From: Peter Pickford <peter@netremedies.ca>
Date: Tue, 22 Apr 2014 12:45:42 +0000 (+0100)
Subject: [serial] Enable UART FIFOs
X-Git-Tag: v1.20.1~1228
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d644ad41f5a17315ab72f6ebeeecf895f7d41679;p=thirdparty%2Fipxe.git

[serial] Enable UART FIFOs

Escape sequences received via the serial console can fail since the
cpu_nap() in getchar_timeout() can delay processing for more than the
time it takes for a single character to arrive.

Fix by enabling the UART FIFOs.

Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
---

diff --git a/src/core/serial.c b/src/core/serial.c
index 8f5a159c4..7e4460ab9 100644
--- a/src/core/serial.c
+++ b/src/core/serial.c
@@ -204,8 +204,8 @@ static void serial_init ( void ) {
 	/* disable interrupts */
 	uart_writeb(0x0, UART_BASE + UART_IER);
 
-	/* disable fifo's */
-	uart_writeb(0x00, UART_BASE + UART_FCR);
+	/* enable fifos */
+	uart_writeb(0x01, UART_BASE + UART_FCR);
 
 	/* Set clear to send, so flow control works... */
 	uart_writeb((1<<1), UART_BASE + UART_MCR);