MdeModulePkg/BaseSerialPortLib16550: Fix Serial Port Ready

[mirror_edk2.git] / MdeModulePkg / Library / BaseSerialPortLib16550 / BaseSerialPortLib16550.c

diff --git a/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c b/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c
index bbae379887c075ab0ebf588ca320d89849dfe590..9cb50dd80d5634ab2aa6d68bf5ca7fb891463eef 100644 (file)
--- a/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c
+++ b/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c
@@ -646,7 +646,7 @@ SerialPortWrite (
     // Wait for the serial port to be ready, to make sure both the transmit FIFO\r
     // and shift register empty.\r
     //\r
-    while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & B_UART_LSR_TEMT) == 0);\r
+    while ((SerialPortReadRegister (SerialRegisterBase, R_UART_LSR) & (B_UART_LSR_TEMT | B_UART_LSR_TXRDY)) != (B_UART_LSR_TEMT | B_UART_LSR_TXRDY));\r
 \r
     //\r
     // Fill then entire Tx FIFO\r