2 files changed, 9 insertions, 1 deletions
diff --git a/src/soc/sifive/fu540/Kconfig b/src/soc/sifive/fu540/Kconfig
index c438a10162..457d16bb4e 100644
--- a/src/soc/sifive/fu540/Kconfig
+++ b/src/soc/sifive/fu540/Kconfig
@@ -20,7 +20,7 @@ config SOC_SIFIVE_FU540
 	select ARCH_RAMSTAGE_RISCV
 	select BOOTBLOCK_CONSOLE
 	select DRIVERS_UART_SIFIVE
-
+	select UART_OVERRIDE_REFCLK
 if SOC_SIFIVE_FU540
 
 config RISCV_ARCH
diff --git a/src/soc/sifive/fu540/uart.c b/src/soc/sifive/fu540/uart.c
index 940dc97856..c53f42d9d8 100644
--- a/src/soc/sifive/fu540/uart.c
+++ b/src/soc/sifive/fu540/uart.c
@@ -23,3 +23,11 @@ uintptr_t uart_platform_base(int idx)
 	else
 		return 0;
 }
+
+unsigned int uart_platform_refclk(void)
+{
+	/*
+	 * The SiFive UART uses tlclk, which is coreclk/2 as input
+	 */
+	return 33330000 / 2;
+}