On 07/25/2013 06:51 PM, Aaron Lu wrote: > On 07/26/2013 07:15 AM, Dave Hansen wrote: >> > I've got a relatively new system that doesn't seem to be able to hotplug >> > SATA disks. I see the same behavior on 3.10, 3.11-rc2, and Ubuntu's >> > 3.8.0-25-generic. The disks are detected right away on reboots, but >> > even after poking the /sys/class/scsi_host/host*/scan files, new disks >> > are never detected. I've disabled link power management. >> > >> > Am I doing something stupid here? I thought this "just worked" on my >> > previous hardware. > My vague memory reminds me that not all SATA ports are hot pluggable - > you can check the port's "External SATA port" bit and "Hot Plug Capable" > bit of the PxCMD register like this: > > $ grep ahci /proc/iomem > e1a40000-e1a407ff : ahci > # dd if=/dev/mem of=ahcidump bs=4096 count=1 skip=0xe1a40 > You will need to change 0xe1a40 to decimal format. > > Then the PxCMD is at offset 0x118 for port 0, check bit 21 for E-SATA or > bit 18 for hot pluggable bits. If any of them set to 1, this port > should be hot pluggable; otherwise, it doesn't have this capability. <sigh> I went digging back through the BIOS settings, and found a nice checkbox to enable hotplug support on the ports. All seems happy now. Thanks for the help. I hope someone else googling will hit this thread. :) -- 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
