diff options
| -rw-r--r-- | README | 8 | ||||
| -rw-r--r-- | drivers/serial/ns16550.c | 18 | ||||
| -rw-r--r-- | include/configs/igep00x0.h | 3 |
3 files changed, 16 insertions, 13 deletions
@@ -627,14 +627,6 @@ The following options need to be configured: boot loader that has already initialized the UART. Define this variable to flush the UART at init time. - CONFIG_SYS_NS16550_BROKEN_TEMT - - 16550 UART set the Transmitter Empty (TEMT) Bit when all output - has finished and the transmitter is totally empty. U-Boot waits - for this bit to be set to initialize the serial console. On some - broken platforms this bit is not set in SPL making U-Boot to - hang while waiting for TEMT. Define this option to avoid it. - - Console Interface: Depending on board, define exactly one serial port diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index ed4e6b3..7f013ab 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -36,10 +36,24 @@ void NS16550_init(NS16550_t com_port, int baud_divisor) { -#if (!defined(CONFIG_SYS_NS16550_BROKEN_TEMT)) +#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_OMAP34XX)) + /* + * On some OMAP3 devices when UART3 is configured for boot mode before + * SPL starts only THRE bit is set. We have to empty the transmitter + * before initialization starts. + */ + if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE)) + == UART_LSR_THRE) { + serial_out(UART_LCR_DLAB, &com_port->lcr); + serial_out(baud_divisor & 0xff, &com_port->dll); + serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); + serial_out(UART_LCRVAL, &com_port->lcr); + serial_out(0, &com_port->mdr1); + } +#endif + while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT)) ; -#endif serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); #if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \ diff --git a/include/configs/igep00x0.h b/include/configs/igep00x0.h index 849fb16..1d8090b 100644 --- a/include/configs/igep00x0.h +++ b/include/configs/igep00x0.h @@ -69,9 +69,6 @@ #define CONFIG_SYS_NS16550_REG_SIZE (-4) #define CONFIG_SYS_NS16550_CLK V_NS16550_CLK -/* define to avoid U-Boot to hang while waiting for TEMT */ -#define CONFIG_SYS_NS16550_BROKEN_TEMT - /* select serial console configuration */ #define CONFIG_CONS_INDEX 3 #define CONFIG_SYS_NS16550_COM3 OMAP34XX_UART3 |