> -----Original Message----- > From: Tejun Heo [mailto:htejun@xxxxxxxxx] On Behalf Of tj@xxxxxxxxxx > Sent: Friday, July 22, 2011 2:51 AM > To: Derry Bryson > Cc: linux-ide@xxxxxxxxxxxxxxx > Subject: Re: Problem w/ hotplug on sata_sil24 w/ PMP (sil3726) > > Hello, > > On Thu, Jul 21, 2011 at 04:22:07PM +0000, Derry Bryson wrote: > > Here are the specs on the port multiplier board: > > > > Lycom ST-126RM (http://www.lycom.com.tw/) > > Sil3726 chip revision 17 > > EEPROM FW Version: 1.0114 > > > > Also there is another problem: ports that are not connected at power > on > > are ignored until a port that was connected at power on is > hotplugged. So, > > for instance, if I turn the unit on with only a drive on the first > port, the > > other four ports will not work and I don't even see kernel messages > when > > hotplugging until I hotplug the first port. I haven't looked into > this yet, > > but it would seem the driver must be disabling the ports and they are > not > > looked at again until the hard reset is performed. > > That's most likely the sil pmp itself. It has been known to show > erratic behavior if the first port is not occupied during power up. I > don't know whether later firmware updates fixed that tho. Can you get > hold of a marvell PMP and see how it behaves? > That may well be a problem, but is not the problem in this case since it is not limited to port 0. Seems like the sil driver or pmp code in the kernel is disabling the ports that are not connected at pmp power on and not looking at them again until we hotplug one of the ports that was connected and cause a hard reset or something like that. For instance, I turn off the pmp unit and connect drives to ports 0, 1, and 2 then power on the unit. Linux sees the pmp unit and finds the three drives. Then I connect a drive to port 3 and Linux reports nothing. No interrupts, no nothing. Same with port 4. However if I connect a drive to port 3 or 4 (or both) and hotplug the a drive on any of ports 0, 1, or 2 now the drives are detected after the hard reset. This hardware works fine under Windows, hotplugging drives and powering the unit off and on, etc. using the same Sil3124 eSATA PCI controller. No problems, so I think the hardware is okay. I don't know of nor have a Marvell PMP, but I do have another Sil3726 PMP board with newer firmware and a board with a JMicron PMP that I am going to test with. Thanks for your help. Derry Bryson Sr. Software Engineer Highly Reliable Systems www.High-Rely.com "Making Backup Invisible" Phone: 775.329.5139 X129 Fax: 775.370.1001 Sales & Support: 877.384.6838 This e-mail and any files transmitted with it are the property of Highly Reliable Systems, Inc. This (email) information is confidential, and is intended solely for the use of the individual or entity to whom this e-mail is addressed. If you are not one of the named recipient(s) or otherwise have reason to believe that you have received this message in error, please notify the sender and delete this message immediately from your computer. Any other use, disclosure, retention, dissemination, forwarding, printing, distribution or copying of this e-mail is strictly prohibited. -- 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
