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SATA failure messages

I am seeing the following sata messages during boot-up of a DM8168. Why does the sata port not link at 3Gbps all the time? This drive has been testing on a windows PC and it links everytime at 3Gbps. We are seeing this problem intermittently with several different sata devices. During boot, sometimes a device will link at 3Gps, sometimes it will link at 1.5Gbps.

ata2: softreset failed (device not ready)

ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)

ata2: link online but 1 devices misclassified, retrying

ata2: softreset failed (device not ready)

ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)

ata2: link online but 1 devices misclassified, retrying

ata2: link is slow to respond, please be patient (ready=0)

ata2: softreset failed (device not ready)

ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)

ata2: link online but 1 devices misclassified, retrying

ata2: limiting SATA link speed to 1.5 Gbps

ata2: softreset failed (device not ready)

ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310)

ata2.00: ATA-8: KINGSTON SVP100S264G, CJRA0202, max UDMA/100

ata2.00: 125045424 sectors, multi 16: LBA48

ata2.00: configured for UDMA/100

scsi 1:0:0:0: Direct-Access ATA KINGSTON SVP100S CJRA PQ: 0 ANSI: 5

sd 1:0:0:0: Attached scsi generic sg0 type 0

sd 1:0:0:0: [sda] 125045424 512-byte logical blocks: (64.0 GB/59.6 GiB)

sd 1:0:0:0: [sda] Write Protect is off

sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

sda: unknown partition table

sd 1:0:0:0: [sda] Attached SCSI disk