diff --git a/Makefile b/Makefile
index ec66eb6..301f4f0 100644
--- a/Makefile
+++ b/Makefile
@@ -53,6 +53,7 @@ create_build_dir:
 # Keep machine.c in first position to fail immediately on invalid $MACHINE value
 SRCS = \
 	machine.c \
+	machine_init.c \
 	cmd_editor.c \
 	cmd_parser.c \
 	dhcp.c \
@@ -142,6 +143,7 @@ machine_check:
 	do \
 	echo "Checking $${MACHINE}"; \
 	$(CC) $(CC_FLAGS) -DMACHINE_$${MACHINE} -MMD -o $(BUILDDIR)/tmp/machine_check -c machine.c; \
+	$(CC) $(CC_FLAGS) -DMACHINE_$${MACHINE} -MMD -o $(BUILDDIR)/tmp/machine_check -c machine_init.c; \
 	done
 	@rm -rf $(BUILDDIR)/tmp
 
diff --git a/machine.c b/machine.c
index d7d4823..fcdb007 100644
--- a/machine.c
+++ b/machine.c
@@ -42,8 +42,6 @@ __code const struct machine machine = {
 		    },
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_KP_9000_6XH_X
 __code const struct machine machine = {
 	.machine_name = "keepLink KP-9000-6XH-X",
@@ -72,8 +70,6 @@ __code const struct machine machine = {
 		    },
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_KP_9000_6XH_X2
 __code const struct machine machine = {
 	.machine_name = "keepLink KP-9000-6XH-X2",
@@ -122,10 +118,6 @@ __code const struct machine machine = {
 		},
 	};
 
-void machine_custom_init(void) {
-	reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
-}
-
 #elif defined MACHINE_KP_9000_9XH_X_EU
 __code const struct machine machine = {
 	.machine_name = "keepLink KP-9000-9XH-X-EU",
@@ -151,8 +143,6 @@ __code const struct machine machine = {
 		    },
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_KP_9000_9XHML_X_V2_2
 __code const struct machine machine = {
 	.machine_name = "keepLink KP-9000-9XHML-X V2.2",
@@ -204,8 +194,6 @@ __code const struct machine machine = {
 	},
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_KP_9000_9XHML_X_V3_1
 __code const struct machine machine = {
 	.machine_name = "keepLink KP-9000-9XHML-X V3.1",
@@ -241,8 +229,6 @@ __code const struct machine machine = {
 				0x1a, 0x19, 0x1d, 0x1e, 0x1c, 0x1d, 0x20, 0x21},
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_SWGT024_V2_0_MANAGED
 __code const struct machine machine = {
 	.machine_name = "SWGT024 V2.0 Managed",
@@ -284,8 +270,6 @@ __code const struct machine machine = {
 	},
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_SWGT024_V2_0_UNMANAGED
 __code const struct machine machine = {
 	.machine_name = "SWGT024 V2.0 Unmanaged",
@@ -327,8 +311,6 @@ __code const struct machine machine = {
 	},
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_SWTG018AS_A_V_2_0
 __code const struct machine machine = {
 	.machine_name = "SWTG018AS-A V2.0",
@@ -368,8 +350,6 @@ __code const struct machine machine = {
 		     0x1d, 0x20, 0x21 },
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_HG0402XG_V1_1
 __code const struct machine machine = {
 	.machine_name = "HG0402XG V1.1",
@@ -408,8 +388,6 @@ __code const struct machine machine = {
 		    },
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_SWTGW218AS
 
 __code const struct machine machine = {
@@ -443,8 +421,6 @@ __code const struct machine machine = {
 				},
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_PCB_SWTG018AS_V2_1_0 // Sold as Sodola SL902 / Horaco "SWTGW218AS"; the SWTGW218AS label also covers other PCBs with different SFP and LED wiring (see MACHINE_SWTGW218AS)
 
 __code const struct machine machine = {
@@ -487,44 +463,6 @@ __code const struct machine machine = {
 		     0x1d, 0x20, 0x21 },
 };
 
