Hi, I found that if I enabled CONFIG_SATA_PMP while not using multiplier and connect the disks directly to the board, the disk cannot be found due to software reset always failed. With arm/cns3xxx linux-2.6.37-rc3 ahci-platform driver # modprobe ahci-platform [ 12.790000] ahci ahci.0: forcing PORTS_IMPL to 0x3 [ 12.800000] ahci ahci.0: AHCI 0001.0100 32 slots 2 ports 3 Gbps 0x3 impl platform mode [ 12.810000] ahci ahci.0: flags: ncq sntf pm led clo only pmp pio slum part ccc [ 12.850000] scsi0 : ahci_platform [ 12.860000] scsi1 : ahci_platform [ 12.870000] ata1: SATA max UDMA/133 irq_stat 0x00400040, connection status changed irq 65 [ 12.880000] ata2: SATA max UDMA/133 mmio [mem 0x83000000-0x83ffffff] port 0x180 irq 65 [ 13.240000] ata2: SATA link down (SStatus 0 SControl 300) [ 18.900000] ata1: link is slow to respond, please be patient (ready=0) [ 22.930000] ata1: softreset failed (device not ready) [ 28.940000] ata1: link is slow to respond, please be patient (ready=0) [ 32.970000] ata1: softreset failed (device not ready) [ 38.980000] ata1: link is slow to respond, please be patient (ready=0) [ 68.030000] ata1: softreset failed (device not ready) [ 68.040000] ata1: limiting SATA link speed to 1.5 Gbps [ 70.280000] ata1: SATA link down (SStatus 1 SControl 310) With some debug, ahci_check_ready always get PORT_TFDATA(20)=0x1d0 While using multiplier with CONFIG_SATA_PMP enabled, or using disks directly without CONFIG_SATA_PMP have no issue. After some googling, it seems common and the only fix is to disable CONFIG_SATA_PMP. So, before I keep on going, I would like to know whether this is a limitation, or a bug? Best Regards, Mac Lin -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
