Good day,
I have used the Ubuntu 8-based EMC2 succesfully in an old Compaq Armada
500, no (big) problems. I have found it quite useable (at least the basic
features I understand) for my hobby use, which I appreciate a lot.
However, on upgrading to Ubuntu 10 (as per the instructions on
linuxcnc.org), I found that the new software no longer plays happy with my
laptop. EMC2 (2.4.6) complains:
Debug file information:
insmod: error inserting '/usr/realtime-2.6.32-122-rtai/modules/rtai_hal.ko': -1
Operation not permitted
1386
PID TTY STAT TIME COMMAND
Stopping realtime threads
RTAPI: ERROR: could not open shared memory (errno=2)
HAL: ERROR: rtapi init failed
halcmd: hal_init() failed: -22
NOTE: 'rtapi' kernel module must be loaded
Unloading hal components
At the bottom of the debug file, there is an error (seems to come from
dmesg) that reads:
[ 149.620265] RTAI[hal]: ERROR, LOCAL APIC CONFIGURED BUT NOT
AVAILABLE/ENABLED.
So it looks to me that this venerable laptop has too old (buggy?) an
APIC to play with the newer kernels. I have investigated in that direction but
failed to come up with something (a patch, a kernel parameter, etc) useful. I
did upgrade the laptop to the latest available BIOS (using perhaps the last
working floppy disk in town), no difference.
I can always go back to Ubuntu 8, but I think that Ubuntu 10 could be
tweaked to work. I guess it is a bit of an obsession right now and that perhaps
I should make a clean install of Ubuntu 8 and be done with it, but I have this
habit of never looking back. I no longer expect to be understood, tolerated is
enough, thanks :)
I have tried compiling a kernel from source and have tried a couple of
them with no luck so far. The documentation I found on the RTAI site
(http://www.rtai.org/) is very outdated. Is there any documentation about
patching a newer kernel (2.6.32 at least, even 3.0) with RTAI? How about the
old (buggy?) APIC? Any pointers or ideas appreciated.
Thanks!
--
Alfredo Sola
http://alfredo.sola.es/
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