Re: linux 2.0.36

[Ray Henry <rehenry-at-up.net>]

This recent post from Will probably explains why I'm having so much trouble
setting up EMC on 2.2.14.  I can get the rt patch to work and run the
examples okay but EMC is not at all happy.  

What is the best approach for those with 2.2.14 packages?

	Find an earlier package.
	Use the 2.2.13 prepatched kernel with the newer package.
	Update the EMC stuff to accept 2.2.14.

If the last answer is the prefered solution, how?

Ray


At 08:40 AM 5/8/2000 -0400, you wrote:
>
>> From: Jon Elson <jmelson-at-artsci.wustl.edu>
>> Will Shackleford wrote:
>> 
>> > In response to complaints from Tim and Fred, I will reinstall RedHat
5.2 on
>> > another partition and  try to get the May-5 version of EMC built for
linux
>> > 2.0.36. Although it probably won't be ready until May-8,
>> > I'll still call it the May-5 version.
>> 
>> Much appreciate the effort!  Is it only the scripts that need to have the
>> right directory names for some of the .h files, etc. for RT, or are there
>> real differences in the code to be compatible with the 2 versions
>> of Linux?
>> 
>> Thanks,
>> 
>> Jon
>> 
>> 
>
>The differences that I can come up with of the top of my head are:
>
>
>1. The 2.0.36 distribution comes with the RCS libary pre-compiled for
2.0.36 and 
>rtlinux 09J.
>2. The source code files are all the same, but within the files there are 
>numerous sections that look something like this:
>
>
>#ifdef linux_2_2_13
>
>// Code for linux_2_2_13
>
>
>#else
>
>// Code for linux_2_0_36
>
>#endif
>
>The correct segment of code is included by the compiler by passing either 
>-Dlinux_2_2_13 or -Dlinux_2_0_36 as a command-line option to gcc or g++.
>
>3. In a few cases there are source files that are not compiled at all
under one 
>of the platforms. In order to control this the makefiles have lines that
look 
>like this:
>
>ifeq (linux_2_0_36, $(PLAT))
>
># lists of files only for linux_2_0_36
>
>else
>
>
>endif
>
>4. As you noted the install scripts are different.
>
>5. The 2.2.13 uses a different set of fuctions to interface with rtlinux
than 
>2.0.36, they not only changed the header file names but most of the function 
>names and data types.
>
>6. 2.2.13 uses mbuff to access the shared memory between the real-time and 
>non-realtime processes, where as 2.0.36 uses a static address.  (2.2.13
doesn't 
>need append= flag added to lilo.conf and  won't use it if you add the append 
>flag so adding it just wastes memory.) 
>
>7. The simctrl and stripchart tools require GNOME libs so I will probably 
>disable them in 2.0.36. Those libs come with the RedHat 6 distributions
but not 
>the earlier distributions. It might be possible to install them but I am not 
>sure it is  worth it.
>
>8. simmod was built using a seperate mbuff for simulation control and
since this 
>is hard to do with the static addresses, simmod will probably need to be 
>disabled in 2.0.36.
>
>-- will