On Tuesday 02 December 2008 04:48:21 pm Luigi Rizzo wrote: > On Tue, Dec 02, 2008 at 02:24:58PM -0500, John Baldwin wrote: > > On Tuesday 02 December 2008 09:57:48 am Luigi Rizzo wrote: > ... > > > + a drive number of 0x00 (floppy, or USB in floppy emulation) is > > > now accepted as valid. Previously, it was overridden with 0x80, > > > meaning that the partition table coming from the media was > > > used to access sectors on a possibly different media. > > > You can revert to the previous mode building with -DCHECK_DRIVE, > > > and you can always use the 'setdrv' option in boot0cfg > > > > I would flip this back to the original default. This was there to workaround > > certain broken BIOSes that incorrectly specified a drive of 0x00 when you > > booted from the hard drive (at least according to the comments). On such > > i don't have strong opinions on this, but i would really like to see some > evidence on how relevant the original logic (and the comments in the > code on broken BIOSes) are nowadays. That code dates back to 1998. > > On the contrary, I can point to a very current and widespread case with > AMI Bioses which, in the "Auto" emulation mode for USB device, use %dl=0 > for devices under 500MB or so; in this case the original boot0 did > the wrong thing, because overriding with 0x80 causes reading from the > wrong device. > > Granted, boot0cfg options can fix things for both cases. It's all a > matter of what is the most reasonable default.
Agreed. I'm just very hesitant about changing the defaults of boot0 (or any of the boot code for that matter). -- John Baldwin _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"
