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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.
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