3 Sep
2012
3 Sep
'12
10:53 a.m.
The R? has gotten a mixed reception 'round here, but here is something
interesting: a tutorial of programming the thing (which makes this
sort-of kinda on-topic) in bare-metal Assembly; including talking to
the graphics chip as a plain bitmapped framebuffer and input from the
USB port (the latter using a library, I think).
I haven't received mine yet, but I really want to try that out...
http://www.cl.cam.ac.uk/freshers/raspberrypi/tutorials/os/
--
Joachim Thiemann :: http://jthiem.bitbucket.org ::
http://signalsprocessed.blogspot.com
3 Sep
3 Sep
11:27 a.m.
On Mon, Sep 3, 2012 at 10:53 AM, Joachim Thiemann
<joachim.thiemann at gmail.com> wrote:
The R? has gotten a mixed reception 'round here,
but here is something
interesting: a tutorial of programming the thing (which makes this
sort-of kinda on-topic) in bare-metal Assembly; including talking to
the graphics chip as a plain bitmapped framebuffer and input from the
USB port (the latter using a library, I think).
I haven't received mine yet, but I really want to try that out...
Very cool, and perfect timing. I'm about to go out and pick up a
fresh SD card for the R-Pi that arrived over the weekend.
Grabbing the tarball now...
Thanks!
-ethan
4:29 p.m.
New subject: sortof-OT: bare metal R?
On Mon, 3 Sep 2012 16:53:11 +0200
Joachim Thiemann <joachim.thiemann at gmail.com> wrote:
The R? has gotten a mixed reception 'round here,
but here is something
interesting: a tutorial of programming the thing (which makes this
sort-of kinda on-topic) in bare-metal Assembly;
If you wane do bare metal ARM
hacking there are severl nice ARM eval
boards. Have a look at e.g.: https://www.olimex.com/ Especially the
OLinuXino. It is designed to run Linux, like the RPi. I am tempted to
port NetBSD to it.
--
\end{Jochen}
\ref{http://www.unixag-kl.fh-kl.de/~jkunz/}
6:13 p.m.
New subject: sortof-OT: bare metal R?
On 9/3/12 1:29 PM, Jochen Kunz wrote:
On Mon, 3 Sep 2012 16:53:11 +0200
Joachim Thiemann<joachim.thiemann at gmail.com> wrote:
> The R? has gotten a mixed reception 'round here
All of my posts have been disappearing, we'll see if this one gets through.
The problem I see with the Cambridge examples is students don't LEARN anything
about what they're programming on. They're given a bunch of magic recipes and
don't learn what they're for. What you end up with is what you
could have done with 10 lines of Z80 assembly talking to a terminal through a
UART, but in the example you have to make your own terminal, talking to a big
blob of USB stack and graphics coprocessor glue.
4 Sep
4 Sep
5:20 a.m.
New subject: sortof-OT: bare metal R?
On Tue, Sep 4, 2012 at 12:13 AM, Al Kossow <aek at bitsavers.org> wrote:
The problem I see with the Cambridge examples is students don't LEARN
anything
about what they're programming on. They're given a bunch of magic recipes
and
don't learn what they're for. What you end up with is what you
could have done with 10 lines of Z80 assembly talking to a terminal through
a
UART, but in the example you have to make your own terminal, talking to a
big
blob of USB stack and graphics coprocessor glue.
Sorry, I don't see that. I think the article gives a reasonable level
of depth, explaining certain things in detail - see for example the
pink boxes on the right-hand side, explaining what eg. the assembler
instructions do. The article is far more in depth than just "type
these magic lines to see stuff".
And the fact that the GPU and USB stack are black boxes? For
introduction into OS concepts, why is that a problem (at the level
that this article is aimed at)? When introducing Z80 assembler, you
also look at the Z80 as a magic black box that you give commands to
which then does stuff. You don't need to know the internal
microarchitecture of a CPU to program it. (Yes, it helps, to the
advanced user - but to teach introductory assembly programming?)
--
Joachim Thiemann :: http://jthiem.bitbucket.org ::
http://signalsprocessed.blogspot.com
3:13 p.m.
New subject: sortof-OT: bare metal R?
that this article is aimed at)? When introducing Z80
assembler, you
also look at the Z80 as a magic black box that you give commands to
which then does stuff. You don't need to know the internal
Well, maybe you do But I figured out the basics of PDP11 machien code
from the 11/45 printset -- schematics and microcode
flows. It was all I
had. And it meant I really understood what was going on.
-tony
4339
days inactive
4340
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5 comments
5 participants
participants (5)
-
aek＠bitsavers.org -
ard＠p850ug1.demon.co.uk -
ethan.dicks＠gmail.com -
jkunz＠unixag-kl.fh-kl.de -
joachim.thiemann＠gmail.com