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<div class="moz-cite-prefix">Hey Bob,<br>
<br>
The changes you're talking about originate from this issue:
<a 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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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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type="cite">
<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>
<blockquote type="cite">
<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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