[Xenomai] error in xenomai porting to new arm soc

[Xenomai] error in xenomai porting to new arm soc

[satya patel]

Hi,
>
>
>
> I am trying to port xenomai on an ARM A-9 based SOC (configured for
single core processor).
>
> I need to use Linux kernel version 10.3.31.
>
> Hence I patched Xenomai as below:
>
>
>
> Linux 10.3.31 (LTSI version) + ipipe-core-3.10.32-arm-6.patch +
xenomai-3.0-rc2.tar.bz2.
>
>
>
> 1.       Patching is successful. (few patching conflicts  are resolved
manually in files - irq-gic.c, arm_arch_timer.c, irqdesc.c.
>
> 2.       Merged code is compiled successfully in all the three
combinations:
>
> a.       CONFIG_IPIPE and XENOMAI disabled.
>
> b.      CONFIG_IPIPE Enabled and XENOMAI disabled.
>
> c.       CONFIG_IPIPE and XENOMAI Enabled.
>
> 3.       However kernel boots successfully only for the option “2.a”
above (i.e. CONFIG_IPIPE and XENOMAI disabled).
>
> Below error is observed in option “2.b”:
>
>
>
> Switching to clocksource ipipe_tsc
>
>
>
> INFO: rcu_preempt self-detected stall on CPU { 0}  (t=27486 jiffies
g=4294967038 c=4294967037 q=10)
>
>
>
> CPU: 0 PID: 1 Comm: swapper Not tainted 3.10.31-ltsi-20141215 #17
>
>
>
> [<c0013818>] (unwind_backtrace+0x0/0x138) from [<c0011ea8>]
(show_stack+0x10/0x14)
>
>
>
> 4.       Below changes are done apart from applying the ipipe patch:
>
> a.       Conflicts are resolved manually to keep latest ipipe code in
files irq-gic.c, arm_arch_timer.c, irqdesc.c.
>
> b.      Enabled “IPIPE_ARM_KUSER_TSC” for target SoC in KConfig file
>
> c.       Set CONFIG_UIDGID_STRICT_TYPE_CHECKS=n
>
> d.      Modified timer.c file for ipipe_timer and tsc as per below link:
>
>
https://xenomai.org/2014/09/porting-xenomai-dual-kernel-to-a-new-arm-soc/#config-multi-irq-handler
>
>
>
> Please let me know how to avoid the above warning to boot the kernel.
>
> Regards.
>
> Satya

Re: [Xenomai] error in xenomai porting to new arm soc

[Gilles Chanteperdrix]

On Mon, Feb 09, 2015 at 10:44:07AM +0530, satya patel wrote:
> Hi,
> >
> >
> >
> > I am trying to port xenomai on an ARM A-9 based SOC (configured for
> single core processor).
> >
> > I need to use Linux kernel version 10.3.31.

This kernel version does not exist yet, unless maybe if you are
using ftp over IPOT. The latest kernel version is 3.19


> >
> > Hence I patched Xenomai as below:
> >
> >
> >
> > Linux 10.3.31 (LTSI version) + ipipe-core-3.10.32-arm-6.patch +
> xenomai-3.0-rc2.tar.bz2.
> >
> >
> >
> > 1.       Patching is successful. (few patching conflicts  are resolved
> manually in files - irq-gic.c, arm_arch_timer.c, irqdesc.c.
> >
> > 2.       Merged code is compiled successfully in all the three
> combinations:
> >
> > a.       CONFIG_IPIPE and XENOMAI disabled.
> >
> > b.      CONFIG_IPIPE Enabled and XENOMAI disabled.
> >
> > c.       CONFIG_IPIPE and XENOMAI Enabled.
> >
> > 3.       However kernel boots successfully only for the option “2.a”
> above (i.e. CONFIG_IPIPE and XENOMAI disabled).
> >
> > Below error is observed in option “2.b”:
> >
> >
> >
> > Switching to clocksource ipipe_tsc
> >
> >
> >
> > INFO: rcu_preempt self-detected stall on CPU { 0}  (t=27486 jiffies
> g=4294967038 c=4294967037 q=10)
> >
> >
> >
> > CPU: 0 PID: 1 Comm: swapper Not tainted 3.10.31-ltsi-20141215 #17
> >
> >
> >
> > [<c0013818>] (unwind_backtrace+0x0/0x138) from [<c0011ea8>]
> (show_stack+0x10/0x14)
> >
> >
> >
> > 4.       Below changes are done apart from applying the ipipe patch:
> >
> > a.       Conflicts are resolved manually to keep latest ipipe code in
> files irq-gic.c, arm_arch_timer.c, irqdesc.c.
> >
> > b.      Enabled “IPIPE_ARM_KUSER_TSC” for target SoC in KConfig file
> >
> > c.       Set CONFIG_UIDGID_STRICT_TYPE_CHECKS=n
> >
> > d.      Modified timer.c file for ipipe_timer and tsc as per below link:
> >
> >
> https://xenomai.org/2014/09/porting-xenomai-dual-kernel-to-a-new-arm-soc/#config-multi-irq-handler
> >
> >
> >
> > Please let me know how to avoid the above warning to boot the kernel.

Your tsc emulation probably has an issue.

-- 
					    Gilles.

Re: [Xenomai] error in xenomai porting to new arm soc

[Gilles Chanteperdrix]

On Mon, Feb 09, 2015 at 06:47:03PM +0530, satya patel wrote:
> Sorry it is kernel 3.10.31 version

It does not really matter. Please read my answer completely, do not
top post, and keep the conversation on the mailing list.

-- 
					    Gilles.