[genode] base-hw: page-fault error on I.MX6

[Stefan Kalkowski]

Hello Le Guan,

On 09/29/2015 11:18 PM, Le Guan wrote:
> Hi Stefan,
> I think I have found the problem.
> In the file repos/base-hw/src/core/spec/arm_v7/mode_transition.s,  the
> assembly "msr spsr, r0" is alway compiled to "msr spsr_cf, r0", which
> leaves [23:8] untouched. This include the E bit. Whereas the used chip
> seems has a  random spsr  left in SVC mode after power on.
> I have patched the instruction to "msr spsr_cxfs, r0". Now the system runs
> well.
> Hope this helps.
> 

Cool, thank you very much for discovering that shortcoming! We'll fix
that bug soon.

Regards
Stefan

> Thanks.
> Regards,
> Le Guan
> 
> On Tue, Sep 29, 2015 at 1:00 PM, Le Guan <guanle.ustc at ...9...> wrote:
> 
>> Hi Stefan,
>> Thanks for your kind reply. My board is I.MX6 SABRE platform for smard
>> devices. I modified the RAM0_SIZE to 0x40000000 according to the board
>> reference manual. In addition, I used the building system for hw_wand_quad.
>> Is there anything wrong? I also add RUN_OPT = --include boot_dir/hw
>> --include image/uboot to the etc/build.conf in the build directory. The
>> used bootloader is the Freescale's default U-boot.
>>
>> The used run script is the unmodified run/printf, which is like this,
>>
>> build "core init test/printf"
>>
>> create_boot_directory
>>
>> install_config {
>>     <config>
>>         <parent-provides>
>>             <service name="LOG"/>
>>             <service name="RM"/>
>>         </parent-provides>
>>         <default-route>
>>             <any-service> <parent/> </any-service>
>>         </default-route>
>>         <start name="test-printf">
>>             <resource name="RAM" quantum="10M"/>
>>         </start>
>>     </config>
>> }
>>
>> build_boot_image "core init test-printf"
>>
>> append qemu_args "-nographic -m 64"
>>
>> run_genode_until {-1 = -1 = -1} 10
>>
>> puts "Test succeeded"
>>
>> The used branch is the official 15.08 master branch (
>> https://github.com/genodelabs/genode/tree/15.08).
>>
>> Hope the information helps!
>> Thanks a lot!
>> Regards,
>> Le Guan
>>
>>
>> On Tue, Sep 29, 2015 at 2:32 AM, Stefan Kalkowski <
>> stefan.kalkowski at ...1...> wrote:
>>
>>> Hi,
>>>
>>> On 09/28/2015 05:24 PM, Le Guan wrote:
>>>> Hello everyone,
>>>> I ran the lastest base-hw on my i.MX6 SABRE, but found that the program
>>>> crashes randomly, because of page faults. The output is like this:
>>>> "Pagefault in core thread (core): ip=1001903c fault=70159530"
>>>>
>>>> I later figured out that this is because the E bit of the CSPR register
>>> is
>>>> randomly changed to 1 when switching to the user mode, but the memory is
>>>> arranged in LE. This causes the LDR instruction to load a wrong
>>> address. Do
>>>> anyone know why does this happen and how to solve it?
>>>>
>>>
>>> Well, that sounds really strange. I'm wondering that you experience such
>>> problems. We test i.MX6 using the Wandboard all nights without those
>>> errors. Can you provide a branch to us including a run-script that
>>> triggers this problem?
>>>
>>> Regards
>>> Stefan
>>>
>>>> Thanks in advance!
>>>> Best,
>>>> Le Guan
>>>>
>>>>
>>>>
>>>>
>>> ------------------------------------------------------------------------------
>>>>
>>>>
>>>>
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>>>> genode-main at lists.sourceforge.net
>>>> https://lists.sourceforge.net/lists/listinfo/genode-main
>>>>
>>>
>>> --
>>> Stefan Kalkowski
>>> Genode Labs
>>>
>>> http://www.genode-labs.com/ · http://genode.org/
>>>
>>>
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>>
>>
> 
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-- 
Stefan Kalkowski
Genode Labs

http://www.genode-labs.com/ · http://genode.org/