I would believe this is because business reason :)
same DIE ,mask some function for different price

2015-01-18 12:47 GMT+08:00 Matthijs van Duin <matthijsvand...@gmail.com>:

> On Sunday, 18 January 2015 05:23:51 UTC+1, liyaoshi wrote:
>>
>> AM57x dont have EVE IP
>>
>
> Well, they *have* four EVEs, but they didn't pass the factory test and got
> disabled. If all EVEs did pass the test it would probably have ended up
> with "TDA2" stamped on its package. It two pass the tests (and both DSPs)
> it may end up a high-end DRA75x.  On the other hand, the DRA7xx however are
> apparently okay with one SGX-540 core being disabled, while that wouldn't
> be acceptable for an AM572x.
>
> This is how your rescue the yield of such a huge and complicated die.
>
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