compiling u-boot, set arch when using CONFIG_CPU_TAROKO

davis@XPS-15-9570:~/uboot-2016.11$ . /opt/poky/mips32r2el/3.4.1/environment-setup-mips32r2el-nf-poky-linux
davis@XPS-15-9570:~/uboot-2016.11$ export CROSS_COMPILE=mipsel-poky-linux-
davis@XPS-15-9570:~/uboot-2016.11$ export ARCH=mips
davis@XPS-15-9570:~/uboot-2016.11$ cp ~/Downloads/uboot_2016.11_rts3916n_defconfig .config
davis@XPS-15-9570:~/uboot-2016.11$ make oldconfig
scripts/kconfig/conf  --oldconfig Kconfig
#
# configuration written to .config
#
davis@XPS-15-9570:~/uboot-2016.11$ git diff -no-pager
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index efe7e44..0c0f0c2 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -29,6 +29,7 @@ arch-$(CONFIG_CPU_MIPS32_R6) += -march=mips32r6 -Wa,-mips32r6
 arch-$(CONFIG_CPU_MIPS64_R1) += -march=mips64 -Wa,-mips64
 arch-$(CONFIG_CPU_MIPS64_R2) += -march=mips64r2 -Wa,-mips64r2
 arch-$(CONFIG_CPU_MIPS64_R6) += -march=mips64r6 -Wa,-mips64r6
+arch-$(CONFIG_CPU_TAROKO)    += -march=mips2 -Wa,-mips2

 # Allow extra optimization for specific CPUs/SoCs
 tune-$(CONFIG_MIPS_TUNE_4KC) += -mtune=4kc
davis@XPS-15-9570:~/uboot-2016.11$ make
scripts/kconfig/conf  --silentoldconfig Kconfig
#
# configuration written to .config
#
boot.S
boot.lds
ddr3_dq16.bin
ddr3_dq32.bin
dma_copy.c
generate.sh
init.S
init.lds
makefile_boot
makefile_raminit
in uboot
in nor
rootfs_idx:  3
hconf_idx:  1
userdata_idx:  4
global 0x1000000 0x10000
boot 0 6 0
hconf 6 4 0
kernel 10 36 0
rootfs 46 160 0
userdata 206 50 0
  CHK     include/config.h
  UPD     include/config.h
  CFG     u-boot.cfg
  GEN     include/autoconf.mk
  GEN     include/autoconf.mk.dep
  CHK     include/config/uboot.release
  UPD     include/config/uboot.release
  CHK     include/generated/version_autogenerated.h
  UPD     include/generated/version_autogenerated.h
  CHK     include/generated/timestamp_autogenerated.h
  UPD     include/generated/timestamp_autogenerated.h
  CC      lib/asm-offsets.s
  CHK     include/generated/generic-asm-offsets.h
  UPD     include/generated/generic-asm-offsets.h
  HOSTCC  tools/envcrc.o
  WRAP    tools/lib/crc32.c
  HOSTCC  tools/lib/crc32.o
  WRAP    tools/common/env_embedded.c
  HOSTCC  tools/common/env_embedded.o
  WRAP    tools/lib/sha1.c
  HOSTCC  tools/lib/sha1.o
  HOSTLD  tools/envcrc
  HOSTCC  tools/gen_eth_addr
  HOSTCC  tools/mkenvimage.o
  HOSTCC  tools/os_support.o
  HOSTLD  tools/mkenvimage
  HOSTCC  tools/aisimage.o
  HOSTCC  tools/atmelimage.o
  WRAP    tools/common/bootm.c
  HOSTCC  tools/common/bootm.o
  HOSTCC  tools/default_image.o
  WRAP    tools/lib/fdtdec_common.c
  HOSTCC  tools/lib/fdtdec_common.o
  WRAP    tools/lib/fdtdec.c
  HOSTCC  tools/lib/fdtdec.o
  HOSTCC  tools/fit_common.o
  HOSTCC  tools/fit_image.o
  WRAP    tools/common/image-fit.c
