diff --git a/doc/devices/PCB-K0402WS-V1.0.md b/doc/devices/PCB-K0402WS-V1.0.md
new file mode 100644
index 00000000..e732a20f
--- /dev/null
+++ b/doc/devices/PCB-K0402WS-V1.0.md
@@ -0,0 +1,72 @@
+# PCB-K0402WS-V1.0
+
+This is the first revision of the PCB-K0402WS series of boards; it's very similar to 2.0 in terms of layout/wiring.
+
+The board does have footprints for a VLAN modeswitch at the front and a second flash chip on the bottom of the PCB, but these have been seen to ship unpopulated.
+
+### Brands
+
+* YuanLey YS25-0402 Note: there are [multiple revisions](PCB-K0402WS-V3.0.md) of the YS25-0402. This first revision lacks the "Vlan" switch cutout on the front of the enclosure.
+
+### Programming
+
+Use a SOIC-8 clamp to the flash chip (U1 on silkscreen) at the top of the board, leaving it otherwise unpowered.
+
+The board has been seen to ship with a single [BoyaMicro BY25Q16BSSIG](https://www.lcsc.com/datasheet/C382744.pdf) 16Mbit (2MiB) chip, though exact BOM may vary.
+
+
+
+### What works
+
+- All four 2.5GBASE-T RJ45 ports at 10/100/1000/2500 Mbps
+- Both SFP ports supporting 1G, 2.5G and 10G modules
+- LEDs (Power LED is always on)
+
+### PCB overview
+
+#### Board markings
+- Top silkscreen: PCB-K0402W-V1.0 / DIP-K0402WS-V1.0
+
+#### Key components
+- U1: SPI NOR flash, 2 MiB
+- S1: unpopulated slide switch footprint (three through-holes used as serial console)
+
+Front panel
+
+
+
+PCB top
+
+
+
+PCB bottom
+
+
+
+Bottom and rear
+
+
+
+### Power supply
+
+Input power is delivered via a standard DC barrel jack (5.5x2.1mm) with an included 12V 1A adapter.
+
+There is an optional grounding screw next to the DC input.
+
+### Serial console
+
+The PCB has a slide switch footprint (unpopulated) at the front right that is connected to the UART. It is labeled as "S1" on the silkscreen.
+
+Facing the top front (port) side of the board, the pinout from left to right is:
+
+| Position | Signal | GPIO |
+|----------|--------|-------------------|
+| 1 | RX | GPIO32\_UART0\_RX |
+| 2 | GND | N/A |
+| 3 | TX | GPIO31\_UART0\_TX |
+
+Standard 0.1" / 2.54mm pin headers will not fit, so wires or clips may be used instead.
+
+The image below shows some oversized clips clumsily attached.
+
+
diff --git a/doc/devices/PCB-K0402WS-V3.0.md b/doc/devices/PCB-K0402WS-V3.0.md
index ae0d5910..6246a910 100644
--- a/doc/devices/PCB-K0402WS-V3.0.md
+++ b/doc/devices/PCB-K0402WS-V3.0.md
@@ -22,6 +22,11 @@ of the device just above the big label, might be covered by a QC sticker.
* SICSOLINK SL-G0402F
+
+* YuanLey YS25-0402 Note: there are [multiple revisions](PCB-K0402WS-V1.0.md) of the YS25-0402. This is the newer revision that has a "Vlan" switch on the front.
+
+
+
### Programming
Using SPI clamp in-board is the only method for initial installation.
