Kernel Initialization iMx6

[chirag garg]

On Fri, Jul 25, 2014 at 2:29 PM, Stefan Kalkowski <
stefan.kalkowski at ...1...> wrote:

> Hi Chirag,
>
> On 07/25/2014 08:47 AM, chirag garg wrote:
> > Hi Stefan,
> >
> > We tried to further to debug call to call as you mentioned . And we find
> > out that the call for *pic( ) in *kernel.cc is reaching to the Grand
> parent
> > Arm_gic :: Pic constructor.
> >
> > In constructor _distr ( distr_base), _cpu ( cpu_base) are getting
> > initialized, which is working fine. And whenever  functions of _distr and
> > _cpu objects are being called, it's got stuck. like in the initialization
> > part *_distr.max_interrupt( ) *is not working.
> >
> > The same thing is working in Genode version 13.11 but not in 14.05.
> >
> > Can you suggest some thing to debug this problem ??
>
> ok, I assume the root cause of your problem is that the I/O memory
> mapped registers of the PIC are not inserted into the page-tables of the
> kernel/core. All I/O memory regions used by the kernel/core have to be
> returned by the function "Platform::_core_only_mmio_regions" normally
> defined within the "platform_services.cc" file of your board. At least
> the PIC, Timer, and UART I/O memory mapped registers need to be listed
> there, so that the kernel initialization code adds them to its
> page-tables before turning the MMU on.
>
> If the kernel raises a pagefault during its initialization, after taking
> the "data_lock()" in "init_kernel_multiprocessor", it will try to take
> that lock again when entering the kernel code again through the
> exception vector. Thereby it hangs in the already locked lock. The
> kernel, and core aren't allowed to page-fault at all.
>
> Regards
> Stefan
>
> Thanks a lot Stefan.
We are able to Initialize the kernel. Now it is giving the same error as
starting one for which you recommended the debug patch.

starting Kernel...
> Genode 14.05
>
> Kernel Initialized
> int main( ) : --- create local services---
> PF in core thread ( core ) : ip=1003cc3c fault=1008
> failed to communicate with thread event

Regards,
Chirag

> >
> >
> >
> > Regards
> >
> > Chirag Garg
> > IIT Madras , Rise Lab
> >
> >
> >
> >
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>
> --
> Stefan Kalkowski
> Genode Labs
>
> http://www.genode-labs.com/ · http://genode.org/
>
>
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