disable DCache on RTEMS SMP

[Sebastian Huber]

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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