-// The LED-set encoding cannot express this board's bi-color SFP LED (green <= 2.5G,
-// blue at 10G), so program the LED register block with the values the stock firmware
-// uses. Runs after leds_setup() and overrides the values computed there.
-// The final entry routes the blue-LED pin to the LED controller via PIN_MUX_0;
-// as a GPIO (the default) no LED register can light it. PIN_MUX_1/2 stay
-// untouched so SFP detect (GPIO38) and i2c remain GPIOs.
-static __code const struct { uint16_t reg; uint32_t val; } custom_init_regs[] = {
-	{ 0x6520, 0x0023e430UL },   // LED_MODE
-	{ 0x6524, 0xff001400UL },   // LED3_0_SET3
-	{ 0x6528, 0x00100000UL },   // LED3_0_SET1
-	{ 0x652c, 0x007f013fUL },   // LED3_2_SET3
-	{ 0x6530, 0x02000400UL },   // LED1_0_SET3
-	{ 0x6534, 0x01400141UL },   // LED3_2_SET2
-	{ 0x6538, 0x01440170UL },   // LED1_0_SET2
-	{ 0x653c, 0x18000041UL },   // LED3_2_SET1
-	{ 0x6540, 0x01400155UL },   // LED1_0_SET1
-	{ 0x6544, 0x01411000UL },   // LED3_2_SET0
-	{ 0x6548, 0x01740141UL },   // LED1_0_SET0
-	{ 0x654c, 0x00010000UL },   // LED_PORT_SET_SEL
-	{ 0x65d8, 0x3ffb6dffUL },   // LED_GLB_ACTIVE
-	{ 0x65dc, 0x7f24977fUL },   // LED_GLB_IO_EN
-	{ 0x65e0, 0x08144040UL },   // LED_GLB_MUX_1
-	{ 0x65e4, 0x10349309UL },   // LED_GLB_MUX_2
-	{ 0x65e8, 0x12454391UL },   // LED_GLB_MUX_3
-	{ 0x65ec, 0x19616555UL },   // LED_GLB_MUX_4
-	{ 0x65f0, 0x1c79d65aUL },   // LED_GLB_MUX_5
-	{ 0x65f4, 0x0002181dUL },   // LED_GLB_MUX_6
-	{ 0x7f8c, 0x20db6880UL },   // PIN_MUX_0
-};
-
-void machine_custom_init(void) {
-	uint8_t i;
-	// REG_SET is a multi-statement macro without a do-while wrapper: braces required
-	for (i = 0; i < sizeof(custom_init_regs) / sizeof(custom_init_regs[0]); i++) {
-		REG_SET(custom_init_regs[i].reg, custom_init_regs[i].val);
-	}
-}
-
 #elif defined MACHINE_LIANGUO_ZX_SWTGW215AS // Has PCB branded PCB-SWTG115AS-V2.0 but is labeled and reports as a ZX-SWTGW215AS, seems to be identical to the "real" ZX-SWTGW215AS except for the LEDs
 __code const struct machine machine = {
 	.machine_name = "Lianguo ZX-SWTGW215AS",
@@ -557,8 +495,6 @@ __code const struct machine machine = {
 	.led_mux_custom = 0,
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_DEFAULT_8C_1SFP
 __code const struct machine machine = {
 	.machine_name = "8+1 SFP Port Switch",
@@ -584,8 +520,6 @@ __code const struct machine machine = {
 		    },
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_TRENDNET_TEG_S562
 __code const struct machine machine = {
 	.machine_name = "Trendnet TEG-S562",
@@ -625,8 +559,6 @@ __code const struct machine machine = {
 
 };
 
-void machine_custom_init(void) { }
-
 #elif defined(MACHINE_PCB_K0402WS_V3) || defined(MACHINE_HI_K0402WS)  // Sold as a variety of devices, see doc/
 __code const struct machine machine = {
 	.machine_name = "PCB-K0402WS-V3.0",
@@ -673,10 +605,6 @@ __code const struct machine machine = {
 		},
 	};
 
