Erros cross-compiling for MIPS

[Jeronimo Pellegrini]

Hello,

I am trying to get ECL to run on a  MIPS-based wireless router that 
runs OpenWRT. This one:

system type		: Qualcomm Atheros QCA956X ver 1 rev 0
machine			: TP-Link Archer C7 v4
processor		: 0
cpu model		: MIPS 74Kc V5.0
BogoMIPS		: 385.84
wait instruction	: yes
microsecond timers	: yes
tlb_entries		: 32
extra interrupt vector	: yes
hardware watchpoint	: yes, count: 4, address/irw mask: [0x0ffc,
0x0ffc, 0x0ffb, 0x0ffb]
isa			: mips1 mips2 mips32r1 mips32r2
ASEs implemented	: mips16 dsp dsp2
Options implemented	: tlb 4kex 4k_cache prefetch mcheck ejtag llsc
dc_aliases perf_cntr_intr_bit cdmm nan_legacy nan_2008 contextconfig
perf
shadow register sets	: 1


OpenWRT has a framework for building packages; almost everything is
in one Makefile and possibly patches, but the system takes care of
whatever is needed to cross compile, usually.

So, I have tried creating an ECL package, and, well, it complained I
was cross-compiling :-)  and told me that I should fill in a cross_config 
file. So I did (the only change was to choose ECL_BIGENDIAN=yes):

ECL_STACK_DIR=down
CL_FIXNUM_TYPE=int
CL_FIXNUM_BITS=32
CL_FIXNUM_MAX=536870911L
CL_FIXNUM_MIN=-536870912L
CL_INT_BITS=32
CL_LONG_BITS=32
ECL_BIGENDIAN=yes
ECL_NEWLINE=LF
ECL_FILE_CNT=0
ECL_STDINT_HEADER="#include <stdint.h>"
ECL_UINT8_T=uint8_t
ECL_UINT16_T=uint16_t
ECL_UINT32_T=uint32_t
ECL_UINT64_T=no
ECL_INT8_T=int8_t
ECL_INT16_T=int16_t
ECL_INT32_T=int32_t
ECL_INT64_T=no
ECL_LONG_LONG_BITS=no
ECL_WORKING_ENVIRON=yes
ECL_TO_RUN=/usr/local/bin/ecl

Then, when compiling, I got the error below. It seems that I probably got something wrong
in the cross_config file (is that correct?)

Does it look like something easy/obvious to fix?
Is the output of the configure script necessary?

Thank you!
Jeronimo

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.
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Making all in src
make[6]: Entering directory '/home/jeronimo/pkg/openwrt/build_dir/target-mips_24kc_musl/ecl-16.1.3/build/atomic/src'
make[7]: Entering directory '/home/jeronimo/pkg/openwrt/build_dir/target-mips_24kc_musl/ecl-16.1.3/build/atomic/src' libtool: compile:  mips-openwrt-linux-musl-gcc -DHAVE_CONFIG_H -I../src -I/home/jeronimo/pkg/openwrt/build_dir/target-mips_24kc_musl/ecl-16.1.3/src/bdwgc/libatomic_ops/src -I/home/jeronimo/pkg/openwrt/staging_dir/target-mips_24kc_musl/usr/include -I/home/jeronimo/pkg/openwrt/staging_dir/target-mips_24kc_musl/include -I/home/jeronimo/pkg/openwrt/staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl/usr/include -I/home/jeronimo/pkg/openwrt/staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl/include/fortify -I/home/jeronimo/pkg/openwrt/staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl/include -fPIC -Wall -Wextra -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -Os -pipe -mno-branch-likely -mips32r2 -mtune=24kc -fno-caller-saves -fno-plt -fhonour-copts -Wno-error=unused-but-set-variable -Wno-error=unused-result -msoft-float -mips16 -minterlink-mips16 -iremap/home/jeronimo/pkg/openwrt/build_dir/target-mips_24kc_musl/ecl-16.1.3:ecl-16.1.3 -Wformat -Werror=format-security -fstack-protector -D_FORTIFY_SOURCE=1
-Wl,-z,now -Wl,-z,relro -I/home/jeronimo/pkg/openwrt/staging_dir/target-mips_24kc_musl/usr/include/ -fPIC -D_THREAD_SAFE -MT atomic_ops.lo -MD -MP -MF .deps/atomic_ops.Tpo -c /home/jeronimo/pkg/openwrt/build_dir/target-mips_24kc_musl/ecl-16.1.3/src/bdwgc/libatomic_ops/src/atomic_ops.c -fPIC -DPIC -o atomic_ops.o
{standard input}: Assembler messages:
{standard input}:24: Error: opcode not supported on this processor: mips2 (mips2) `sync '
{standard input}:47: Error: opcode not supported on this processor: mips2 (mips2) `ll $2,0($4)'
{standard input}:49: Error: opcode not supported on this processor: mips2 (mips2) `sc $5,0($4)'
make[7]: *** [Makefile:597: atomic_ops.lo] Error 1
make[7]: Leaving directory '/home/jeronimo/pkg/openwrt/build_dir/target-mips_24kc_musl/ecl-16.1.3/build/atomic/src'
make[6]: *** [Makefile:460: all] Error 2