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

[Le Guan]

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.

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
>> >
>> >
>> >
>> >
>> ------------------------------------------------------------------------------
>> >
>> >
>> >
>> > _______________________________________________
>> > genode-main mailing list
>> > 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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