vax/boot: fix detection of CMD CQD-22x MSCP controllers

Certain models of CMD MSCP controllers fail to be detected by uda(4) if
they have been booted from. This failure mode has been introduced in
revision 1.11 of uba_mainbus.c, when scanning for Qbus/Unibus memories
was added. They are deteced fine when NetBSD is booted from any other
device such as over the network.

When NetBSD is booted from a MSCP controller, the boot loader sets up
the Qbus map to provide the controller with a small command/response
ring in memory to be used for I/O. Once the kernel is loaded and uba(4)
is attaching, the Qbus map is cleared while scanning for memories. It
appears that sudden loss of access to the command/response ring causes
the firmware of these CMD controllers to drop dead.

As a result, these controllers don't react in a reasonable time (100ms
by the spec) when their IP register is written to re-initialze the
controller. Even though uda(4)'s udamatch() waits up to 10s for a sign
of life from the controller, that's usually not enough for it to wake
up and it is assumed to be absent. Which, of course, causes the kernel
to fail booting as the boot device can't be found.

This needs to be addressed both in the kernel and the bootloader.

To fix this properly, the standalone ra.c driver in the boot loader
should provide a close() entry point which clears the IP register to
issue a controller reset. Thus when the kernel is loaded, the firmware
of the MSCP controller is again in reset state and can't get confused
anymore by the initialization of the Qbus map in uba(4).

branches: 1.22.38;
Fix bug causing autoboot on 750/780 not to work. Cleanup.

Use a common routine ubmap() that setup the map registers as needed,
not expecting everything to be below 4M. This solves the problem
that large kernels cannot be loaded reported on port-vax.

branches: 1.20.2; 1.20.8;
Update copyright notice for Ludd (remove clause 3 & 4).

branches: 1.19.6;
fix unused variable warnings

branches: 1.18.12; 1.18.22; 1.18.26;
bzero -> memset

branches: 1.17.62; 1.17.70; 1.17.76;
fix pointer signedness and build with GCC4.

branches: 1.16.2;
Correct a mistake I introduced when getting rid of lvalue casts.

Get rid of lvalue casts by either using an extra temporary variable
or by using the appropriate casts in the first place.

branches: 1.14.4; 1.14.8; 1.14.14;
merge ktrace-lwp.

branches: 1.13.2;
Use the form of #include <...> rather than #include "..." for headers of
which paths don't start from the current directory.

Remove trailing spaces.

branches: 1.11.6;
Need longer delay while waiting for mscp packets, otherwise it times out
on VAX8650.

%d -> %ld in some debug messages, after the ELF switch.

branches: 1.9.4; 1.9.8; 1.9.16;
Add support for loading a 2nd stage boot in either a.out or ELF.
Add support for loading a 2nd stage boot directly to it's desired address
if possible.
cleanup use of u_int/size_t.

Add support for VAX 6000 + VAX 8000. Tweak console routines.
Create a fake RPB if either netbooted (on machine without RPB) or
loaded from console storage (without VMB intervention).

Fix booting from BI-based disks.

branches: 1.6.2;
Remove forgotten debug printf.

Change all devices to use the RPB info when autobooting, this allows for
booting from unsupported devices also. As a side effect; it fixes PR#9202.

branches: 1.4.2;
BI bus files has moved.

Search for include files in new locations.

branches: 1.2.4;
A bunch of small fixes to make boot work on most VAXen.

New boot program for vax. Appearance similar to the i386 boot blocks.