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-rw-r--r--src/drivers/uart/uart8250reg.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/drivers/uart/uart8250reg.h b/src/drivers/uart/uart8250reg.h
index 35a6845554..c6f23ac1ca 100644
--- a/src/drivers/uart/uart8250reg.h
+++ b/src/drivers/uart/uart8250reg.h
@@ -24,6 +24,7 @@
#define UART8250_IIR_THRI 0x02 /* Transmitter holding register empty */
#define UART8250_IIR_RDI 0x04 /* Receiver data interrupt */
#define UART8250_IIR_RLSI 0x06 /* Receiver line status interrupt */
+#define UART8250_IIR_FIFO_EN 0xC0 /* FIFO enabled */
#define UART8250_FCR 0x02
#define UART8250_FCR_FIFO_EN BIT(0) /* Fifo enable */