On Fri, Jul 24, 2015 at 7:03 PM, Gedare Bloom <ged...@gwu.edu> wrote:
> On Fri, Jul 24, 2015 at 3:30 AM, Rohini Kulkarni <krohini1...@gmail.com> > wrote: > > On 24 Jul 2015 12:35, "Sebastian Huber" < > sebastian.hu...@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); > What are the values of bsp_section_bss_begin, and bsp_section_bss_size? > > Apparently, the memset is trying to write into the .text (code) > section, which is a very bad thing to do indeed. > > > (gdb) s > > memset (m=0x1157e0, c=0, n=64176) > These memset parameters indicate the start location bsp_section_bss_begin and size of bss section bsp_section_bss_size. > 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.hu...@embedded-brains.de > >> PGP : Public key available on request. > >> > >> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG. > >> > > > > _______________________________________________ > > devel mailing list > > devel@rtems.org > > http://lists.rtems.org/mailman/listinfo/devel > -- Rohini Kulkarni
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