diff --git a/firmware/ice40-riscv/icE1usb/e1.c b/firmware/ice40-riscv/icE1usb/e1.c
index 0f1d89d..ad12fe2 100644
--- a/firmware/ice40-riscv/icE1usb/e1.c
+++ b/firmware/ice40-riscv/icE1usb/e1.c
@@ -412,10 +412,14 @@
 		return;
 
 	/* HACK: LED link status */
-	if (e1_regs->rx.csr & E1_RX_SR_ALIGNED)
+	if (e1_regs->rx.csr & E1_RX_SR_ALIGNED) {
+		e1_platform_led_set(0, E1P_LED_GREEN, E1P_LED_ST_ON);
 		led_color(0, 48, 0);
-	else
+	} else {
+		e1_platform_led_set(0, E1P_LED_GREEN, E1P_LED_ST_BLINK);
+		/* TODO: completely off if rx tick counter not incrementing */
 		led_color(48, 0, 0);
+	}
 
 	/* Recover any done TX BD */
 	while ( (bd = e1_regs->tx.bd) & E1_BD_VALID ) {
diff --git a/firmware/ice40-riscv/icE1usb/e1.h b/firmware/ice40-riscv/icE1usb/e1.h
index e68514f..c438cb9 100644
--- a/firmware/ice40-riscv/icE1usb/e1.h
+++ b/firmware/ice40-riscv/icE1usb/e1.h
@@ -13,3 +13,19 @@
 
 volatile uint8_t *e1_data_ptr(int mf, int frame, int ts);
 unsigned int e1_data_ofs(int mf, int frame, int ts);
+
+enum e1_platform_led {
+	E1P_LED_GREEN		= 0,
+	E1P_LED_YELLOW		= 1,
+};
+
+enum e1_platform_led_state {
+	E1P_LED_ST_OFF		= 0,
+	E1P_LED_ST_ON		= 1,
+	E1P_LED_ST_BLINK	= 2,
+	E1P_LED_ST_BLINK_FAST	= 3
+};
+
+/* external function provided by the platform; used by E1 driver to control LEDs */
+extern void e1_platform_led_set(uint8_t port, enum e1_platform_led led,
+				enum e1_platform_led_state state);
diff --git a/firmware/ice40-riscv/icE1usb/misc.c b/firmware/ice40-riscv/icE1usb/misc.c
index dca126a..3117be9 100644
--- a/firmware/ice40-riscv/icE1usb/misc.c
+++ b/firmware/ice40-riscv/icE1usb/misc.c
@@ -10,6 +10,7 @@
 
 #include "config.h"
 #include "misc.h"
+#include "e1.h"
 
 
 struct misc {
@@ -51,6 +52,24 @@
 	misc_regs->e1_led = (enable ? 0x100 : 0x000) | cfg;
 }
 
+void
+e1_platform_led_set(uint8_t port, enum e1_platform_led led,
+		    enum e1_platform_led_state state)
+{
+	uint32_t tmp;
+	unsigned int shift;
+
+	if (port >= 2)
+		return;
+
+	shift = 4*port + 2*led;
+
+	tmp = misc_regs->e1_led;
+	tmp &= ~(3 << shift);
+	tmp |= 0x100 | ((state & 3) << shift);
+	misc_regs->e1_led = tmp;
+}
+
 uint16_t
 e1_tick_read(void)
 {