The document "PC16550D Universal Asynchronous Receiver Transmitter with FIFOs" (vers. June 1995, http://www.national.com/ds/PC/PC16550D.pdf) states that IER (Interrupt Enable Register) is accessible if the bit DLAB = 0 (DLAB is bit 7 in LCR; in barebox DLAB known as LCR_BKSE). So before IER access we need set DLAB to 0. Signed-off-by: Antony Pavlov <antonynpavlov@xxxxxxxxx> --- drivers/serial/serial_ns16550.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c index 802331d..88ba836 100644 --- a/drivers/serial/serial_ns16550.c +++ b/drivers/serial/serial_ns16550.c @@ -140,7 +140,9 @@ static inline unsigned int ns16550_calc_divisor(struct console_device *cdev, static void ns16550_serial_init_port(struct console_device *cdev) { /* initializing the device for the first time */ + ns16550_write(cdev, 0x00, lcr); /* select ier reg */ ns16550_write(cdev, 0x00, ier); + #ifdef CONFIG_DRIVER_SERIAL_NS16550_OMAP_EXTENSIONS ns16550_write(cdev, 0x07, mdr1); /* Disable */ #endif -- 1.7.8.3 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
