Some accelerated drivers may cause the machine to lockup when starting up the server on some versions of SVR4.0. The problem seems to be related to the kernel checking for the presence of physical memory when mmaping /dev/pmem. This can cause problems when mapping memory mapped registers. This was known to be a problem with the MGA driver in the SVGA server. Some other drivers may be affected too. The problem with the MGA driver is now fixed.
$XFree86: xc/programs/Xserver/hw/xfree86/doc/sgml/SVR4.sgml,v 18.104.22.168 1998/02/28 08:54:11 dawes Exp $ $XConsortium: SVR4.sgml /main/8 1996/10/27 11:06:06 kaleb $