[rtl] Re: PC104 A/D boards

[David Schleef]

On Mon, Jun 05, 2000 at 03:55:04PM +0200, Vasili Goutas wrote:
> I'm looking for a PC104 A/D board supported by comedi with following
> properties
> 4 analog input,
> 4 analog output decoupled,
> 4 digital input,
> 4 digital output decoupled,
> hardware timer.
> 
> It could also be two boards with these properties in sum.
> If you know such a board, please send me an email ?
> 


ComputerBoards (www.computerboards.com) makes several PC104
boards that are supposed to be identical to their ISA
counterparts.  Unfortunately, Comedi support for these boards
is a bit sketchy, with a few individual boards in the DAS series
being supported, while the others are supported if you can
guess the magic to fit it all together.  I've only recently
been learning of details of all the DAS boards, and I'm
strongly considering rewriting the DAS drivers in the near
future.

The other well-supported manufacturers, DT and NatInst, do
not seem to manufacture PC104 boards.



dave...

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[rtl] Let's continue to write RT Manual

[omill]

Hello,
We all know that RT Manual 
at 
http://www.rtlinux.org/rtlinux.new/documents/documentation/RTLManual/RTLManual.html
has not been updated .

Would RT Linux community be interested in submitting some  documentation ?

Sincerely,
Olga Mill



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Re: [rtl] Which Linux?

[Mark]

Basically the only rule I know of is make sure you have the correct RTL
patch for your kernel source. You can get the Linux kernels from
http://www.kernel.org. Either that or download a pre-patched kernel.

Mark

In message ,
Heinicke, Eric <[EMAIL PROTECTED]> writes
>From a newbie:
>  Is there a preferred flavor of Linux to use with RTLinux?
>
>Thank You.
> 
>Eric O. Heinicke   [EMAIL PROTECTED]
>BAE SYSTEMS Voice:631.262.8644 
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>
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[rtl] Which Linux?

[Heinicke, Eric]

>From a newbie:
  Is there a preferred flavor of Linux to use with RTLinux?

Thank You.
 
Eric O. Heinicke   [EMAIL PROTECTED]
BAE SYSTEMS Voice:631.262.8644 
   Fax:  631.262.8657
   One Hazeltine Way, MS 1-78
   Greenlawn, NY 11740-1606

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No Subject

[roux jean-denis]

   Hi guys,

  I have a question about the RTLinux architecture. I
know that both RTAI and RTL turn Linux as a task
running when no other RT task need the processor. The
thing is that I understand quite well the concept of
RTHAL used by RTAI but how RTL works ?

  regards
  Jean-Denis ROUX

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[rtl] Assembler Warnings?

[bionic]

Howdy-
After a string of earth shattering crashes, I was forced to reinstall my
distribution (a modified Red Hat.) I'm running the same kernel I was
before, 2.2.14-rtl-2.2, but my rt process, which compiled warning free
before the distribution reinstall, is compiling with the following
warnings>>

/tmp/ccrHgF4h.s: Assembler messages:
/tmp/ccrHgF4h.s:580: Warning: translating to 'fst %st(1)'
/tmp/ccrHgF4h.s:609: Warning: translating to 'fst %st(1)'
/tmp/ccrHgF4h.s:632: Warning: translating to 'fst %st(1)'
...and so on

The rt module insmods and runs fine, as far as I can tell.
Does anyone know what these warnings are about?

Chuck

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Re: [rtl] APM alert !!!!

[David Schleef]

On Mon, Jun 05, 2000 at 12:34:45PM +0400, Michael Barabanov wrote:
> Linux 2.3.xx kernels allow APM support to be built as a module.
> This feature solves the problem for at least RTL 3.0.
> 
> Michael.
> 


How does compiling as a module help?



dave...

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[rtl] PC104 A/D boards

[Vasili Goutas]

I'm looking for a PC104 A/D board supported by comedi with following
properties
4 analog input,
4 analog output decoupled,
4 digital input,
4 digital output decoupled,
hardware timer.

It could also be two boards with these properties in sum.
If you know such a board, please send me an email ?

TIA
Vasili

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[rtl] PC104 A/D boards

[Vasili Goutas]

I'm looking for a PC104 A/D board supported by comedi with following
properties
4 analog input,
4 analog output decoupled,
4 digital input,
4 digital output decoupled,
hardware timer.

