[t2] Difference between mips & mips64 architecture selections

[Jan Rovins]

Hi,
I am setting up for some experimental builds for a 64 bit Mips processor,
I see that there are options for 64bit processors in both the mips & 
mips64 architecture options.

The mips selection lists options like these:
       mips64          "MIPS Instruction Set Architecture 64Bit" \
       r6000           "MIPS r6000 processor" \
       r8000           "MIPS r8000 processor" \
   
The mips64 lists these options
      generic "No special optimisation"       \
       r5000   "Build for R5000 CPU"           \
       r6000   "Build for R6000 CPU"           \
       r8000   "Build for R8000 CPU"

Question 1:
are the mips->mips64 and the mips64->generic options equivalent?
are the mips->r6000 and the mips64->r6000 options equivalent?
are the mips->r8000 and the mips64->r8000 options equivalent?
if not, how are they different? (does the mips arch build 32-bit code 
that runs on the 64 bit processors?)

Question 2: If they are equivalent, is  one preferred over the other?

Question3:
The Mips universe offers 3 different abi's  n32,o32, and n64.  is there 
a way to specify the abi in ones project? or by specifying multilib, do 
we automatically get both the n32 & n64 abi libs built?


Thanks,
Jan



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