-void machine_custom_init(void) { 
-	reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
-}
-
 #elif defined MACHINE_K0501W_V2_0
 __code const struct machine machine = {
 	.machine_name = "K0501W V2.0",
@@ -711,8 +639,6 @@ __code const struct machine machine = {
 	 },
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_ZX310S_4T2XH
 __code const struct machine machine = {
 	.machine_name = "ZX310S-4T2XH",
@@ -756,8 +682,6 @@ __code const struct machine machine = {
 		    },
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_STEAMEMO_IG204_V1
 __code const struct machine machine = {
 	.machine_name = "Steamemo IG204 V1",
@@ -808,8 +732,6 @@ __code const struct machine machine = {
 	},
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_HI_K0801WS
 __code const struct machine machine = {
     .machine_name = "Hi-Source HI-k0801WS",
@@ -859,8 +781,6 @@ __code const struct machine machine = {
     },
 };
 
-void machine_custom_init(void) { }
-
 #elif defined MACHINE_FNS1200P
 __code const struct machine machine = {
     .machine_name = "FNS-1200P",
@@ -916,11 +836,6 @@ __code const struct machine machine = {
     },
 };
 
-void machine_custom_init(void)
-{
-    reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
-}
-
 
 #elif defined MACHINE_PCB_SWTG024AS_A_2_0_1
 __code const struct machine machine = {
@@ -970,14 +885,6 @@ __code const struct machine machine = {
             },
     };
 
-void machine_custom_init(void)
-{
-    reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
-    reg_bit_set(RTL837X_REG_LED_MODE, 17);
-    reg_bit_clear(RTL837X_REG_LED_MODE, 9);
-    reg_bit_clear(RTL837X_REG_LED_MODE, 7);
-}
-
 #elif defined MACHINE_SWTG024AS_A_2_0_1_5C_1SFP
 __code const struct machine machine = {
     .machine_name = "SWTG024AS-A-V2.0.1-5C-1SFP",
@@ -1021,25 +928,6 @@ __code const struct machine machine = {
             },
     };
 
-void machine_custom_init(void)
-{
-    uint16_t pval;
-
-    reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
-    reg_bit_set(RTL837X_REG_LED_MODE, 17);
-    reg_bit_clear(RTL837X_REG_LED_MODE, 9);
-    reg_bit_clear(RTL837X_REG_LED_MODE, 7);
-
-    // OEM firmware sets these companion SDS0 polarity bits for the RTL8221B.
-    sds_read(0, 0, 0);
-    pval = SFR_DATA_U16;
-    sds_write_v(0, 0, 0, pval | 0x100);
-
-    sds_read(0, 6, 2);
-    pval = SFR_DATA_U16;
-    sds_write_v(0, 6, 2, pval | 0x4000);
-}
-
 #elif defined MACHINE_SWTG024AS_V2_0
 __code const struct machine machine = {
     .machine_name = "SWTG024AS-V2.0",
@@ -1083,25 +971,6 @@ __code const struct machine machine = {
             },
     };
 
-void machine_custom_init(void)
-{
-    uint16_t pval;
-
-    reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
-    reg_bit_set(RTL837X_REG_LED_MODE, 17);
-    reg_bit_clear(RTL837X_REG_LED_MODE, 9);
-    reg_bit_clear(RTL837X_REG_LED_MODE, 7);
-
-    // OEM firmware sets these companion SDS0 polarity bits for the RTL8221B.
-    sds_read(0, 0, 0);
-    pval = SFR_DATA_U16;
-    sds_write_v(0, 0, 0, pval | 0x100);
-
-    sds_read(0, 6, 2);
-    pval = SFR_DATA_U16;
-    sds_write_v(0, 6, 2, pval | 0x4000);
-}
-
 #elif defined MACHINE_ZX310S_4T2XT
 __code const struct machine machine = {
 	.machine_name = "ZX310S_4T2XT",
@@ -1139,12 +1008,6 @@ __code const struct machine machine = {
 		    },
 };
 
