Kevin/Paolo, Our concern was that actual rotating media (e.g. USB-to-SATA adapter) may have problems without the cdb_mode_sense_geom(). I hope to have my hands on one tomorrow to do some testing.
Dave ----- Original Message ----- > From: "Kevin O'Connor" <[email protected]> > To: "Dave Frodin" <[email protected]>, "Paolo Bonzini" > <[email protected]> > Cc: [email protected] > Sent: Sunday, March 4, 2012 11:49:30 AM > Subject: Re: [SeaBIOS] Booting from USB thumbdrives, older drives boot, newer > drives don't. > > On Fri, Mar 02, 2012 at 03:10:33PM -0700, Dave Frodin wrote: > > Here are my latest results. > > The sg_modes command has a "-a" option to dump out all of the > > supported page codes > > - it reports that none of the thumbdrives (tested 9) support > > page code = 4 > > - it reports that most of the thumbdrives (tested 9) support > > page code = 5 > > - it commented that page code 5 is obsolete > > Thanks Dave. I appreciate your detailed analysis. > > The call to cdb_mode_sense_geom() was only recently added. I'm > inclined to just remove the call. Paolo, is there a use case where > having the "physical" chs info is important? SeaBIOS should generate > good "virtual" chs info regardless, and the underlying "physical" > info > is only exported in a couple of places. > > > Marc suggested that I leave the page_code set to 4 in order to > > preserve functionality for drives that actually report valid CHS > > geometry, and to add code that would clear the stall from the USB > > controller and thumbdrive. > > The SeaBIOS code really should know how to clear a stall. However, > it's a bit of a pain to do that in the general case. (In the general > case, we'd need to support clearing the stall from 16bit mode, which > would require the ability to send control messages to the drive in > 16bit mode.) > > > 2) Is there any way to differentiate between a USB thumbdrive and > > a USB-to-SATA adapter? > > I don't know of a way to detect it, but I haven't looked closely. > > -Kevin > _______________________________________________ SeaBIOS mailing list [email protected] http://www.seabios.org/mailman/listinfo/seabios
