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<div class="moz-cite-prefix">Oops, looked like I stomped on the
closing brace in the Namespace Arm declaration in
.../core/processor_driver/arm.h during a merge. Not sure why the
compiler didn't catch that, but the core library now builds. I've
one issue with an application module which I'll fix tomorrow then
get to test the kernel start up again.<br>
<br>
Thanks,<br>
Bob<br>
<br>
<br>
On 08/17/2014 04:51 PM, Bob Stewart wrote:<br>
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<div class="moz-cite-prefix">Yes, Martin, I did a make clean after
the pull. Still looking as to why the Arm namespace shows up
above Genode. Let you when I find it.<br>
<br>
Bob<br>
<br>
On 08/17/2014 03:27 PM, Martin Stein wrote:<br>
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<div class="moz-cite-prefix">Btw. hope you have done 'make
clean' after your Makefile changes. Otherwise this could cause
the build system to act strange.<br>
<br>
On 17.08.2014 21:16, Martin Stein wrote:<br>
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<div class="moz-cite-prefix">Hi Bob,<br>
Looks like there's a problem with the name spaces. Instead
of being comprised by 'Arm', 'Genode' should be a top-level
name space as well as 'Kernel'. I think it would be a good
idea to investigate why the 'Arm' prefix is active at all at
'double_list.h:95'.<br>
<br>
Martin<br>
<br>
On 17.08.2014 18:57, Bob Stewart wrote:<br>
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<div class="moz-cite-prefix">Hi Martin,<br>
Been out-of-town for the past few days.<br>
<br>
I understand the changes due to issue 1199 and I did
create the core library make file (in
base-hw/lib/mk/platform_bbb) for the platform I'm working
with before I left. Everything built ok until it got to <i>cpu_session_component.c</i>
in the core library build section where multiple errors
occurred. The following error would indicate I'm missing
something fundamental:<br>
<br>
In file included from
/Work/Genode/genode-14.05/repos/base-hw/src/core/kernel/scheduler.h:19:0,<br>
from
/Work/Genode/genode-14.05/repos/base-hw/src/core/kernel/processor.h:21,<br>
from
/Work/Genode/genode-14.05/repos/base-hw/src/core/kernel/thread.h:21,<br>
from
/Work/Genode/genode-14.05/repos/base-hw/src/core/include/platform_thread.h:29,<br>
from
/Work/Genode/genode-14.05/repos/base/src/core/include/cpu_session_component.h:27,<br>
from
/Work/Genode/genode-14.05/repos/base/src/core/cpu_session_component.cc:21:<br>
/Work/Genode/genode-14.05/repos/base-hw/src/core/kernel/double_list.h:
In member function ���void
Arm::Kernel::Double_list<T>::insert_tail(Arm::Kernel::Double_list<T>::Item*)���:<br>
/Work/Genode/genode-14.05/repos/base-hw/src/core/kernel/double_list.h:95:4:
error: ���printf��� is not a member of ���Arm::Genode���<br>
<br>
<br>
Regarding the page fault in the ROM fs initialization, I
did not isolate the route cause -- it appeared to be
getting a low address of 0x1000 and try to create a
translation table entry with that. I thought I saw some
changes in the ROM area in the pull, so I was going to get
a clean build and then try again.<br>
<br>
Bob<br>
<br>
<br>
On 08/13/2014 05:12 AM, Martin Stein wrote:<br>
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<div class="moz-cite-prefix">Hey Bob,<br>
<br>
The changes you're talking about originate from this
issue: <a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="https://github.com/genodelabs/genode/issues/1199">https://github.com/genodelabs/genode/issues/1199</a>.
