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> Yes I did. It's documented on pages 56, 58 and 61 of Loongson 2F manual.
> The difference is in wider PFN and PageMask and presence of no-execute
> bit. If all unknown bit are zeroed it shouldn't be any problem. But it
> will be useful in future for sure.

I am not sure the NX bit is actually implemented in the 2F. It sounds
like a leftover of the 2E documentation, and unfortunately neither the
2E nor the 2F documentation mention what kind of exception is generated
at ITLB refill time when the TLB entry has the NX bit set.