DM8168 evm板子，使用sata的1,2口，并没有使用扩展口。连接硬盘。报错如下LOG：
scsi0 : ahci_platform
scsi1 : ahci_platform
ata1: SATA max UDMA/133 mmio [mem 0x4a140000-0x4a150fff] port 0x100 irq 16
ata2: SATA max UDMA/133 irq_stat 0x00400040, connection status changed irq 16
PHY: 0:01 - Link is Up - 100/Full
ata1: SATA link down (SStatus 0 SControl 300)
ata2: softreset failed (1st FIS failed)
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)
ata2.00: qc timeout (cmd 0xec)
ata2.00: failed to IDENTIFY (I/O error, err_mask=0x4)
ata2: softreset failed (1st FIS failed)
ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata2: link online but 1 devices misclassified, retrying
ata2: softreset failed (1st FIS failed)
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)
ata2.00: qc timeout (cmd 0xec)
ata2.00: failed to IDENTIFY (I/O error, err_mask=0x4)
ata2: limiting SATA link speed to 1.5 Gbps
ata2: link is slow to respond, please be patient (ready=0)
ata2: softreset failed (device not ready)
ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
ata2.00: qc timeout (cmd 0xec)
ata2.00: failed to IDENTIFY (I/O error, err_mask=0x4)
ata2: softreset failed (1st FIS failed)
ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
ata2: link online but 1 devices misclassified, retrying
ata2: softreset failed (1st FIS failed)
ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
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 1.5 Gbps (SStatus 113 SControl 310)
请问有经验的朋友或者管理员，这是什么原因？
