Notes on the NetBSD/da30 port.
------------------------------
This directory contains a port of NetBSD to the DA-30, a single-board
computer based on the MC68030 microprocessor. There is exactly one
DA-30 in existence: it's the wire-wrap prototype of a robot
controller. Unfortunately the local company making the robots that I
designed the DA-30 for stopped making robots and started importing them
instead :-(. So I added some disk and a graphics interface, and now
it's my home system. This port won't be directly applicable to
anybody else's machine, but I hope it will be useful as an example;
perhaps some of the drivers may be useful to somebody also.
This system differs from "traditional" NetBSD in that one hard disk
has a sector size of 1024 bytes rather than 512. The file "patches"
in this directory contains modifications to miscfs/specfs/spec_vnops.c
to support sector sizes other than 512 bytes. (The system still
requires that swap disks have 512-byte sectors.)
Specifications:
- MC68030 CPU at 16.67 MHz
- MC68881 floating-point coprocessor
- 5MB of RAM (could be upgraded to 8MB)
- 128kB of EPROM, containing boot code
- 32kB of battery-backed SRAM
- calendar/clock (DP8570 RTC)
- 4 serial ports (Z85C30 SCC)
- SCSI interface (WD33C93A SBIC),
connected to 100MB SCSI disk
- Graphics processor: TMS34010 GSP with 512kB of VRAM,
driving a 880 x 600 x 4 bit/pixel display
- WD1002-05 hard disk/floppy controller,
controlling a 45MB hard disk and a 3.5" floppy
- IDE disk drive (250MB)
- VME interface (currently not used).
MACHINE for this system is "da30", and MACHINE_ARCH is "m68k".
The port is based largely on the hp300 port, with the exception of the
device drivers and the autoconfiguration code. I use config.new, and
the autoconfiguration is based on the information in ioconf.c, which
is derived from the config file.
The physical address space of the system is organized as follows:
00000000 - 007FFFFF RAM
00800000 - 0081FFFF EPROM
00900000 - 00907FFF battery-backed SRAM
00E00000 - 00EFFFFF I/O space (internal)
00F00000 - 00F0FFFF VME A16 address space
01000000 - FEFFFFFF VME A32 address space
FF000000 - FFFFFFFF VME A24 address space
I/O space is divided into 16 "slots". Slot n occupies addresses
00En0000 - 00EnFFFF. Slots are currently assigned as follows:
0 SCC 1 (serial comms controller)
1 SCC 2
4 calendar/clock
5 WD1002-05 hard + floppy disk ctrler
6 IDE disk drive
7 TMS34010 graphics processor
9 SCSI bus interface controller
Paul Mackerras paulus@cs.anu.edu.au
Dept. of Computer Science
Australian National University.
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