Hello Stéphane,
the rtems_cache_disable_data() has no real use case. It is quite
difficult to implement and it is not unusual that its implementation is
broken. I think on RTEMS 6 it should work for this BSP. However, I am
not sure if the atomic operations work, if you disable the data cache.
Without atomic operations, you will have unpredictable behaviour in SMP
configurations.
You can statically place data in a non-cacheable area with a section
attribute:
#include <bsp/linker-symbols.h>
BSP_NOCACHE_SECTION char nocache[123];
Kind regards,
Sebastian
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