diff --git a/doc/devices/Hasivo-S1100P-8GT-1SX-S.md b/doc/devices/Hasivo-S1100P-8GT-1SX-S.md
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+# Hasivo S1100P-8GT-1SX-S
+
+RTL8373N switch with 8 × 2.5G RJ45 ports and 1 × SFP port. GD25Q16 2 MiB flash.
+
+## Port mapping
+
+| Front port | ASIC MAC | Interface |
+| --- | --- | --- |
+| 1–8 | 0–7 | RJ45 |
+| 9 | 8 | SFP (SDS1) |
+
+## Board signals
+
+| Function | GPIO |
+| --- | --- |
+| SFP detect | 38 |
+| SFP LOS | 37 |
+| SFP TX disable | Not connected (`GPIO_NA`) |
+| SFP I2C SDA / SCL | 39 / 40 |
+| Reset | 54 |
+
+PoE is managed by an RTL8238B and a separate STC8H8K64U controller, not directly by the RTL8373N. RTLPlayground does not control PoE on this board.
+
+## Build
+
+`make MACHINE=HASIVO_S1100P_8GT_1SX_S CI=1`
+
+## Photos
+
+Front panel:
+
+![Front panel](photos/Hasivo-S1100P-8GT-1SX-S/front.jpg)
+
+PCB top:
+
+![PCB top](photos/Hasivo-S1100P-8GT-1SX-S/pcb_top.jpg)
+
+PCB bottom:
+
+![PCB bottom](photos/Hasivo-S1100P-8GT-1SX-S/pcb_bottom.jpg)
+
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diff --git a/machine/HASIVO_S1100P_8GT_1SX_S.c b/machine/HASIVO_S1100P_8GT_1SX_S.c
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+#include "machine_defs.h"
+
+__code const struct machine machine = {
+	.machine_name = MACHINE_MODEL,
+	.isRTL8373 = 1,
+	.mac_flash_offset = 0x1FC000,
+	.min_port = 0,
+	.max_port = 8,
+	.n_sfp = 1,
+	.log_to_phys_port = {1, 2, 3, 4, 5, 6, 7, 8, 9},
+	.phys_to_log_port = {0, 1, 2, 3, 4, 5, 6, 7, 8},
+	.is_sfp = {0, 0, 0, 0, 0, 0, 0, 0, 1},
+	.sfp_port[0].pin_detect = GPIO38,
+	.sfp_port[0].pin_los = GPIO37,
+	.sfp_port[0].pin_tx_disable = GPIO_NA,
+	.sfp_port[0].sds = 1,
+	.sfp_port[0].i2c = I2CBUS( GPIO39_I2C_SDA4, GPIO40_I2C_SCL3_MDC1 ),
+	.reset_pin = GPIO54_ACL_BIT2_EN,
+	.high_leds = { .mux = LED_27 | LED_28_SYS | LED_29, .enable = LED_28_SYS | LED_29 },
+	.port_led_set = {0, 0, 0, 0, 0, 0, 0, 0, 1},
+	.led_sets = {
+		{
+			LEDS_1G | LEDS_100M | LEDS_10M | LEDS_LINK | LEDS_ACT, // LED0: orange
+			0,
+			LEDS_2G5 | LEDS_LINK | LEDS_ACT, // LED2: green
+			0
+		},
+		{
+			LEDS_10G | LEDS_5G | LEDS_2G5 | LEDS_1G | LEDS_100M | LEDS_LINK | LEDS_ACT, // SFP LED0: green (both SFP LEDs are green)
+			0, 0, 0
+		}
+	},
+	.led_mux_custom = 1,
+	.led_mux = {
+		0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x09,
+		0x0e, 0x10, 0x12, 0x0e, 0x14, 0x11, 0x12, 0x16,
+		0x15, 0x16, 0x18, 0x19, 0x1a, 0x1a, 0x1d, 0x1e,
+		0x1c, 0x1e, 0x20, 0x21
+	},
+};
diff --git a/machine/HASIVO_S1100P_8GT_1SX_S.h b/machine/HASIVO_S1100P_8GT_1SX_S.h
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+++ b/machine/HASIVO_S1100P_8GT_1SX_S.h
@@ -0,0 +1,6 @@
+#ifndef _MACHINE_HASIVO_S1100P_8GT_1SX_S_H_
+#define _MACHINE_HASIVO_S1100P_8GT_1SX_S_H_
+
+#define MACHINE_MODEL "Hasivo S1100P-8GT-1SX-S"
+
+#endif