On Sat, Jan 05, 2008 at 01:02:30AM +0000, Stuart Brady wrote: > On Fri, Jan 04, 2008 at 06:25:25PM -0600, Rob Landley wrote: > > On Friday 04 January 2008 04:02:07 Carlo Marcelo Arenas Belon wrote: > > > > > > - buf[7] = total_sectors <= 1433600 ? 0x08 : 0x10; /* current > > > > profile */ > > > > Where does the constant come from, anyway? > > 1433600? Seems it's the number of 512 KiB blocks in a 700 MiB CD image > (700 * 1024 * 2).
yes, that magic constant corresponds to the maximum expected size for a CD-ROM and is used to detect if the profile used should be for DVD-ROM or not. It came from the original implementation patch for "GET CONFIGURATION" committed in revision 1.66 of ide.c by Filip Navarra as "Partial IDE DVD emulation" http://cvs.savannah.nongnu.org/viewvc/qemu/hw/ide.c?root=qemu&r1=1.65&r2=1.66 Carlo
