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I found that changing to O32 ABI gets rid of the sdc1 et al. I believe the N32 ABI is defined for 64-bit floating point registers, so the quickest way to a working Linux 2.6 could well be O32.

Trying to catch up to you guys... Using crossdev -t mips64r5900el-unknown-linux-uclibc fails when building gcc 4.2.0 with an internal error in the assembler. Looking closer, gcc emits the 'sdc1' instruction when compiling libgcc2, but we don't have that instruction on the EE. I believe there is some...