Cache_disable on the C64p family...

Mike Geppert

Expert 1980 points

Other Parts Discussed in Thread: OMAP-L138

When trying to disable the caches on the DSP, Cache_disable(Cache_Type_All) asserts. Acording to the comments in the code, its not allowed on the L2.

So how do you shut down the L2?

The way the code is written, Cache_disable(Cache_Type_L1) is not allowed and I believe it should be?

Thanks

over 11 years ago

0 Emmanuel Trinidad - Alicea over 11 years ago

TI__Genius 10260 points

Hi Mike,

What version of SYS/BIOS are you currently using? Additionally, what device are you using for development?

Thanks,

-- Emmanuel

0 Mike Geppert over 11 years ago in reply to Emmanuel Trinidad - Alicea

Expert 1980 points

Sorry about that:

OMAP-L138

SYS/BIOS: 6.34.02.18

0 Emmanuel Trinidad - Alicea over 11 years ago in reply to Mike Geppert

TI__Genius 10260 points

Hi Mike,

After looking into the code and it seems like the Cache_Type_ALL parameter has no effect (on the C64x). The function is structured such that it will only disable Cache L1P and L1D if they are specified individually. If you want to disable the L1 Cache, the following should be used:

Cache_disable(Cache_Type_L1P);
Cache_disable(Cache_Type_L1D);

As you previously mentioned, the Cache_disable function cannot be used to disable L2 Cache. If interested, the Cache_setMar function with the value parameter set to Cache_Mar_DISABLE would do the trick:

Cache_setMar(byteAddr, byteSize, Cache_Mar_DISABLE);

Thanks,

-- Emmanuel

0 Mike Geppert over 11 years ago in reply to Emmanuel Trinidad - Alicea

Expert 1980 points

Thanks!

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Cache_disable on the C64p family...