diff --git a/README.md b/README.md
index 67015898b4..5dd769ecf1 100755
--- a/README.md
+++ b/README.md
@@ -146,7 +146,8 @@ For previous versions, please read:
 
 ## V3 changes
 
-* v3.0, 2020-01-21, For [#1547][bug #1547], support setting cc/cxx/ar tools. 3.0.103
+* v3.0, 2020-01-21, Fix [#1547][bug #1547], support crossbuild for ARM/MIPS.
+* v3.0, 2020-01-21, For [#1547][bug #1547], support setting cc/cxx/ar/ld/randlib tools. 3.0.103
 * v3.0, 2020-01-19, For [#1580][bug #1580], fix cid range problem. 3.0.102
 * v3.0, 2020-01-19, For [#1070][bug #1070], define FLV CodecID for [AV1][bug #1070] and [opus][bug #307]. 3.0.101
 * v3.0, 2020-01-16, For [#1575][bug #1575], correct RTMP redirect as tcUrl, add redirect2 as RTMP URL. 3.0.100
diff --git a/trunk/auto/auto_headers.sh b/trunk/auto/auto_headers.sh
index 10b2afb778..87720b8401 100755
--- a/trunk/auto/auto_headers.sh
+++ b/trunk/auto/auto_headers.sh
@@ -132,6 +132,11 @@ if [ $SRS_LOG_TRACE = YES ]; then
 else
     srs_undefine_macro "SRS_AUTO_TRACE" $SRS_AUTO_HEADERS_H
 fi
+if [ $SRS_CROSS_BUILD = YES ]; then
+    srs_define_macro "SRS_AUTO_CROSSBUILD" $SRS_AUTO_HEADERS_H
+else
+    srs_undefine_macro "SRS_AUTO_CROSSBUILD" $SRS_AUTO_HEADERS_H
+fi
 
 # prefix
 echo "" >> $SRS_AUTO_HEADERS_H
diff --git a/trunk/auto/depends.sh b/trunk/auto/depends.sh
index b252cccac0..1dd9841ec6 100755
--- a/trunk/auto/depends.sh
+++ b/trunk/auto/depends.sh
@@ -232,7 +232,8 @@ if [ $SRS_EXPORT_LIBRTMP_PROJECT = NO ]; then
         (
             rm -rf ${SRS_OBJS}/st-srs && cd ${SRS_OBJS} &&
             ln -sf ../3rdparty/st-srs && cd st-srs &&
-            make clean && make ${_ST_MAKE} EXTRA_CFLAGS="${_ST_EXTRA_CFLAGS}" &&
+            make clean && make ${_ST_MAKE} EXTRA_CFLAGS="${_ST_EXTRA_CFLAGS}" \
+                CC=${SRS_TOOL_CC} AR=${SRS_TOOL_AR} LD=${SRS_TOOL_LD} RANDLIB=${SRS_TOOL_RANDLIB} &&
             cd .. && rm -f st && ln -sf st-srs/obj st
         )
     fi
@@ -321,38 +322,43 @@ fi
 #####################################################################################
 # openssl, for rtmp complex handshake
 #####################################################################################
-# extra configure options
-OPENSSL_HOTFIX="-DOPENSSL_NO_HEARTBEATS"
+if [[ $SRS_SSL == YES && $SRS_USE_SYS_SSL == YES ]]; then
+    echo "Warning: Use system libssl, without compiling openssl."
+fi
 # @see http://www.openssl.org/news/secadv/20140407.txt
 # Affected users should upgrade to OpenSSL 1.1.0e. Users unable to immediately
 # upgrade can alternatively recompile OpenSSL with -DOPENSSL_NO_HEARTBEATS.
-if [ $SRS_SSL = YES ]; then
-    if [[ -f /usr/local/lib64/libssl.a && ! -f ${SRS_OBJS}/openssl/lib/libssl.a ]]; then
-        (mkdir -p  ${SRS_OBJS}/openssl/lib && cd ${SRS_OBJS}/openssl/lib && 
-            ln -sf /usr/local/lib64/libssl.a && ln -sf /usr/local/lib64/libcrypto.a)
-        (mkdir -p ${SRS_OBJS}/openssl/include && cd ${SRS_OBJS}/openssl/include &&
-            ln -sf /usr/local/include/openssl)
-    fi
-    if [ $SRS_USE_SYS_SSL = YES ]; then
-        echo "Warning: Use system libssl, without compiling openssl."
+if [[ $SRS_SSL == YES && $SRS_USE_SYS_SSL != YES ]]; then
+    OPENSSL_HOTFIX="-DOPENSSL_NO_HEARTBEATS"
+    OPENSSL_CONFIG="./config"
+    # https://stackoverflow.com/questions/15539062/cross-compiling-of-openssl-for-linux-arm-v5te-linux-gnueabi-toolchain
+    if [[ $SRS_CROSS_BUILD == YES ]]; then
+        OPENSSL_CONFIG="./Configure linux-armv4"
     else
-        # cross build not specified, if exists flag, need to rebuild for no-arm platform.
-        if [[ -f ${SRS_OBJS}/openssl/lib/libssl.a ]]; then
-            echo "Openssl-1.1.0e is ok.";
-        else
-            echo "Building openssl-1.1.0e.";
-            (
-                rm -rf ${SRS_OBJS}/openssl-1.1.0e && cd ${SRS_OBJS} &&
-                unzip -q ../3rdparty/openssl-1.1.0e.zip && cd openssl-1.1.0e &&
-                ./config --prefix=`pwd`/_release -no-shared no-threads $OPENSSL_HOTFIX &&
-                make && make install_sw &&
-                cd .. && rm -rf openssl && ln -sf openssl-1.1.0e/_release openssl
-            )
+        # If not crossbuild, try to use exists libraries.
+        if [[ -f /usr/local/lib64/libssl.a && ! -f ${SRS_OBJS}/openssl/lib/libssl.a ]]; then
+            (mkdir -p  ${SRS_OBJS}/openssl/lib && cd ${SRS_OBJS}/openssl/lib &&
+                ln -sf /usr/local/lib64/libssl.a && ln -sf /usr/local/lib64/libcrypto.a)
+            (mkdir -p ${SRS_OBJS}/openssl/include && cd ${SRS_OBJS}/openssl/include &&
+                ln -sf /usr/local/include/openssl)
         fi
-        # check status
-        ret=$?; if [[ $ret -ne 0 ]]; then echo "Build openssl-1.1.0e failed, ret=$ret"; exit $ret; fi
-        if [ ! -f ${SRS_OBJS}/openssl/lib/libssl.a ]; then echo "Build openssl-1.1.0e failed."; exit -1; fi
     fi
+    # cross build not specified, if exists flag, need to rebuild for no-arm platform.
+    if [[ -f ${SRS_OBJS}/openssl/lib/libssl.a ]]; then
+        echo "Openssl-1.1.0e is ok.";
+    else
+        echo "Building openssl-1.1.0e.";
+        (
+            rm -rf ${SRS_OBJS}/openssl-1.1.0e && cd ${SRS_OBJS} &&
+            unzip -q ../3rdparty/openssl-1.1.0e.zip && cd openssl-1.1.0e &&
+            ${OPENSSL_CONFIG} --prefix=`pwd`/_release -no-shared -no-threads -no-asm $OPENSSL_HOTFIX &&
+            make CC=${SRS_TOOL_CC} AR="${SRS_TOOL_AR} -rs" LD=${SRS_TOOL_LD} RANDLIB=${SRS_TOOL_RANDLIB} && make install_sw &&
+            cd .. && rm -rf openssl && ln -sf openssl-1.1.0e/_release openssl
+        )
+    fi
+    # check status
+    ret=$?; if [[ $ret -ne 0 ]]; then echo "Build openssl-1.1.0e failed, ret=$ret"; exit $ret; fi
+    if [ ! -f ${SRS_OBJS}/openssl/lib/libssl.a ]; then echo "Build openssl-1.1.0e failed."; exit -1; fi
 fi
 
 #####################################################################################
@@ -447,4 +453,3 @@ fi
 # generated the test script
 #####################################################################################
 rm -rf ${SRS_OBJS}/srs.test && ln -sf `pwd`/scripts/srs.test objs/srs.test
-
diff --git a/trunk/auto/options.sh b/trunk/auto/options.sh
index 7dd1ae0af6..4bc2ffc15e 100755
--- a/trunk/auto/options.sh
+++ b/trunk/auto/options.sh
@@ -100,6 +100,8 @@ SRS_CROSS_BUILD=NO
 SRS_TOOL_CC=gcc
 SRS_TOOL_CXX=g++
 SRS_TOOL_AR=ar
+SRS_TOOL_LD=ld
+SRS_TOOL_RANDLIB=randlib
 SRS_EXTRA_FLAGS=
 
 #####################################################################################
@@ -164,6 +166,8 @@ Toolchain options:          @see https://github.com/ossrs/srs/issues/1547#issuec
   --cc=<CC>                 Use c compiler CC, default is gcc.
   --cxx=<CXX>               Use c++ compiler CXX, default is g++.
   --ar=<AR>                 Use archive tool AR, default is ar.
+  --ld=<LD>                 Use linker tool LD, default is ld.
+  --randlib=<RANDLIB>       Use randlib tool RANDLIB, default is randlib.
   --extra-flags=<EFLAGS>    Set EFLAGS as CFLAGS and CXXFLAGS. Also passed to ST as EXTRA_CFLAGS.
 
 Conflicts:
@@ -249,6 +253,8 @@ function parse_user_option() {
         --cc)                           SRS_TOOL_CC=${value}        ;;
         --cxx)                          SRS_TOOL_CXX=${value}       ;;
         --ar)                           SRS_TOOL_AR=${value}        ;;
+        --ld)                           SRS_TOOL_LD=${value}        ;;
+        --randlib)                      SRS_TOOL_RANDLIB=${value}   ;;
         --extra-flags)                  SRS_EXTRA_FLAGS=${value}    ;;
 
         --x86-x64)                      SRS_X86_X64=YES             ;;
@@ -420,6 +426,14 @@ function apply_user_presets() {
         SRS_UTEST=NO
         SRS_STATIC=NO
     fi
+
+    # if crossbuild, disable research and librtmp.
+    if [[ $SRS_CROSS_BUILD == YES ]]; then
+        SRS_LIBRTMP=NO
+        SRS_RESEARCH=NO
+        SRS_UTEST=NO
+        SRS_STATIC=NO
+    fi
 }
 apply_user_presets
 
@@ -520,6 +534,8 @@ SRS_AUTO_CONFIGURE="--prefix=${SRS_PREFIX}"
     if [[ $SRS_TOOL_CC != '' ]]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --cc=$SRS_TOOL_CC"; fi
     if [[ $SRS_TOOL_CXX != '' ]]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --cxx=$SRS_TOOL_CXX"; fi
     if [[ $SRS_TOOL_AR != '' ]]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --ar=$SRS_TOOL_AR"; fi
+    if [[ $SRS_TOOL_LD != '' ]]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --ld=$SRS_TOOL_LD"; fi
+    if [[ $SRS_TOOL_RANDLIB != '' ]]; then SRS_AUTO_CONFIGURE="${SRS_AUTO_CONFIGURE} --randlib=$SRS_TOOL_RANDLIB"; fi
     echo "User config: $SRS_AUTO_USER_CONFIGURE"
     echo "Detail config: ${SRS_AUTO_CONFIGURE}"
 }
@@ -541,6 +557,14 @@ function check_option_conflicts() {
         echo "No arhive tool"
         exit -1
     fi
+    if [[ $SRS_TOOL_LD == '' ]]; then
+        echo "No linker tool"
+        exit -1
+    fi
+    if [[ $SRS_TOOL_RANDLIB == '' ]]; then
+        echo "No randlib tool"
+        exit -1
+    fi
 
     if [ $SRS_OSX = YES ]; then
         echo "We don't support OSX, please use docker https://github.com/ossrs/srs-docker"
diff --git a/trunk/src/main/srs_main_server.cpp b/trunk/src/main/srs_main_server.cpp
index 85e3f193dd..2141ddab53 100644
--- a/trunk/src/main/srs_main_server.cpp
+++ b/trunk/src/main/srs_main_server.cpp
@@ -251,6 +251,9 @@ void show_macro_features()
 #if defined(__aarch64__)
         ss << " aarch64";
 #endif
+#if defined(SRS_AUTO_CROSSBUILD)
+        ss << "(crossbuild)";
+#endif
         
         ss << ", conf:" << _srs_config->config() << ", limit:" << _srs_config->get_max_connections()
         << ", writev:" << sysconf(_SC_IOV_MAX) << ", encoding:" << (srs_is_little_endian()? "little-endian":"big-endian")
diff --git a/trunk/src/service/srs_service_st.cpp b/trunk/src/service/srs_service_st.cpp
index 6cd04ba93b..d8d9c3892c 100644
--- a/trunk/src/service/srs_service_st.cpp
+++ b/trunk/src/service/srs_service_st.cpp
@@ -115,7 +115,12 @@ srs_error_t srs_fd_reuseport(int fd)
 #if defined(SO_REUSEPORT)
     int v = 1;
     if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(int)) == -1) {
-        return srs_error_new(ERROR_SOCKET_SETREUSEADDR, "SO_REUSEPORT fd=%v", fd);
+        #ifdef SRS_AUTO_CROSSBUILD
+            srs_warn("SO_REUSEPORT disabled for crossbuild");
+            return srs_success;
+        #else
+            return srs_error_new(ERROR_SOCKET_SETREUSEADDR, "SO_REUSEPORT fd=%v", fd);
+        #endif
     }
 #else
     #warning "SO_REUSEPORT is not supported by your OS"