> > USB is only the transport. It doesn't add or remove functionality (the > only exception being probing for LUNs on CBI devices). If you want to > determine the geometry you will have to do this through SCSI commands. I > was hoping that the CAM code would be smart enough to request the > details from the drive itself, but perhaps there is a good reason for > asking the controller for this. > > It did work without, so it hasn't been implemented yet. Feel free to > suggest a SCSI command together with the logic. > > What is the GET_GEOMETRY used for anyway?
Well the short version of the problem is that "fdisk -BI <disk>" works on -stable to get a FreeBSD partition on the Compact Flash. This does not work on -current anymore. I have traced that back to the commit in umass.c rev 1.61 that removed the fake geometry setting and just leave the cylinders, heads and sectors_per_track zero. This cause fdisk to coredump with a floating point error. > > In message: <[EMAIL PROTECTED]> > > Poul-Henning Kamp <[EMAIL PROTECTED]> writes: > > : We should obviously fix it. I have no idea what is possible in USB > > : devices in this respect. > > > > Nor do I. Maybe there's some SCSI command that we can send that is > > well defined enough to work often enough. > > > > However, I'm not clueful enough about SCSI to know if this can be done > > (likely reading some mode page will do it in real SCSI), nor about > > USB's mass storage devices, nor about all the wonderful and weird > > variations that one might find in the wild... John -- John Hay -- [EMAIL PROTECTED] / [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
