Re: [rtl] Draft of ``Real Time and Embedded HOWTO''

[Bernhard Kuhn]

[EMAIL PROTECTED] wrote:

> x86 MiniRTL fits on a floppy and runs in 4Meg.

Sure, but IMHO that was not was Herman is thinking
of. I am sure, he is talking about stuff like
engine control systems, heaters, fluid-controllers
- stuff were usualy a bare C-Coded 8051 is quite enough.
But today, evene these apps have to have a build in
web-server with database and three tier architecture :-)
Then, Linux just fits in perfectly ...



> > 3) uClinux just takes two seconds for booting
> > (ok, network setup takes three more)
> 
> One of my favorite projects:
>http://www.acl.lanl.gov/linuxbios/

Yeah! Right, realy funny thing!
There will once the day i will find the time to
try it out :-)


Bernhard
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Re: [rtl] Draft of ``Real Time and Embedded HOWTO''

[yodaiken]

On Thu, Aug 31, 2000 at 11:53:42PM +0200, Bernhard Kuhn wrote:
> 1) Please have a look at the MIPS-Port and uClinux
> and don´t just discribe why x86-Linux isn´t
> convenient for most embedded applications.

x86 MiniRTL fits on a floppy and runs in 4Meg.

> 3) uClinux just takes two seconds for booting
> (ok, network setup takes three more)

One of my favorite projects:
   http://www.acl.lanl.gov/linuxbios/

> BTW: Right now, there are only seven participants filled at
> http://www.thinkingnerds.com/projects/rtos-ws/participants.html
> I hardly can believe that there are not more people
> interessted in the linux real time workshop!?


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-- 
-
Victor Yodaiken 
Finite State Machine Labs: The RTLinux Company.
 www.fsmlabs.com  www.rtlinux.com

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Re: [rtl] Draft of ``Real Time and Embedded HOWTO''

[Bernhard Kuhn]

Hi Herman!

Overall, you did a good Job, but i strongly
disagree with some statements in chapter 3.2:

>>>
The Linux kernel that supports a typical desktop
computer is quickly more than 1 megabytes large.
And that does not include the memory taken
up by the Linux tools and the users' applications
Hence, the Linux footprint is too large for most
embedded systems. It also takes about a minute
or so to boot, which is much too long for most
embedded systems. And it expects at a hard disk
to work with, and a power supply of more than
100 Watts for modern high-end CPUs, video cards
and hard disks.
<<<

1) Please have a look at the MIPS-Port and uClinux
and don´t just discribe why x86-Linux isn´t
convenient for most embedded applications.
(for example, a staticaly linked
binary of a Tetris-clone for the uClinux/framebuffer
has a size of just 11 KByte. A Minesweeper-Clone
even fits into 8 KByte -- i just feel back in the
times of C64 :-))

2) Telekommunication switching systems, computer
numeric machine control systems and similar process
control systems are also embedded applications
(having moderate real time constraints within few
milliseconds and a huge market share, btw).
Here, the recources are not a matter of fact but the
number of features, the embedded os can deliver
ootb.

3) uClinux just takes two seconds for booting
(ok, network setup takes three more)

Just my 0.02 Euro ...

Bernhard


BTW: Right now, there are only seven participants filled at
http://www.thinkingnerds.com/projects/rtos-ws/participants.html
I hardly can believe that there are not more people
interessted in the linux real time workshop!?
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[rtl] Draft of ``Real Time and Embedded HOWTO''

[Herman Bruyninckx]

I've been working some weeks on an HOWTO for beginning users of
real-time and embedded systems. RTLinux and RTAI are, of course, an
important part of that HOWTO. It is complementary to other HOWTO
efforts, that deal with installation and API details of the packages;
my HOWTO explains the differences between a general purpose OS and a
Real-Time and/or Embedded OS.

The text is not finished yet, but it has reached a state where I think
it begins to be useful. I would very much appreciate any feedback,
additions, collaborations, links to related efforts, etc. Thanks!

The Real Time and Embedded HOWTO can be found at:
   

I plan to release it to the Linux Documentation Project after I've
included the (many) comments I expect :-)

--
[EMAIL PROTECTED] (Ph.D.)Fax: +32-(0)16-32 29 87
Dept. Mechanical Eng., Div. PMA, Katholieke Universiteit Leuven, Belgium

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