Add debugfactotum, *norealmode, *noe820scan
 [rsc] --rw-rw-r-- M 451989 glenda sys 22077 Nov  6 11:29 sys/man/8/plan9.ini
	/n/sourcesdump/2005/1106/plan9/sys/man/8/plan9.ini:515,520 - 
	/n/sourcesdump/2005/1107/plan9/sys/man/8/plan9.ini:515,526
	  See
	  .IR boot (8)
	  for more.
	+ .SS \fLdebugfactotum=\fP
	+ Causes
	+ .IR boot (8)
	+ to start factotum with the
	+ .B -p
	+ flag, so that it can be debugged.
	  .SS \fLventi=value\fP
	  When booting from a local fossil server backed by a local
	  or remote venti server,
	/n/sourcesdump/2005/1106/plan9/sys/man/8/plan9.ini:551,556 - 
	/n/sourcesdump/2005/1107/plan9/sys/man/8/plan9.ini:557,569
	  consults only the first table,
	  .B old
	  only the second.
	+ .SS \fL*norealmode=\fP
	+ The kernel switches the processor to 16-bit real mode 
	+ to run BIOS interrupts, for example to find the memory map or to enable VESA. 
	+ This variable disables such switches.
	+ .SS \fL*noe820scan=\fP
	+ When available, the kernel uses the BIOS E820 memory map
	+ to size memory.  This variable disables the scan.
	  .SS \fL*maxmem=value\fP
	  This defines the maximum physical address that the system will scan when sizing memory.
	  By default the operating system will scan up to 768 megabytes, but setting
	/n/sourcesdump/2005/1106/plan9/sys/man/8/plan9.ini:561,566 - 
	/n/sourcesdump/2005/1107/plan9/sys/man/8/plan9.ini:574,580
	  for the kernel to find it.
	  .B *maxmem
	  must be less than 1.75 gigabytes.
	+ This variable is not consulted if using the E820 memory map.
	  .SS \fL*kernelpercent=value\fP
	  This defines what percentage of available memory is reserved for the kernel allocation pool.
	  The remainder is left for user processes.  The default