diff options
Diffstat (limited to 'drivers/serial/ns16550.c')
| -rw-r--r-- | drivers/serial/ns16550.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index a92d2b1de8..9851663dc5 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -171,6 +171,13 @@ void NS16550_init(NS16550_t com_port, int baud_divisor) == UART_LSR_THRE) { if (baud_divisor != -1) NS16550_setbrg(com_port, baud_divisor); + else { + // Re-use old baud rate divisor to flush transmit reg. + const int dll = serial_in(&com_port->dll); + const int dlm = serial_in(&com_port->dlm); + const int divisor = dll | (dlm << 8); + NS16550_setbrg(com_port, divisor); + } serial_out(0, &com_port->mdr1); } #endif |