[U-Boot] [PATCH] IXP425: Changing serial port initialization sequence Part 1/1

Stefan Althoefer
2008-12-04T21:09:53Z

[PATCH] IXP425: Changing serial port initialization sequence

On my IXP425 board (Janz emPC-A400), the first few characters of
the u-boot startup message were missing.

I fixed it by enabling the UART before all other initialization.

I also enabled (and flushed) the FIFO of the UART.

The patch is against "latest" u-boot git-repository

Please (still) be patient if style of submission or patches are
offending.

Signed-off-by: Stefan Althoefer <stefan.althoefer@web.de>
----

diff -uprN u-boot-orig//cpu/ixp/serial.c u-boot/cpu/ixp/serial.c
--- u-boot-orig//cpu/ixp/serial.c 2008-12-02 17:25:31.000000000 +0100
+++ u-boot/cpu/ixp/serial.c 2008-12-02 22:46:27.000000000 +0100
@@ -50,8 +50,10 @@ void serial_setbrg (void)
else
hang ();

- IER(uart) = 0; /* Disable for now */
- FCR(uart) = 0; /* No fifos enabled */
+ IER(uart) = IER_UUE;
+
+ /* Enable an clear FIFOs */
+ FCR(uart) = FCR_RESETTF | FCR_RESETRF | FCR_TRFIFOE;

/* set baud rate */
LCR(uart) = LCR_WLS0 | LCR_WLS1 | LCR_DLAB;
@@ -63,7 +65,6 @@ void serial_setbrg (void)
#else
MCR(uart) = 0; /* set RTS inactive */
#endif
- IER(uart) = IER_UUE;
}

/*