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