-void machine_custom_init(void) {
-	// For this device, the reset value of RTL837X_PIN_MUX_0 is 0x30000000,
-	// which would disables all LEDS, enable them manually:
-	REG_SET(RTL837X_PIN_MUX_0, 0x30db68bf);
-}
-
 #elif defined MACHINE_FG_4GT_2SX_V2_0
 __code const struct machine machine = {
 	.machine_name = "FG-4GT-2SX_V2.0",
@@ -1211,10 +1074,6 @@ __code const struct machine machine = {
 		},
 	};
 
-void machine_custom_init(void) {
-	REG_SET(RTL837X_REG_LED_GLB_IO_EN, 0x7624155b);
-}
-
 #else
 	#error "Please select a machine type in machine.h"
 #endif
diff --git a/machine.h b/machine.h
index 29fe39f..ae467cb 100644
--- a/machine.h
+++ b/machine.h
@@ -95,6 +95,6 @@ typedef struct machine_runtime
 	uint8_t isN : 1;
 };
 
-void machine_custom_init(void);
+void machine_custom_init(void) __banked;
 
 #endif
diff --git a/machine_init.c b/machine_init.c
new file mode 100644
index 0000000..e5669ed
--- /dev/null
+++ b/machine_init.c
@@ -0,0 +1,139 @@
+/*
+ * Per-machine one-shot boot hooks, hosted in BANK2 so board-specific
+ * tables and code do not consume the common bank.
+ */
+#include <stdint.h>
+#include "machine.h"
+#include "rtl837x_pins.h"
+#include "rtl837x_leds.h"
+#include "rtl837x_sfr.h"
+#include "rtl837x_regs.h"
+#include "rtl837x_common.h"
+
+#pragma codeseg BANK2
+#pragma constseg BANK2
+
+#if defined MACHINE_KP_9000_6XH_X2
+void machine_custom_init(void) __banked
+{
+	reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
+}
+
+#elif defined MACHINE_PCB_SWTG018AS_V2_1_0
+// The LED-set encoding cannot express this board's bi-color SFP LED (green <= 2.5G,
+// blue at 10G), so program the LED register block with the values the stock firmware
+// uses. Runs after leds_setup() and overrides the values computed there.
+// The final entry routes the blue-LED pin to the LED controller via PIN_MUX_0;
+// as a GPIO (the default) no LED register can drive it. PIN_MUX_1/2 stay
+// untouched so SFP detect (GPIO38) and i2c remain GPIOs.
+static __code const struct { uint16_t reg; uint32_t val; } custom_init_regs[] = {
+	{ 0x6520, 0x0023e430UL },   // LED_MODE
+	{ 0x6524, 0xff001400UL },   // LED3_0_SET3
+	{ 0x6528, 0x00100000UL },   // LED3_0_SET1
+	{ 0x652c, 0x007f013fUL },   // LED3_2_SET3
+	{ 0x6530, 0x02000400UL },   // LED1_0_SET3
+	{ 0x6534, 0x01400141UL },   // LED3_2_SET2
+	{ 0x6538, 0x01440170UL },   // LED1_0_SET2
+	{ 0x653c, 0x18000041UL },   // LED3_2_SET1
+	{ 0x6540, 0x01400155UL },   // LED1_0_SET1
+	{ 0x6544, 0x01411000UL },   // LED3_2_SET0
+	{ 0x6548, 0x01740141UL },   // LED1_0_SET0
+	{ 0x654c, 0x00010000UL },   // LED_PORT_SET_SEL
+	{ 0x65d8, 0x3ffb6dffUL },   // LED_GLB_ACTIVE
+	{ 0x65dc, 0x7f24977fUL },   // LED_GLB_IO_EN
+	{ 0x65e0, 0x08144040UL },   // LED_GLB_MUX_1