It could also be two boards with these properties in sum.
If you know such a board, please send me an email ?

TIA
Vasili
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  Dipl. Ing. technische Informatik
  Vasili Goutasfax: +49 40 529567-99

  - Software Developer - internet: www.sensologic.de

  Hummelsbütteler Steindamm 78a
  22851 Norderstedt, Germany   Software + Sensor Systems

  e-mail:   [EMAIL PROTECTED]
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Re: [rtl] APM alert !!!!

[Paolo Mantegazza]

Michael Barabanov wrote:
> 
> Linux 2.3.xx kernels allow APM support to be built as a module.
> This feature solves the problem for at least RTL 3.0.
> 
> Michael.
> 
> David Schleef ([EMAIL PROTECTED]) wrote:
> > On Thu, Jun 01, 2000 at 04:37:35PM +0100, Stuart Hughes wrote:
> > > Hi Victor,
> > >
> > > Tried it on RTLinux 2.3/Linux 2.2.14.  Exactly the same effect.  If you
> > > cat /proc/apm, the jitter jumps out to ~ 7 miliseconds.
> > >
> > > Regards, Stuart.
> > >
> >

I see that you also discovered the missing safe_halt() in acpi.c, while
that macro, defined in system.h, was used in apm.c.

Since you are likely in contact with plain linux "kernellers" that
count, can you tell them that to keep it simple the same macro must be
used wherever is needed, instead of repeating the inlining of the
related __asm__ __volatile__.

RTAI and RTL users must know that this is one of those cases in which
inlined hard "sti"s can do a lot of harm once the kernel is patched for
real time.
Just mate a __cli() to a __asm__ __volatile ("sti") and you are screwed
up.
So if you are using __cli(), for disabling interrupts in Linux, always
mate it with its brother __sti(). Never inline "sti".

Ciao, Paolo.
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[rtl] Log rtl_printf calls?

[Jochen Kuepper]

Tobias Klotz writes:
 > are the outputs made by rtl_printf written to a logfile somewhere? I
 > cannot find them in the usual places but I would need them to do a post
 > mortem analyze of my system after a crash...

Don't they go to /var/log/messages ? Probably you need to edit
/etc/syslog.conf. But anyway you won't get the last log's before an
crash, I assume :-O

Jochen
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Re: [rtl] rtllinux-2.0 support NE2000 compatiable NIC?

[Stuart Hughes]

dickleey wrote:
> 
> hi,everybody!
> After I compile my Kernel with rtlinux-2.0,
> I found I lose my NIC,and in with common linux kernel 2.2.10,the card can be found.
> 
> I wonder rtllinux-2.0 support NE2000 compatiable NIC?
>
Hi,

I'm not sure if this is your problem, but on RedHat 6.0 (and possibly
others), after a rebuild, network cards don't work if the driver is
modular.  My fix to this (and it's a hack) is to edit /sbin/ifup, find
the lines:

# is this device available? (this catches PCMCIA devices for us)
/sbin/ifconfig ${REALDEVICE} 2>&1 | grep -s "not found" > /dev/null
if [ "$?" = "0" ]; then

and change it to:
# hack to modprobe the ethxx device
/sbin/modprobe ${REALDEVICE}

# is this device available? (this catches PCMCIA devices for us)
/sbin/ifconfig ${REALDEVICE} 2>&1 | grep -s "not found" > /dev/null
if [ "$?" = "0" ]; then

Also, make sure that you have the appropriate entry in
/etc/conf.modules, for an ne2000 it should be (from memory)
alias eth0 ne

Regards, Stuart
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Re: [rtl] APM alert !!!!

[Michael Barabanov]

Linux 2.3.xx kernels allow APM support to be built as a module.
This feature solves the problem for at least RTL 3.0.

Michael.

