LinuxQuestions.org
Review your favorite Linux distribution.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Software
User Name
Password
Linux - Software This forum is for Software issues.
Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum.

Notices


Reply
  Search this Thread
Old 02-21-2018, 06:00 AM   #1
barz_83_LQ
Member
 
Registered: Apr 2017
Posts: 31

Rep: Reputation: Disabled
RTLinux kernel build/patch (This is not PREEMPT_RT) - need help


Hello,

I am trying to build real time Linux kernel (not the PREEMPT_RT but the RTLinux which is not in active development currently).

Questions:
1) I have explored very much for the RTLinux patch but could not get that. If anyone can provide the patch, it would be great.(Kernel version is not a problem, I need a patch for any version)

2) I could get the RTLinux kernel source on github at (Latest commit on 3.x kernel)
https://github.com/clrkwllms/rt-linux.git

I got error related to libsas (related to scsi) and disabled some scsi options in kernel config and rebuilt successfully but boot fails, dropping to initramfs shell, where it shows /proc/devices not found error. I doubt if this is due to disabling some scsi options in config file.

3) Great if anyone can share their experiences reg this and inputs on how to proceed with the RTLinux kernel source build. I need RTLinux in particular and not any alternatives or similar ones like RTAI.

Thanks and regards,
 
Old 02-21-2018, 08:22 PM   #2
jefro
Moderator
 
Registered: Mar 2008
Posts: 18,092

Rep: Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709
All roads seem to lead to WindRiver. Might ask them for download access.

Might search out people who may still have information. https://www.cs.fsu.edu/~baker/realti...s/rtlinux.html I assume the guy still works there.
 
1 members found this post helpful.
Old 02-23-2018, 04:46 AM   #3
barz_83_LQ
Member
 
Registered: Apr 2017
Posts: 31

Original Poster
Rep: Reputation: Disabled
Dear jefro,

Yes any links from blogs etc which were earlier pointing to FSMlabs or other are redirected to windriver website, but not to any particular page of windriver that can provide relevant information.I think that's not good, not sure of what happened to GPL licensing terms (probably, the license validity period is over and the GPL license is revoked; am not an expert of open source licenses, so not sure) when windriver has taken over FSM Labs.

I have already mailed to an existing fsmlabs support mail id and valid one and got acknowledgement mail, but no further response.

That apart, trying to contact Mr. Ted Baker, the author of the post you had sent the link.

Thank you very much for your time,
 
Old 02-23-2018, 05:03 PM   #4
jefro
Moderator
 
Registered: Mar 2008
Posts: 18,092

Rep: Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709Reputation: 2709
Might look at QNX too. It has been around a long time and may be able to be purchased for use. I think you can download QNX 6 still. There was an openqnx but doubt that ever took off.

MenuetOS I think is supposed to be real time.
 
1 members found this post helpful.
Old 02-24-2018, 09:59 PM   #5
barz_83_LQ
Member
 
Registered: Apr 2017
Posts: 31

Original Poster
Rep: Reputation: Disabled
Thank you for the valuable information jefro.
Your inputs are very helpful.

I have got patch with kernel source for. 2.4.20 at the link (by Mr Ted Baker) you mentioned above and working on that. It is taking time ( as the source looks unstable or interim sort of and for particular architecture, or apt for 32 bit, or compatibility issues with older gcc and gcc5 that am using...) for me to build kernel making corrections as the build errors are shooting up one after the another.

I am currently stuck at below error.I believe it is related to architecture (32/64) but do not know how to resolve, checking that:
(Last lines of the kernel build log )

/usr/src/rtlinux-3.2-pre2/linux-2.4.20/include/asm/apic.h:81:20: warning: ‘nmi_watchdog_tick’ declared ‘static’ but never defined [-Wunused-function]
static inline void nmi_watchdog_tick (struct pt_regs * regs);
^
process.c: Assembler messages:
process.c:461: Error: unsupported instruction `mov'
process.c:462: Error: unsupported instruction `mov'
process.c:463: Error: unsupported instruction `mov'
process.c:464: Error: unsupported instruction `mov'
process.c:513: Error: unsupported instruction `mov'
process.c:517: Error: unsupported instruction `mov'
process.c:519: Error: operand type mismatch for `pop'
process.c:523: Error: operand type mismatch for `pop'
/usr/src/rtlinux-3.2-pre2/linux-2.4.20/Rules.make:60: recipe for target 'process.o' failed
make[1]: *** [process.o] Error 1
make[1]: Leaving directory '/usr/src/rtlinux-3.2-pre2/linux-2.4.20/arch/x86_64/kernel'
Makefile:320: recipe for target '_dir_arch/x86_64/kernel' failed
make: *** [_dir_arch/x86_64/kernel] Error 2

My machine is :Intel(R) Core(TM)2 Duo CPU P9600 @ 2.66GHz
OS : x86_64 x86_64 GNU/Linux

NOTE: I tried giving option -m32 in the highest level makefile which is caught by make bzImage, but it din help.


Thanks and regards,
 
Old 02-26-2018, 08:10 PM   #6
barz_83_LQ
Member
 
Registered: Apr 2017
Posts: 31

Original Poster
Rep: Reputation: Disabled
Error output when added -m32 when trying to resolve Unsupported instruction mov error, and doing make bzImage:

brt@brt:/usr/src/rtlinux/linux$ sudo make bzImage
make -C arch/x86_64/tools /usr/src/rtlinux-3.2-pre2/linux-2.4.20/include/asm-x86_64/offset.h
make[1]: Entering directory '/usr/src/rtlinux-3.2-pre2/linux-2.4.20/arch/x86_64/tools'
gcc -D__KERNEL__ -I/usr/src/rtlinux-3.2-pre2/linux-2.4.20/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -m32 -fomit-frame-pointer -mno-red-zone -mcmodel=kernel -pipe -fno-reorder-blocks -finline-limit=2000 -fno-strength-reduce -S -o offset.tmp offset.c
offset.c:1:0: error: code model ‘kernel’ not supported in the 32 bit mode
/* Written 2000 by Andi Kleen */
^
Makefile:18: recipe for target 'offset.h' failed
make[1]: *** [offset.h] Error 1
make[1]: Leaving directory '/usr/src/rtlinux-3.2-pre2/linux-2.4.20/arch/x86_64/tools'
arch/x86_64/Makefile:92: recipe for target 'checkoffset' failed
make: *** [checkoffset] Error 2


NOTE: Got above error, when I added -m32 option to wither HOSTCFLAGS or CFLAGS or both. Kindly help
 
  


Reply

Tags
build from source, config, realtime, scsi


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
Kernel build with PREEMPT_RT patch (Ubuntu 16.04, 4.4.1 kernel) : Inputs related to reducing jitter/scheduler latency barz_83_LQ Linux - Kernel 4 12-04-2017 07:37 PM
What paremeters to add to .config to allow kernel build with a reiser4 patch [reiser4-for-4.11.0.patch.gz]? Glenn D. Linux - Software 1 08-05-2017 11:49 PM
[SOLVED] [Language problem] Hard real time in user space with preempt_rt patch TheIndependentAquarius Linux - Kernel 2 05-15-2012 07:01 AM

LinuxQuestions.org > Forums > Linux Forums > Linux - Software

All times are GMT -5. The time now is 06:25 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration