diff --git a/Makefile b/Makefile
index 2d314a7..6c64c53 100644
--- a/Makefile
+++ b/Makefile
@@ -272,7 +272,8 @@ comfast_cf-e520n \
 comfast_cf-e530n:
    @$(call build,64,1,ETH_CONFIG=_s27)

-d-link_dir-505_a1:
+d-link_dir-505_a1 \
+zsun_sd100:
    @$(call build,64,1)

 dragino_ms14:
diff --git a/u-boot/Makefile b/u-boot/Makefile
index 1c02897..e4a8fcc 100644
--- a/u-boot/Makefile
+++ b/u-boot/Makefile
@@ -852,6 +852,11 @@ zbtlink_zbt-we1526: qca953x_common
    @$(call define_add,CFG_ATH_GMAC_NMACS,2)
    @$(MKCONFIG) -a ap143 mips mips ap143 ar7240 ar7240

+zsun_sd100: ar933x_common
+   @$(call config_init,Zsun SD100,sd100,16,22,0,QCA_AR9331_SOC)
+   @$(call define_add,CONFIG_FOR_ZSUN_SD100,1)
+   @$(MKCONFIG) -a ap121 mips mips ap121 ar7240 ar7240
+
 # =============
 # CLEAN TARGETS
 # =============
diff --git a/u-boot/include/configs/ap121.h b/u-boot/include/configs/ap121.h
index fac001f..8dc3a01 100644
--- a/u-boot/include/configs/ap121.h
+++ b/u-boot/include/configs/ap121.h
@@ -156,6 +156,11 @@

    #define CONFIG_QCA_GPIO_MASK_LED_ACT_L  GPIO27

+#elif defined(CONFIG_FOR_ZSUN_SD100)
+   #define CONFIG_QCA_GPIO_MASK_LED_ACT_H  GPIO0
+   #define CONFIG_QCA_GPIO_MASK_OUT_INIT_H GPIO18
+   #define CONFIG_QCA_GPIO_MASK_OUT_INIT_L GPIO21
+
 #endif

 /*
@@ -243,6 +248,12 @@
                "rootfstype=squashfs init=/sbin/init "\
                "mtdparts=ar7240-nor0:128k(u-boot),64k(u-boot-env),16128k(firmware),64k(art)"

+#elif defined(CONFIG_FOR_ZSUN_SD100)
+
+   #define CONFIG_BOOTARGS "console=ttyATH0,115200 root=31:04 "\
+               "rootfstype=squashfs,jffs2 noinitrd "\
+               "mtdparts=spi0.0:64k(u-boot)ro,64k(u-boot-env)ro,16128k(firmware),64k(nvram)ro,64k(art)ro"
+
 #endif

 /*
@@ -330,6 +341,11 @@
    #define CFG_ENV_SIZE        0x8000
    #define CFG_ENV_SECT_SIZE   0x10000

+#elif defined(CONFIG_FOR_ZSUN_SD100)
+
+   #define CFG_ENV_ADDR        0x9F010000
+   #define CFG_ENV_SIZE        0x10000
+
 #else

    #define CFG_ENV_ADDR        0x9F01EC00
@@ -359,7 +375,8 @@
     defined(CONFIG_FOR_ALFA_NETWORK_TUBE2H)    ||\
     defined(CONFIG_FOR_CREATCOMM_D3321)        ||\
     defined(CONFIG_FOR_DRAGINO_MS14)           ||\
-    defined(CONFIG_FOR_VILLAGE_TELCO_MP2)
+    defined(CONFIG_FOR_VILLAGE_TELCO_MP2)      ||\
+    defined(CONFIG_FOR_ZSUN_SD100)

    #define OFFSET_MAC_DATA_BLOCK       0xFF0000
    #define OFFSET_MAC_DATA_BLOCK_LENGTH    0x010000
@@ -427,7 +444,8 @@
     !defined(CONFIG_FOR_HAK5_PACKET_SQUIRREL)        &&\
     !defined(CONFIG_FOR_HAK5_WIFI_PINEAPPLE_NANO)    &&\
     !defined(CONFIG_FOR_UNWIRED_DEVICES_UNWIRED_ONE) &&\
-    !defined(CONFIG_FOR_VILLAGE_TELCO_MP2)
+    !defined(CONFIG_FOR_VILLAGE_TELCO_MP2)           &&\
+    !defined(CONFIG_FOR_ZSUN_SD100)

    #define OFFSET_ROUTER_MODEL 0xFD00

@@ -481,6 +499,35 @@

 #endif

+/* Zsun SD100 is limited to 64 KB only and has a custom recovery script */
+#if defined(CONFIG_FOR_ZSUN_SD100)
+
+   #undef CONFIG_CMD_HTTPD
+
+
+#endif
+
 /*
  * ===========================
  * HTTP recovery configuration
@@ -528,6 +575,10 @@

    #define WEBFAILSAFE_UPLOAD_LIMITED_AREA_IN_BYTES    (256 * 1024)

+#elif defined(CONFIG_FOR_ZSUN_SD100)
+
+   #define WEBFAILSAFE_UPLOAD_LIMITED_AREA_IN_BYTES    (256 * 1024)
+
 #else

    #define WEBFAILSAFE_UPLOAD_LIMITED_AREA_IN_BYTES    (256 * 1024)
@@ -587,7 +638,8 @@
     !defined(CONFIG_FOR_GLINET_GL_USB150)            &&\
     !defined(CONFIG_FOR_HAK5_WIFI_PINEAPPLE_NANO)    &&\
     !defined(CONFIG_FOR_UNWIRED_DEVICES_UNWIRED_ONE) &&\
-    !defined(CONFIG_FOR_VILLAGE_TELCO_MP2)
+    !defined(CONFIG_FOR_VILLAGE_TELCO_MP2)           &&\
+    !defined(CONFIG_FOR_ZSUN_SD100)

    #define CONFIG_UPG_SCRIPTS_UBOOT_SIZE_BCKP_HEX  0x20000

diff --git a/u-boot/include/env_scripts.h b/u-boot/include/env_scripts.h
index ddd0232..06049a9 100644
--- a/u-boot/include/env_scripts.h
+++ b/u-boot/include/env_scripts.h
@@ -140,7 +140,8 @@
        "elif itest $cnt < 5; then "
    #endif

-   #define CONFIG_ENV_BTN_RECOVERY_SCRIPT  \
+   #if !defined(CONFIG_ENV_BTN_RECOVERY_SCRIPT)
+       #define CONFIG_ENV_BTN_RECOVERY_SCRIPT  \
        "recovery=" \
        "if button; then " \
            "sleep 600;" \
@@ -182,6 +183,7 @@
            "fi;" \
            "setenv cnt;" \
        "fi\0"
+   #endif

 #endif /* CONFIG_BTN_RECOVERY_SCRIPT && CONFIG_GPIO_RESET_BTN */