Realtek RTS3904N SoC ffmpeg cross compilation

Hi All,
I have a platform (based on SoC RTS3904N), for which I am trying to compile FFMPEG with toolchain(rsdk-4.8.5-5281-EL-3.10-u0.9.33-m32fut-161202) which I received with SDK, getting the error that opcode not supported on the processor. 5281 (mips1).

Please help me to find out how can I compile the ffmpeg for the platform.

Error:

make: *** [ffbuild/common.mak:81: libavcodec/aacsbr.o] Error 1
/tmp/ccFOgqFB.s: Assembler messages:
/tmp/ccFOgqFB.s:19253: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f0,$3($17)' /tmp/ccFOgqFB.s:19254: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f1,$5($17)'
/tmp/ccFOgqFB.s:19438: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f3,$15($17)' /tmp/ccFOgqFB.s:19439: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f4,$3($17)'
/tmp/ccFOgqFB.s:19440: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f5,$5($17)' /tmp/ccFOgqFB.s:19441: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f6,$7($17)'
/tmp/ccFOgqFB.s:19635: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f1,$3($17)' /tmp/ccFOgqFB.s:19636: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f2,$5($17)'
/tmp/ccFOgqFB.s:19637: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f3,$7($17)' /tmp/ccFOgqFB.s:19638: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f4,$8($17)'
/tmp/ccFOgqFB.s:19835: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f2,$4($17)' /tmp/ccFOgqFB.s:19836: Error: opcode not supported on this processor: 5281 (mips1) lwxc1 $f3,$6($17)'
make: *** [ffbuild/common.mak:81: libavcodec/aacdec.o] Error 1

This is not a platform supported by OpenWrt. Please contact the party who provided you with the SDK for support.