diff --git a/doc/devices/photos/PCB-K0402WS-V1.0/bottom.jpg b/doc/devices/photos/PCB-K0402WS-V1.0/bottom.jpg
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diff --git a/doc/devices/photos/PCB-K0402WS-V1.0/ports.jpg b/doc/devices/photos/PCB-K0402WS-V1.0/ports.jpg
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diff --git a/doc/devices/photos/PCB-K0402WS-V1.0/uart.jpg b/doc/devices/photos/PCB-K0402WS-V1.0/uart.jpg
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diff --git a/doc/devices/photos/PCB-K0402WS-V3.0/YuanLey_YS25-0402.jpg b/doc/devices/photos/PCB-K0402WS-V3.0/YuanLey_YS25-0402.jpg
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diff --git a/doc/supported_devices.md b/doc/supported_devices.md
index 6bbcb8d4..f0b11c63 100644
--- a/doc/supported_devices.md
+++ b/doc/supported_devices.md
@@ -42,6 +42,8 @@ The following devices have been tested and are fully working:
| TRENDnet | TEG-S562 | No | [TEG-S563/EU H/W: V1.0R](devices/TEG-S562.md) | 2M | 4 + 2 |
| XikeStor | SKS3200M-4GPY2XF| Yes | [SWTG024AS-v1.0](devices/SWTG024AS.md) | | 4 + 2 |
| XikeStor | SKS3200-8E1X | Yes | [SWTG118AS-V2.1-17462](devices/SWTGW218AS.md) | 2M | 8 + 1 |
+| YuanLey | YS25-0402 | No | [PCB-K0402WS-V1.0](devices/PCB-K0402WS-V1.0.md) | 2M | 4 + 2 |
+| YuanLey | YS25-0402 | No | [PCB-K0402WS-V3.0](devices/PCB-K0402WS-V3.0.md) | 2M | 4 + 2 |
| Ztyuav | Z-QWYT0402 | No | [PCB-K0402WS-V3.0](devices/PCB-K0402WS-V3.0.md) | | 4 + 2 |
For KP-9000-6XH-X2 / KP-9000-6XHML-X2 / Mokerlink 2G040210GSM devices, select
diff --git a/machine/PCB_K0402WS_V1.c b/machine/PCB_K0402WS_V1.c
new file mode 100644
index 00000000..0f365025
--- /dev/null
+++ b/machine/PCB_K0402WS_V1.c
@@ -0,0 +1,57 @@
+#include "machine_defs.h"
+
+__code const struct machine machine = {
+ .machine_name = MACHINE_MODEL,
+ .isRTL8373 = 0,
+ .min_port = 3,
+ .max_port = 8,
+ .n_sfp = 2,
+ .log_to_phys_port = {0, 0, 0, 6, 1, 2, 3, 4, 5},
+ .phys_to_log_port = {4, 5, 6, 7, 8, 3, 0, 0, 0},
+ .is_sfp = {0, 0, 0, 2, 0, 0, 0, 0, 1},
+
+ /* Left SFP (logical 8, SDS1): GPIO30=ModAbs, GPIO37=RX_LOS */
+ .sfp_port[0].pin_detect = GPIO30_ACL_BIT3_EN,
+ .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 ),
+
+ /* Right SFP (logical 3, SDS0): GPIO50=ModAbs, GPIO51=RX_LOS */
+ .sfp_port[1].pin_detect = GPIO50_I2C_SCL2_UART1_TX,
+ .sfp_port[1].pin_los = GPIO51_I2C_SDA2_UART1_RX,
+ .sfp_port[1].pin_tx_disable = GPIO_NA,
+ .sfp_port[1].sds = 0,
+ .sfp_port[1].i2c = I2CBUS( GPIO41_I2C_SDA3_MDIO1, GPIO40_I2C_SCL3_MDC1 ),
+
+ .reset_pin = GPIO_NA,
+
+ /* These don't appear to be populated / wired-up; the power LED is always on */
+ .high_leds = { 0 },
+
+ /* Copper ports use SET0; SFP ports use SET1 */
+ .port_led_set = {0, 0, 0, 1, 0, 0, 0, 0, 1},
+
+ .led_sets = {
+ { /* SET0: copper — LED0=amber (2.5G), LED2=green (1G/100M/10M) */
+ LEDS_2G5 | LEDS_LINK | LEDS_ACT,
+ 0,
+ LEDS_1G | LEDS_100M | LEDS_10M | LEDS_LINK | LEDS_ACT,
+ 0
+ },
+ { /* SET1: SFP — all speeds link/act */
+ LEDS_10G | LEDS_2G5 | LEDS_1G | LEDS_100M | LEDS_10M | LEDS_LINK | LEDS_ACT,
+ 0,
+ 0,
+ 0
+ },
+ },
+
+ .led_mux_custom = 1,
+ .led_mux = {
+ 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* GPIO0-7: unused */
+ 0x0f, 0x0c, 0x0d, 0x0e, 0x10, 0x11, 0x12, /* GPIO8-14 */
+ 0x14, 0x15, 0x16, 0x18, 0x19, 0x1a, /* GPIO15-20 */
+ 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x23 /* GPIO21-27 */
+ },
+};
diff --git a/machine/PCB_K0402WS_V1.h b/machine/PCB_K0402WS_V1.h
new file mode 100644
index 00000000..d1170aa7
--- /dev/null
+++ b/machine/PCB_K0402WS_V1.h
@@ -0,0 +1,6 @@
+#ifndef _MACHINE_PCB_K0402WS_V1_H_
+#define _MACHINE_PCB_K0402WS_V1_H_
+
+#define MACHINE_MODEL "PCB-K0402WS-V1.0"
+
+#endif