forked from Imagelibrary/rtems
3d3ad4dc1c
The first, mistake in buffer size computation for cache flush and invalidate has been corrected. GCC __attribute__( ( aligned( 64 ) ) ) should work and works for local variables. Code ensures right stack alignment. But attribute has to be moved to type declaration to ensure that structure size is affected by attribute. But even this seems to not work reliably for some reason. May it be, the stack area between frame start and end of local variable buffer accessed during context switch or some stack prefetch during resturn such way that some cache lines belonging to buffer are filled to cache. Extending buffer by one more cache line padding helps there. In the longer term perspective, buffer should be moved to some static area or cache aligned dynamic memory allocated. Concurrent calls to the VideoCore operations and access serialization should be added too but problem is that some calls are required during workspace and MMU setup so variant without need of mutex would be required as well. Framebuffer setup code and other VideoCore calls check more precisely for errors and do not proceed forward with incorrect data now. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
This is the Real-Time Executive for Multiprocessing Systems (RTEMS). The version number for this software is indicated in the VERSION file. See the documentation manuals in doc/ with daily builds available online at http://rtems.org/onlinedocs/doc-current/share/rtems/html/ and released builds at http://www.rtems.org/onlinedocs/releases/ for information on building, installing, and using RTEMS. The INSTALL file tells you to come back here. See the RTEMS Wiki at http://devel.rtems.org for community knowledge and tutorials. RTEMS Doxygen available at http://www.rtems.org/onlinedocs/doxygen/cpukit/html The RTEMS Project maintains mailing lists which are used for most discussions: * For general-purpose questions related to using RTEMS, use the rtems-users ml: https://lists.rtems.org/mailman/listinfo/users * For questions and discussion related to development of RTEMS, use the rtems-devel ml: https://lists.rtems.org/mailman/listinfo/devel See https://devel.rtems.org/ to view existing or file a new issue report ticket.