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) > 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 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel