diff --git a/firmware/ice40-riscv/icE1usb/config.h b/firmware/ice40-riscv/icE1usb/config.h
index e10a120..f467b65 100644
--- a/firmware/ice40-riscv/icE1usb/config.h
+++ b/firmware/ice40-riscv/icE1usb/config.h
@@ -8,7 +8,7 @@
 #pragma once
 
 #define SPI_FLASH_BASE	0x80000000
-#define UART_BASE	0x81000000
+#define DBG_UART_BASE	0x81000000
 #define LED_BASE	0x82000000
 #define USB_CORE_BASE	0x83000000
 #define USB_DATA_BASE	0x84000000
@@ -16,3 +16,10 @@
 #define DMA_BASE	0x86000000
 #define E1_CORE_BASE	0x87000000
 #define MISC_BASE	0x88000000
+#define GPS_UART_BASE	0x89000000
+#define I2C_BASE	0x8a000000
+
+/* Alias for common code */
+#define UART_BASE DBG_UART_BASE
+
+#define SYS_CLK_FREQ	30720000