有买这个开发板的可以先刷breed-mt7621-newifi-d1的引导程序，原厂的bootload不怎么好用，而且不支持新板的lzma内核解压。

--- target/linux/ramips/dts/mt7621_hilink_hlk-7621a.dts
+++ target/linux/ramips/dts/mt7621_hilink_hlk-7621a.dts
@@ -1,14 +1,26 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
-/dts-v1/;
 
 #include "mt7621.dtsi"
 
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
 / {
     compatible = "hilink,hlk-7621a", "mediatek,mt7621-soc";
     model = "HiLink HLK-7621A";
 
     chosen {
-        bootargs = "console=ttyS0,57600";
+        bootargs = "console=ttyS0,115200";
+    };
+
+    keys {
+        compatible = "gpio-keys";
+
+        reset {
+            label = "reset";
+            gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+            linux,code = <KEY_RESTART>;
+        };
     };
 };
 
@@ -19,7 +31,8 @@
         compatible = "jedec,spi-nor";
         reg = <0>;
         spi-max-frequency = <44000000>;
-
+        broken-flash-reset;
+            
         partitions {
             compatible = "fixed-partitions";
             #address-cells = <1>;
@@ -53,51 +66,28 @@
 };
 
 &switch0 {
-    ports {
-        port@0 {
-            status = "okay";
-            label = "lan1";
-        };
-
-        port@1 {
-            status = "okay";
-            label = "lan2";
-        };
-
-        port@2 {
-            status = "okay";
-            label = "lan3";
-        };
-
-        port@3 {
-            status = "okay";
-            label = "lan4";
-        };
-
-        port@4 {
-            status = "okay";
-            label = "wan";
-        };
-    };
+    /* must delete compatible property */
+    /delete-property/ compatible;
 };
 
 &gmac0 {
-    mtd-mac-address = <&factory 0x8004>;
+    nvmem-cells = <&macaddr_factory_e000>;
+    nvmem-cell-names = "mac-address";
 };
 
 &state_default {
     gpio {
-        groups = "rgmii2", "jtag";
+        groups = "jtag", "uart", "wdt";
         function = "gpio";
     };
 };
 
 &uartlite2 {
-    status = "okay";
+    status = "disable";
 };
 
 &uartlite3 {
-    status = "okay";
+    status = "disable";
 };
 
 &xhci {
@@ -105,9 +95,80 @@
 };
 
 &sdhci {
-    status = "okay";
+    status = "disable";
 };
 
 &i2c {
-    status = "okay";
+    status = "disable";
+};
+
+&gmac1 {
+    nvmem-cells = <&macaddr_factory_e006>;
+    nvmem-cell-names = "mac-address";
+};
+
+&hnat {
+        mtketh-wan = "eth1";
+        mtketh-ppd = "eth0";
+        mtketh-lan = "eth0";
+    ext-devices = "radio0","radio1","radio2";
+        mtketh-max-gmac = <2>;
+        status = "okay";
+};
+
+&gsw {
+    mediatek,mdio = <&mdio>;
+    mediatek,portmap = "llllw";
+    mediatek,mcm;
+    mt7530,direct-phy-access;
+
+    resets = <&rstctrl 2>;
+    reset-names = "mcm";
+
+    port5: port@5 {
+        compatible = "mediatek,mt753x-port";
+        reg = <5>;
+        phy-mode = "rgmii";
+        fixed-link {
+            speed = <1000>;
+            full-duplex;
+        };
+    };
+
+    port6: port@6 {
+        compatible = "mediatek,mt753x-port";
+        reg = <6>;
+        phy-mode = "rgmii";
+        fixed-link {
+            speed = <1000>;
+            full-duplex;
+        };
+    };
+
+    mdio-bus {
+        #address-cells = <1>;
+        #size-cells = <0>;
+    };
+};
+
+&factory {
+    compatible = "nvmem-cells";
+    #address-cells = <1>;
+    #size-cells = <1>;
+
+    macaddr_factory_e000: macaddr@e000 {
+        reg = <0xe000 0x6>;
+    };
+
+    macaddr_factory_e006: macaddr@e006 {
+        reg = <0xe006 0x6>;
+    };
+};
+
+&pcie {
+    status = "okay";
+};
+
+&uartlite {
+    status = "okay";
 };

--- target/linux/ramips/mt7621/base-files/etc/board.d/02_network
+++ target/linux/ramips/mt7621/base-files/etc/board.d/02_network
@@ -54,6 +54,7 @@
         ucidef_add_switch "switch0" \
             "0:lan:4" "1:lan:3" "2:lan:2" "3:lan:1" "4:wan:5" "6@eth0"
         ;;
+    hilink,hlk-7621a|\
     gehua,ghl-r-001)
         ucidef_add_switch "switch0" \
             "0:lan" "1:lan" "2:lan" "4:wan" "6u@eth0" "5u@eth1"

--- target/linux/ramips/image/mt7621.mk
+++ target/linux/ramips/image/mt7621.mk
@@ -778,10 +778,14 @@
 TARGET_DEVICES += hatlab_gateboard-one
 
 define Device/hilink_hlk-7621a
+  $(Device/dsa-migration)
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 32448k
   DEVICE_VENDOR := HiLink
   DEVICE_MODEL := HLK-7621A
-  DEVICE_PACKAGES := kmod-usb3
+  SUPPORTED_DEVICES += hlk-7621a
+  DEVICE_COMPAT_VERSION := 1.1
+  DEVICE_PACKAGES := kmod-usb3 
 endef
 TARGET_DEVICES += hilink_hlk-7621a
 
--- target/linux/ramips/Makefile
+++ target/linux/ramips/Makefile
@@ -10,8 +10,8 @@
 SUBTARGETS:=mt7620 mt7621 mt76x8 rt288x rt305x rt3883
 FEATURES:=squashfs gpio boot-part rootfs-part
 
-KERNEL_PATCHVER:=5.4
-KERNEL_TESTING_PATCHVER:=5.10
+KERNEL_PATCHVER:=5.10
+KERNEL_TESTING_PATCHVER:=5.15
 
 define Target/Description
     Build firmware images for Ralink RT288x/RT3xxx based boards.

补丁文件下载：12_fix_hlk-7621.zip