Thank you Jiri and Sankara. With your help I have successful compiled rt patch for Ubuntu on Pandaboard. I found that the ti omap kernel I downloaded with the command: sudo apt-get source linux-image-$(uname -r) ( tar file : linux-ti-omap4_3.0.0-1205.10.tar.gz ) is kernel version 3.0.4 despite it numbered: 3.0.0-1205. And it is the main reason why so many errors occurred when I try to patch patch-3.0-rt6 with this kernel. So I downloaded an earlier package :3.0.0-1201.5 at https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.0.0-1201.5 and patch with patch-3.0.1-rt11 . Then I only have to patch 03 errors to finish compiling. My process (compiling on Panaboard running Ubuntu 11.10) is a little bit different from yours, since i compile to generate .deb files. Basically it is : (1) tar xfv linux-ti-omap4_3.0.0-1205.10.tar.gz (2) cd to the folder extracted. (3) Edit file patch-3.0.1-rt11.patch to delete this part : Index: linux-2.6/localversion-rt =================================================================== --- /dev/null +++ linux-2.6/localversion-rt @@ -0,0 +1 @@ +-rt11 because it will make the compiler confuses between the local version omap4 and omap4-rt11 ( I am not sure this patch is correct or not, but without it I will have this error : "run-parts: executing debian/tests/check-aliases Checking for dupe aliases in omap4... Could not open /usr/src/ubuntu-oneiric/debian/linux-image-3.0.0-1201-omap4/lib/modules/3.0.0-1201-omap4/modules.alias at debian/tests/check-aliases line 10." (4) patch -p1 < ./patch-3.0.1-rt11.patch At this step, I have 1 unsuccessful patch with file /init/main.c I follow the .rej file and patch it manually. I think it is because of the omap4 kernel has some changes in main.c makes the patch does not match. (5) Edit file ubuntu-oneiric/ubuntu/aufs/mtx.h : change: lock->owner to: lock->lock.owner according to this patch : http://aufs.git.sourceforge.net/git/gitweb.cgi?p=aufs/aufs2-standalone.git;a=patch;h=624d0435b28be8bce48ea30cf00c52f4e5623621 (6) Add #include <linux/cache.h> to file ubuntu-oneiric/security/apparmor/sid.c because of this error : usr/src/linux-ti-omap4-3.0.0/security/apparmor/sid.c: In function ‘aa_alloc_sid’: /usr/src/linux-ti-omap4-3.0.0/security/apparmor/sid.c:42:2: error: ‘sid_lock’ undeclared (first use in this function) (7) fakeroot debian/rules editconfigs I left everything default except: # Kernel Features -> Preemption Model -> Fully Preemptible Kernel (RT) # Kernel hacking -> Kernel Debugging = n # System type -> TI Omap Common Feature -> Use 32KHz timer =n (8) I apply your patch you provided for high resolution timer and also applied this patch from http://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg49148.html ( i am not sure the above patch needed or not, I attached the patch here) (9) fakeroot debian/rules clean skipabi=true skipmodule=true dpkg-buildpackage -B -uc -us (wait 2 hours) (10) sudo dpkg -i linux-headers-3.0.0-1201_3.0.0-1201.5_armel.deb sudo dpkg -i linux-headers-3.0.0-1201-omap4_3.0.0-1201.5_armel.deb sudo dpkg -i linux-image-3.0.0-1201-omap4_3.0.0-1201.5_armel.deb sudo flash-kernel 3.0.1-1201-omap4 After reboot, i have the realtime 3.0.1 omap4 running. The cyclictest shows an acceptable result, with no load the maximum latency is around 30usec, with load it is ~150usec. One good thing is I don;t have any problem when booting the new kernel. However, I have that problem when compile generic kernel and applied on minimal fs linux, instead of ubuntu, the same as you described, it only boots after 5-10 resets. The ubuntu kernel boots normally, but sometimes it hangs after boot, when i try to do run tasks, Firefox for example. ======================================================== I have a question about the minimal systems, it may be ridiculous but i don;t know how to get and run cyclictest, since I don;t have apt-get package, also no git. As I understand, I will have to compile it on pandaboard, but I found it hard to do it on the minimal fs. And second question, when you cross compile with make ARCH=arm CROSS_COMPILE=arm-angstrom-linux-gnueabi- uImage and get the uImage, your pandaboard is running Ubuntu or minimal fs ? Thank you very much for your support, it really helps me after 2 weeks of compilation again and again. Hung Bui
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