David Schleef ([EMAIL PROTECTED]) wrote:
> On Thu, Jun 01, 2000 at 04:37:35PM +0100, Stuart Hughes wrote:
> > Hi Victor,
> > 
> > Tried it on RTLinux 2.3/Linux 2.2.14.  Exactly the same effect.  If you
> > cat /proc/apm, the jitter jumps out to ~ 7 miliseconds.
> > 
> > Regards, Stuart.
> > 
> 
> 
> Every so often, a thread comes up in the Linux kernel mailing list about
> modifying the kernel to run APM inside a virtual machine, since APM also
> causes problems with SMP.  There is already other code doing this, such
> as (I think) the VESA framebuffer code and BIOS calls on other
> architectures.  Usually, the thread erupts into a flamewar about the
> stupidities involved with running something inside a virtual machine
> _inside_ the kernel.
> 
> Supposedly, ACPI will solve these problems, except that a) ACPI doesn't
> work on my machine, and b) the user-space ACPI code was developed
> independently from the APM code, and thus is incompatible.  Go figure.
> 
> 
> 
> dave...
> 
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Re: [rtl] SEMAPHORE MODULE DON´T COMPILE

[Stuart Hughes]

Hi Victor,

That's correct, the portable fifos/semaphores/mailboxes can be found at
http://www.zentropix.com/products/download.html by selecting
rtai_rtl_fifos-04.tar.gz
Please note that I have not tested this since RTLinux 2.0 or RTAI 1.0. 
Please let me know if you have any changes you want to go in.

Regards, Stuart


[EMAIL PROTECTED] wrote:
> 
> Stuart:
> According to Steve, the Zentropix fifos/semaphore package works on
> RTL as well. Or is my memory failing?
> 
> On Sun, Jun 04, 2000 at 10:40:51AM +0100, Stuart Hughes wrote:
> > Hi Gus,
> >
> > RTAI has support for POSIX mutexes (pthread_mutex_xx including priority
> > inheritance) as well as non-POSIX mutexes and semaphores and mailboxes.
> > This can be downloaded
> > from http://www.rtai.org/
> >
> > RTLinux has support for POSIX mutexes.  AFAIK the non-POSIX IPC package
> > is not yet available.
> >
> > Regards, Stuart.
> >
> >
> > Gusa wrote:
> > >
> > > Hi people
> > >
> > > I need the use of semaphores inside the RT kernel to do some tests.
> > >
> > > 1) First I would know if there is some primitives done?? I didn´t find
> > > any.
> > >
> > > 2) Can I implement a semaphore in a simple way? Have you got an idea?
> > >
> > > 3) I´m trying to compile the semaphore module that comes with the
> > > rtlinux distribution.
> > > I´ve done make and ...
> > > I´ve lot of errors, that´s imposible to put it all in the message.
> > > Can anybody tell me if have experience in compiling/using this module??
> > > Do i have to do something undocumented?
> > > I was trying to contact Jerry Epplin, the author of the module, but his
> > > site on the web is not responding.
> > >
> > > I´m using RT kernel 2.0 and linux kernel 2.2.14.
> > > I have compiled various of the examples that come with the distribution
> > > and i didn´t have any problems. I thougth that compile this module was a
> > > simple thing.
> > >
> > > Best regards for everybody.
> > >
> > > Gus
> > >
> > > I´m not going to say in all my messages "Sorry for my poor english".
> > > It´s a waste of time.So everybody must know that I´m Uruguayan (You can
> > > find Uruguay in South America, behind Argentina and Brasil), and i´m
> > > doing my best effort so you can understand my e-mails.
> > > Thanks everybody.
> >
> >
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> -
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> VJY Associates L.L.C, New Mexico.
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[rtl] Log rtl_printf calls?

[Tobias Klotz]

Hello,

are the outputs made by rtl_printf written to a logfile somewhere? I
cannot find them in the usual places but I would need them to do a post
mortem analyze of my system after a crash...

thanks!

tobias

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Re: [rtl] RTAI and Semaphores timing (2) !

[Paolo Mantegazza]

Hi,

Karim got better than I could explain it myself.

Take into account that also the global cli/sti stuff is mostly taken
from ideas found in Linux irq.c

However the big difference between scheduling on the same and on another
CPU is due to the need of sending an InterProcessorInterrupt (IPI) to
the other CPU to have it schedule the task that could not be scheduled
on the CPU that made it ready, because other, higher or equal, priority
could be scheduled on it.

The IPI bus is not a kind of lightning, open drain two wires max 16 Mhz,
and can take a few us on its own, just to send the IPI.

The SMP scheduler is aimed at max flexibility, if you can statically
bound your task to a CPU it is likely you can get better performances
with the MUP scheduler.

Ciao, Paolo.
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