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SATA error on booting dm8168,what's the reason?

Hello,Tier!

Sometimes when our dm8168 board boot up,there are some errors following;

sr 0:1:0:0: [sr1] Unhandled error code
sr 0:1:0:0: [sr1] Result: hostbyte=0x00 driverbyte=0x08
sr 0:1:0:0: [sr1] Sense Key : 0x3 [deferred]
sr 0:1:0:0: [sr1] ASC=0x11 ASCQ=0x5
sr 0:1:0:0: [sr1] CDB: cdb[0]=0x28: 28 00 00 0a 1c 80 00 00 02 00

Our SATA case is:

dm8168  sata---->jmb393--->HDD

                  sata--->sii3826---->BluRay Burner

                                       |--------->BluRay Burner

We use DVRRDK 3.0,and the sata driver of linux has been changed to rdk 4.0's.

expecting for any reply.