy kernel: [ 2058.623694] sd 1:0:0:0: [sdb]
Jun 21 21:50:12 speedy kernel: [ 2058.623699] Result: hostbyte=0x00 driverbyte=0x08
Jun 21 21:50:12 speedy kernel: [ 2058.623704] sd 1:0:0:0: [sdb]
. . .
Jun 21 21:50:12 speedy kernel: [ 2058.623978] end_request: I/O error, dev sdb, sector 16108160
Jun 21 21:50:12 speedy kernel: [ 2058.624011] ata2.00: detaching (SCSI 1:0:0:0)
Jun 21 21:50:12 speedy kernel: [ 2058.631674] sd 1:0:0:0: [sdb] Synchronizing SCSI cache
Jun 21 21:50:12 speedy kernel: [ 2058.631818] sd 1:0:0:0: [sdb]
Jun 21 21:50:12 speedy kernel: [ 2058.631827] Result: hostbyte=0x04 driverbyte=0x00
Jun 21 21:50:12 speedy kernel: [ 2058.631835] sd 1:0:0:0: [sdb] Stopping disk
Jun 21 21:50:12 speedy kernel: [ 2058.631875] sd 1:0:0:0: [sdb] START_STOP FAILED
Jun 21 21:50:12 speedy kernel: [ 2058.631885] sd 1:0:0:0: [sdb]
Jun 21 21:50:12 speedy kernel: [ 2058.631891] Result: hostbyte=0x04 driverbyte=0x00

dmesg boot snippet:

Jun 21 21:07:36 speedy kernel: [    4.260721] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
Jun 21 21:07:36 speedy kernel: [    4.271704] ata2.00: ATA-9: INTEL SSDMCEAC030B3, LLLi, max UDMA/133
Jun 21 21:07:36 speedy kernel: [    4.271704] ata2.00: 58626288 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
Jun 21 21:07:36 speedy kernel: [    4.281700] ata2.00: configured for UDMA/133
Jun 21 21:07:36 speedy kernel: [    4.281927] scsi 1:0:0:0: Direct-Access     ATA      INTEL SSDMCEAC03 LLLi PQ: 0 ANSI: 5
Jun 21 21:07:36 speedy kernel: [    4.283428] sd 1:0:0:0: [sdb] 58626288 512-byte logical blocks: (30.0 GB/27.9 GiB)
Jun 21 21:07:36 speedy kernel: [    4.283701] sd 1:0:0:0: [sdb] Write Protect is off
Jun 21 21:07:36 speedy kernel: [    4.283707] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
Jun 21 21:07:36 speedy kernel: [    4.283790] sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Jun 21 21:07:36 speedy kernel: [    4.284545] sd 1:0:0:0: Attached scsi generic sg1 type 0
Jun 21 21:07:36 speedy kernel: [    4.284692]  sdb: unknown partition table
Jun 21 21:07:36 speedy kernel: [    4.285311] sd 1:0:0:0: [sdb] Attached SCSI disk