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NetBSD Documentation:
NetBSD/acorn26 Unsupported Hardware List
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This list is intended to collate information about hardware which isn't
supported by NetBSD/acorn26, but which could/should be.
Podules
Miscellaneous expansions
Built-in hardware
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The VIDC audio system should be fairly similar to the Risc PC one, whose
driver lives at sys/arch/arm/iomd/vidcaudio.c.
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Archimedes-style machines use a Rockwell 6551 ACIA for the serial port.
This needs a driver, and should provide console support as well. I've
got a data sheet for the 6551 and plenty of machines with them in.
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Old-style machines use a WD1772 FDC. This is the same chip as is used
in certain atari machines. Their driver is in
sys/arch/atari/dev/fd.c. There should be an MI version.
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The Archimedes parallel port is a very simple device and should be easy to
support. The A3000 TRM explains how it works.
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The original Archimedes hard disc interface is based on the Hitachi HD63463.
Linux has a driver for it.
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IOEB machines use the 765-compatible floppy controller on the
82C71x. This seems to get a new driver for every machine it's
found in, so we need one for acorn26 (probably based on the acorn32 one in
sys/arch/acorn32/mainbus/fd.c).
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Machines like the A5000 use an 82C71x Universal Peripheral
Controller to provide the motherboard I/O devices. Support is in the
source tree, but is mostly untested.
Podules
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The asc driver ported from NetBSD/acorn32 hangs while probing absent
devices. This should be fixed. It may also be worth looking at the patches
in
PR#10539 and
PR#8484.
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The Castle
EtherSCSI
card contains an AMD 53c94 and an Intel 82595. The 53c94 seems to be
supported by sys/dev/ic/ncr53c9x.c, and seems to have some
standard pseudo-DMA support in e.g. sys/dev/isa/esp_isa.c
The 82595 has an ISA driver in
sys/dev/isa/if_iy.c, which looks amenable to porting. The
Storm16 seems to be
the same card without the Ethernet components fitted.
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Nexus was SJ Research's proprietary ATM network system. At its lowest level,
it seems to use INMOS Link over differential twisted pair cabling, and looks
much like a very fast (20Mbit/s) serial port. All the higher-level protocol
is handled in software, but implementing PPP over it ought to be easy enough.
SJ Research mutated into SJ Consulting,
and the Nexus is (I believe) now supported by
ExpLAN.
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I've got a Computer Concepts
ColourCard, which is a replacement framebuffer for the Archimedes.
It only works sporadically, but
is very nice when it does. It uses an INMOS G332 framebuffer chip, which
has some support in NetBSD (sys/arch/pmax/dev/ims332.c). The
framebuffer data is copied to the card from the Arc's video memory by
means of a ribbon cable which plugs into the VIDC's four-bit digital
output (which is usually used for hi-res mono modes). This means that
using it as an independent framebuffer may be tricky unless there's some
other way to get data in. FWIW, it's this copying mechanism that seems to
be playing up on mine.
In its default state, the card's sufficiently backward compatible that I
can boot NetBSD displaying through it, which is cute.
Computer Concepts no longer have any programming documentation for it
available.
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I've got a Wild Vision Sound Sampler podule, branded "Clares". Computer
Concepts (who took over Wild Vision) deny all knowledge of this card.
Clares couldn't find much information about it. Disassembling the RISC OS
driver indicates it's a very crude card -- I can't yet work out how it gets
the timing of samples right (if, indeed, it does).
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A 16-bit sound and MIDI card made by Wild Vision. The sound side is an
AD1848, supported by sys/dev/ic/ad1848.c. The MIDI interface
uses a 16550.
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Another Wild Vision job, this has a Yamaha YMZ263 for sound and MIDI, and a
lot of Philips chips for video decoding.
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I've got one of these too. It's based around a 65C22, and I've drawn out
most of the circuit diagram, so it should be easy enough to write a driver
for it. Computer Concepts deny all knowledge of this one too.
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This is based on a 16550, so driving it should be easy. I've got the
com driver attaching properly. Now we just need a MIDI line
discipline.
acemidi0 at podulebus0 slot 3
com0 at acemidi0: ns16550a, working fifo
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A proprietary CD-ROM interface used by Panasonic. I've only got the card,
not the drive. The card seems fairly simple, and Theo Markettos has
collected
some information on the interface.
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The user port is the traditional 6522, while the MIDI is an SCC2691. I've
got data sheets for both, and the card's documented in the A3000 TRM.
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Provides a user port (6522), 1MHz bus, Analogue input (D7002) and optional
MIDI (SCC2691, not fitted on mine). Sorting out good abstractions for the
BBC I/O ports might be interesting.
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A subset of the BBC I/O board, with just the 6522 and D7002 present.
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Like the HCCS one, but by a different manufacturer (and possibly with a
different memory map).
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Yet another one.
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A board for the A3020 (with variants for other machines) which could take
three "micro-podules", none of which I have. The main board also has a user
port on it.
Miscellaneous expansions
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There are two types of FPU available for acorn26 systems: the Acorn FPPC/WE32206
combination and the ARM FPA. They use the same instruction set, though their
Control Registers are different. NetBSD/acorn26 should at least have kernel
support for saving and loading FPU state on context switches.
I've got an FPPC card.
The RISC OS 2 and RISC OS 3 PRMs each contain information on the
FPUs in the Floating Point Emulator chapter. Each version
includes some information the other misses out.
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