Core now consists of a generic
'base-hw/src/core/target.mk' that solely defines the
target name and a dependency to the library 'core'. All
the other content that core is composed of resides in
the variant 'core.mk' and 'core.inc' library-description
files within 'base-hw/lib/mk' and its sub-directories
(respectively 'core-*.mk' and 'core-*.inc' for libraries
that are additions to the core library).<br>
At the one hand these changes reduce redundancy and LOC
count as hardware-specifics were split up more
fine-grained when transfered into libraries, at the
other hand we unified the scheme of handling orthogonal
specifiers (see for example the core-trustzone* files
that provide optional trustzone support for different
platform specifiers). Apart from that, the commits
didn't change that much regarding the substance of core.<br>
I hope this short insight helps you applying your
changes to the current state. If you have further
questions on this don't hesitate to ask.<br>
<br>
Regarding the page fault: Does that mean that you were
able to fix the fault?<br>
<br>
Cheers<br>
Martin<br>
<br>
On 12.08.2014 23:41, Bob Stewart wrote:<br>
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<div class="moz-cite-prefix">Martin,<br>
Have not been able to build with the pull from the
master branch. Looks like there are changes to base-hw
build that I've not seen before. The platform
target.mk file now appear in a repos//base-hw/lib/mk/
directory as core.mk. Is there documentation on the
changes? I searched the git repository but couldn't
find any.<br>
<br>
<br>
The mmu faulting address was coming from the creation
of Rom_modules in the ROM fs.<br>
<br>
Thanks,<br>
Bob<br>
<br>
On 08/11/2014 09:03 AM, Bob Stewart wrote:<br>
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<div class="moz-cite-prefix"><br>
Thanks for the quick reply, Martin.<br>
<br>
I'll pull the current master branch tomorrow and let
you know if it fixes my issue.<br>
<br>
Thanks for the debugging tip on core faults. <br>
My core-only mmio regions are the same as they were
in 14.02 and unless the handling of the region has
changed I should have the correct translation table
entries. My PDBG output from the _mmu_exception
method was:<br>
<br>
<i>void Kernel::Thread::_mmu_exception(): f_addr
0x1008 f_writes 0x1 f_pd 0x813d6004 f_signal 0x0
label core</i><i><br>
</i><br>
Looks like I've a problem with the fault address, so
I'll keep digging to see where that is coming from.<br>
<br>
Thanks,<br>
Bob<br>
On 08/11/2014 07:54 AM, Martin Stein wrote:<br>
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<pre wrap="">Hi Bob,
On 09.08.2014 22:21, Bob Stewart wrote:
</pre>
<blockquote type="cite">
<pre wrap="">I went back to the 14.05 issues today and found I could get the kernel
initialization to complete successfully if I reverted the S bit to
"unshared" in the memory attributes in a Section entry create. Prior to
14.05 this bit was set to "unshared" and was presumably changed in 14.05
to allow for multiple processors accessing the same memory regions.
</pre>
</blockquote>
<pre wrap="">We had an issue (<a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://github.com/genodelabs/genode/issues/1181">https://github.com/genodelabs/genode/issues/1181</a>)
recently that the shared-bit should be set only when using SMP. The
related changes are in the current state of our master branch
(<a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://github.com/genodelabs/genode/tree/master">https://github.com/genodelabs/genode/tree/master</a>) but not in version
14.05. Could you please give it a try?
</pre>
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<pre wrap="">In addition, after completing kernel initialization, core's "main"
function is entered, the info message for creating local services shows
up, a translation for the top of RAM (0x80000000) is created, then the
message "failed to communicate thread event" occurs and init is never
called. Any thoughts on why that message is appearing would be
appreciated. It appears to be coming from initialization of the root
interfaces.
</pre>
</blockquote>
<pre wrap="">This seems to be a page fault in core. Normally core should never
trigger a page fault because there's no one to handle it. So the kernel
doesn't know who to inform about it and thus prints this message. To
prevent this situation, memory regions statically needed by core
(program image, MMIO regions) get mapped 1:1 in the 'Core_pd'
constructor in 'base-hw/src/core/kernel/kernel.cc' using, among others,
the platform specific method 'Platform::_core_only_mmio_regions'. I
assume that your port misses a region in this function. You can get
further information about the page fault by printing things like
'_fault_addr', '_fault_writes', 'char const * Thread::label()', and
'unsigned long Thread::ip' in the method 'Thread::_mmu_exception()' in
'base-hw/src/core/arm/cpu_support.cc' right before '_fault.submit()'.
Cheers
Martin
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