+	{ 0x65e4, 0x10349309UL },   // LED_GLB_MUX_2
+	{ 0x65e8, 0x12454391UL },   // LED_GLB_MUX_3
+	{ 0x65ec, 0x19616555UL },   // LED_GLB_MUX_4
+	{ 0x65f0, 0x1c79d65aUL },   // LED_GLB_MUX_5
+	{ 0x65f4, 0x0002181dUL },   // LED_GLB_MUX_6
+	{ 0x7f8c, 0x20db6880UL },   // PIN_MUX_0
+};
+
+void machine_custom_init(void) __banked
+{
+	uint8_t i;
+	// REG_SET is a multi-statement macro without a do-while wrapper: braces required
+	for (i = 0; i < sizeof(custom_init_regs) / sizeof(custom_init_regs[0]); i++) {
+		REG_SET(custom_init_regs[i].reg, custom_init_regs[i].val);
+	}
+}
+
+#elif defined(MACHINE_PCB_K0402WS_V3) || defined(MACHINE_HI_K0402WS)
+void machine_custom_init(void) __banked
+{
+	reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
+}
+
+#elif defined MACHINE_FNS1200P
+void machine_custom_init(void) __banked
+{
+    reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
+}
+
+#elif defined MACHINE_PCB_SWTG024AS_A_2_0_1
+void machine_custom_init(void) __banked
+{
+    reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
+    reg_bit_set(RTL837X_REG_LED_MODE, 17);
+    reg_bit_clear(RTL837X_REG_LED_MODE, 9);
+    reg_bit_clear(RTL837X_REG_LED_MODE, 7);
+}
+
+#elif defined MACHINE_SWTG024AS_A_2_0_1_5C_1SFP
+void machine_custom_init(void) __banked
+{
+    uint16_t pval;
+
+    reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
+    reg_bit_set(RTL837X_REG_LED_MODE, 17);
+    reg_bit_clear(RTL837X_REG_LED_MODE, 9);
+    reg_bit_clear(RTL837X_REG_LED_MODE, 7);
+
+    // OEM firmware sets these companion SDS0 polarity bits for the RTL8221B.
+    sds_read(0, 0, 0);
+    pval = SFR_DATA_U16;
+    sds_write_v(0, 0, 0, pval | 0x100);
+
+    sds_read(0, 6, 2);
+    pval = SFR_DATA_U16;
+    sds_write_v(0, 6, 2, pval | 0x4000);
+}
+
+#elif defined MACHINE_SWTG024AS_V2_0
+void machine_custom_init(void) __banked
+{
+    uint16_t pval;
+
+    reg_bit_set(RTL837X_REG_LED_GLB_IO_EN, 6);
+    reg_bit_set(RTL837X_REG_LED_MODE, 17);
+    reg_bit_clear(RTL837X_REG_LED_MODE, 9);
+    reg_bit_clear(RTL837X_REG_LED_MODE, 7);
+
+    // OEM firmware sets these companion SDS0 polarity bits for the RTL8221B.
+    sds_read(0, 0, 0);
+    pval = SFR_DATA_U16;
+    sds_write_v(0, 0, 0, pval | 0x100);
+
+    sds_read(0, 6, 2);
+    pval = SFR_DATA_U16;
+    sds_write_v(0, 6, 2, pval | 0x4000);
+}
+
+#elif defined MACHINE_ZX310S_4T2XT
+void machine_custom_init(void) __banked
+{
+	// For this device, the reset value of RTL837X_PIN_MUX_0 is 0x30000000,
+	// which would disables all LEDS, enable them manually:
+	REG_SET(RTL837X_PIN_MUX_0, 0x30db68bf);
+}
+
+#elif defined MACHINE_FG_4GT_2SX_V2_0
+void machine_custom_init(void) __banked
+{
+	REG_SET(RTL837X_REG_LED_GLB_IO_EN, 0x7624155b);
+}
+
+#else
+void machine_custom_init(void) __banked { }
+#endif