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+$NetBSD: Options,v 1.3 1994/10/26 07:22:52 cgd Exp $
+
+Here is a list of hp300 specific kernel compilation options and what they
+mean:
+
+HAVEVAC
+	Compiles in support for virtually addressed cache (VAC) found on
+	hp320 and 350 machines.  Should only be defined when HP320 and/or
+	HP350 is.
+
+HP320
+	Support for old hp320 machines: 16mhz 68020, HP MMU, 16mhz 68881
+	and VAC.  Compiles in support for a VAC, HP MMU, and the 98620A
+	16-bit DMA channel.  Forces the definition of HAVEVAC.
+
+HP350
+	Support for old hp350 machines: 25mhz 68020, HP MMU, 20mhz 68881
+	and VAC.  Compiles in support for a VAC and the HP MMU.  Differs
+	from HP320 in that it has no support for 16-bit DMA controller.
+	Forces the definition of HAVEVAC.
+
+HP330
+	Support for old hp330 (and 318/319) machines: 16mhz 68020, 68551 PMMU
+	and 16mhz 68881.  Compiles in support for PMMU.
+
+HP360
+	Support for old hp360 (and 340) machines: 25mhz 68030+MMU and 25mhz
+	68882.  Compiles in support for PMMU and 68030.  Differs from HP330
+	in support for 68030 on-chip data cache.
+
+HP370
+	Support for old hp370 (and current 345/375/400) machines: 33 (50) mhz
+	68030+MMU and 33 (50) mhz 68882.  Compiles in support for PMMU, 68030
+	and off-chip physically addressed cache.  Differs from 360 in only one
+	place, in dealing with flushing the external cache.
+
+HP380
+	Support for "current" hp380/425 (and 433) machines: 25 (33) mhz 68040
+	with MMU/FPU.  Compiles in support for 68040.
+
+FPSP
+	Compiles in support to link with Motorola's 68040 FP emulation
+	library.  Kernel will build and run without this option, but many
+	binaries will core dump.  Should not be defined unless HP380 is.
+
+
+USELEDS
+	Twinkle the hp4xx front panel (or hp3xx internal) LEDs in the HP
+	designated way.  Somewhat frivolous, but the heartbeat LED is
+	useful to see if your machine is alive.
+
+PANICBUTTON
+	Compiles in code which will enable a "force-crash" HIL keyboard
+	sequence.  When the Reset key is typed twice in succession (within
+	half a second) the kernel will panic.  Note that the HIL Reset key
+	sends a NMI to the processor which will get the CPUs attention no
+	matter what it is doing (i.e. as long as it isn't halted).  Alas,
+	also note that the NMI is only sent when the keyboard is in "cooked"
+	(ITE) mode.  If it is in "raw" mode (i.e. X-server is running) the
+	Reset key is just another keypress event.  A cheezy substitute in
+	this case is holding down the upper right-most unlabeled key and
+	then pressing the unlabeled key to its left.  Note that this only
+	works if HIL (level 1) interrupts are not masked.
+
+DEBUG
+	Compiles in a variety of consistency checks and debug printfs
+	throughout the hp300 MD code and device drivers.
+
+COMPAT_HPUX
+	Enables HP-UX binary compatibility mode.  Allows a variety of
+	"recent" HP-UX binaries to be run unchanged.  Due to the
+	evolutionary and "as-needed" nature of this code, "recent" is
+	anywhere from release 6.2 to 8.0 of HP-UX.  It will run 8.0
+	shared-library binaries (assuming all the necessary shared-libraries
+	are installed in the filesystem).
+
+COMPAT_OHPUX
+	Compile in old 4.2-ish HP-UX (pre-6.0?) compatibility code.
+
+FPCOPROC
+	Compile in code to support the 68881 and above FPU.  Should always
+	be defined, since all supported SPUs have one.  Don't even know if
+	it will compile, much less work,  without this option.  Defined in
+	the prototype makefile (hp300/conf/Makefile.hp300).
+
+DCMSTATS
+	Compile in code to collect a variety of transmit/receive statistics
+	for the 98642 4-port MUX.
+
+WAITHIST
+	Compile in code to collect statistics about the distribution of
+	wait-times for various busy waits in the SCSI host-adaptor driver.
+
+STACKCHECK
+	Enables two types of kernel stack checking in hp300/hp300/locore.s:
+	1. stack "overflow".  On every clock interrupt we ensure that
+	   the current kernel stack has not grown into the user struct
+	   page, i.e. size exceeded UPAGES-1 pages.
+	2. stack "underflow".  Before every rte to user mode we ensure
+	   that we will be exactly at the base of the stack after the
+	   exception frame has been popped.
+	This option can degrade performance considerably, use it only if
+	you suspect a problem with kernel stacks.
+
+SCSI_REVPRI
+	Changes autoconf to start matching logical SCSI devices starting
+	at slave 6 and working backwards instead of starting at slave 0
+	and working up.  Later releases of the HP boot ROM search for
+	boot devices in this manner.  This is apparently the order in
+	which priority is given to slaves on the host adaptor.  Define
+	this if you use wildcarding and want to stay in sync with the
+	boot ROM's strategy.
+
+MAPPEDCOPY
+	Use page remapping to do large copyin/copyouts.  When defined
+	the default is to use mapped copy for operations on one page
+	or more except on machines with virtually-indexed caches.
+	See initcpu() in machdep.c
+
+BUFFERS_UNMANAGED
+	Set up the buffer cache "below" the machine independent VM.
+	Normally, in startup() we use vm_map operations to initially
+	assign physical memory to the buffers.  This creates a map with
+	a huge number of map entries (twice the number of buffers)
+	which serve no purpose since remaining buffer operations
+	(i.e. pagemove) work below the MI layer anyway.  Defining this
+	symbol will cause startup() to use pmap operations to map the
+	initial pages leaving the buffer_map one big entry.