[PATCH] GSoC: Cache configurations Raspberry Pi 2 support

[Rohini Kulkarni]

On 24 Jul 2015 12:35, "Sebastian Huber" <sebastian.huber at embedded-brains.de>
wrote:

>
>
> On 23/07/15 23:24, Rohini Kulkarni wrote:
>
>> I could finally get back to this issue. I used Pi 1 for debugging, but
>> the reason for this problem will apply to Pi 2 also.
>> With text section set to ARMV7_MMU_CODE_CACHED ( which implies read only)
>> , a data abort exception occurs with memset() inside bsp_start_clear_bss()
>> function. An illegal write access to an address according to me.
>>
>
> Which exception and which address? Something is not working here.
>

This is a part of the debugging output. When I used ARMV7_MMU_CODE_CACHED.
(gdb) s
bsp_start_clear_bss ()
    at ../../../../../.././raspberrypi/lib/include/bsp/start.h:126
126      memset(bsp_section_bss_begin, 0, (size_t) bsp_section_bss_size);
(gdb) s
memset (m=0x1157e0, c=0, n=64176)
    at ../../../../../gcc-4.9.2/newlib/libc/string/memset.c:59
59    ../../../../../gcc-4.9.2/newlib/libc/string/memset.c: No such file or
directory.
(gdb) s
49    in ../../../../../gcc-4.9.2/newlib/libc/string/memset.c
(gdb) s
_ARMV4_Exception_data_abort_default ()
    at
../../../../../../../../rtems-local/rtems/c/src/../../cpukit/score/cpu/arm/armv4-exception-default.S:71
71        sub    sp, #MORE_CONTEXT_SIZE

When I set text section flag to ARMV7_MMU_READ_WRITE, the system starts
successfully.

>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-brains.de
> PGP     : Public key available on request.
>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.rtems.org/pipermail/devel/attachments/20150724/bb44a716/attachment-0002.html>