Re: 1 euro Olimex RISC-V mini-PC: this needs Forth ;)

albert@spenarnc.xs4all.nl wrote:

In article <vetqgo$1k6sl$1@paganini.bofh.team>,
Waldek Hebisch <antispam@fricas.org> wrote:

albert@spenarnc.xs4all.nl wrote:

In article <vesgmb$1i2rq$1@paganini.bofh.team>,
>
For what it is worth.
I have ported the ciforth model (only 64 bits,the 5.4.0 level) onto
linux running on a riscv, taking advantage from earlier Dutch
implementation of noforth for triecky code words (UMD/MOD).
http://home.hccnet.nl/a.w.m.van.der.horst/lina.html
As usual, all words are extensively tested, all words are documented.

>
Thanks, works on Milkv.
>

Once you have mapped the io space in virtual space and access it
via VMA-IO, you can apply all knowledge gained from the documentation
of the underlying System On a Chip.
For this particular board the printed circuit layout, the schematics
(9 pages) and a full 1000+ page documentation of the SoC (Allwinner
D1) is available. That is why I bought it.

>
For Milkv there are schematics and chipset documentation (I did not
check how complete it is).

 
Could you try if the mapping succeeds?
Start up as root.
Now do
  MMAP-IO
and check VMA-IO
It contains the virtual memory address, or possible an error code
-13. The SoC descriptions maps from VMA-IO.
You can also check DEV-MEM that should be 4, normally.
In forth.lab you can see the use of MMAP-IO in relation to
a number of SoC's.
I strive to have working: set-function gpio-on gpio-off gpio-on.
The io-nummers are system dependant.

I get:

RISCV ciforth beta 2023Mar30
MMAP-IO
 OK
HEX
 OK
VMA-IO @ .
B2000000  OK
DEV-MEM @ .
3  OK

Datasheet says that device address space starts at 0x01000000
and ends at 0x7FFFFFFF (above is DRAM).  There is a command
line utility to do I/O.  Sending 0x01000000 to 0x03022000 turns on
blue LED, sending 0x0 truns it off.  AFAICS in lina corresponding
address is B2022000.  More generally, there are four GPIO devices
(ports).  Port 0 is at 0x03020000, port 1 at 0x03021000, port 2 at
0x03022000, port 3 at 0x03023000.  Device access should be done in
32-bit units.

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                              Waldek Hebisch