Keep track of mips related issues.

diff --git a/target-mips/TODO b/target-mips/TODO
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+Unsolved issues/bugs in the mips/mipsel backend
+-----------------------------------------------
+
+- MIPS64:
+  - No 64bit TLB support
+  - no 64bit wide registers for FPU
+  - 64bit mul/div handling broken
+  - DM[FT]C not implemented
+
+- TLB fails cornercase at address wrap around
+- [ls][dw][lr] report broken (aligned) BadVAddr
+- Missing per-CPU instruction decoding, currently all implemented
+  instructions are regarded as valid
+- pcnet32 does not work for little endian emulation on big endian host
+  (probably not mips specific, but observable for mips-malta)
+
+- We fake firmware support instead of doing the real thing