  HOSTCC  tools/common/image-fit.o
  HOSTCC  tools/image-host.o
tools/image-host.c: In function ‘fit_image_write_sig’:
tools/image-host.c:134:13: warning: passing argument 1 of ‘imagetool_get_source_date’ from incompatible pointer type [enabled by default]
             time(NULL));
             ^
In file included from tools/mkimage.h:23:0,
                 from tools/image-host.c:12:
tools/imagetool.h:223:8: note: expected ‘struct image_tool_params *’ but argument is of type ‘const char *’
 time_t imagetool_get_source_date(
        ^
  WRAP    tools/common/image.c
  HOSTCC  tools/common/image.o
  HOSTCC  tools/imagetool.o
  HOSTCC  tools/imximage.o
  HOSTCC  tools/kwbimage.o
  WRAP    tools/lib/md5.c
  HOSTCC  tools/lib/md5.o
  HOSTCC  tools/lpc32xximage.o
  HOSTCC  tools/mxsimage.o
  HOSTCC  tools/omapimage.o
  HOSTCC  tools/pblimage.o
  HOSTCC  tools/pbl_crc32.o
  HOSTCC  tools/vybridimage.o
  WRAP    tools/lib/rc4.c
  HOSTCC  tools/lib/rc4.o
  HOSTCC  tools/rkcommon.o
  HOSTCC  tools/rkimage.o
  HOSTCC  tools/rksd.o
  HOSTCC  tools/rkspi.o
  HOSTCC  tools/socfpgaimage.o
  WRAP    tools/lib/sha256.c
  HOSTCC  tools/lib/sha256.o
  WRAP    tools/common/hash.c
  HOSTCC  tools/common/hash.o
  HOSTCC  tools/ublimage.o
  HOSTCC  tools/zynqimage.o
  HOSTCC  tools/zynqmpimage.o
  WRAP    tools/lib/libfdt/fdt.c
  HOSTCC  tools/lib/libfdt/fdt.o
  WRAP    tools/lib/libfdt/fdt_ro.c
  HOSTCC  tools/lib/libfdt/fdt_ro.o
  WRAP    tools/lib/libfdt/fdt_rw.c
  HOSTCC  tools/lib/libfdt/fdt_rw.o
  WRAP    tools/lib/libfdt/fdt_strerror.c
  HOSTCC  tools/lib/libfdt/fdt_strerror.o
  WRAP    tools/lib/libfdt/fdt_wip.c
  HOSTCC  tools/lib/libfdt/fdt_wip.o
  WRAP    tools/lib/libfdt/fdt_region.c
  HOSTCC  tools/lib/libfdt/fdt_region.o
  WRAP    tools/lib/libfdt/fdt_sw.c
  HOSTCC  tools/lib/libfdt/fdt_sw.o
  HOSTCC  tools/gpimage.o
  HOSTCC  tools/gpimage-common.o
  HOSTCC  tools/dumpimage.o
  HOSTLD  tools/dumpimage
  HOSTCC  tools/mkimage.o
  HOSTLD  tools/mkimage
  HOSTCC  tools/proftool
  HOSTCC  tools/fdtgrep.o
  HOSTLD  tools/fdtgrep
  CC      arch/mips/cpu/time.o
  CC      arch/mips/cpu/interrupts.o
  CC      arch/mips/cpu/cpu.o
  LD      arch/mips/cpu/built-in.o
  AS      arch/mips/cpu/start.o
  CC      arch/mips/lib/cache.o
{standard input}: Assembler messages:
{standard input}:98: Error: opcode not supported on this processor: mips2 (mips2) `cache 21,0($2)'
{standard input}:114: Error: opcode not supported on this processor: mips2 (mips2) `cache 16,0($2)'
{standard input}:203: Error: opcode not supported on this processor: mips2 (mips2) `cache 21,0($4)'
{standard input}:290: Error: opcode not supported on this processor: mips2 (mips2) `cache 17,0($4)'
make[1]: *** [arch/mips/lib/cache.o] Error 1
make: *** [arch/mips/lib] Error 2
davis@XPS-15-9570:~/uboot-2016.11$