From 01826abc02ce160501534788e63629ccbe31b05c Mon Sep 17 00:00:00 2001
From: Grazvydas Ignotas <notasas@gmail.com>
Date: Thu, 12 Nov 2009 11:46:07 +0200
Subject: [PATCH] OMAP3: pandora: fix booting without serial attached
When the board is booted without serial cable attached (which
is how most of them will be used) UART RX is left floating and
sometimes picks noise, which interrupts countdown and enters
U-Boot prompt instead of booting the kernel.
Fix this by setting up internal pullup on UART RX pin. This
does not prevent serial from working as the internal pullup
is weak.
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
---
board/pandora/pandora.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/board/pandora/pandora.h b/board/pandora/pandora.h
index 5bfa0f9e26..f0ad16b0a4 100644
--- a/board/pandora/pandora.h
+++ b/board/pandora/pandora.h
@@ -219,7 +219,8 @@ const omap3_sysinfo sysinfo = {
MUX_VAL(CP(UART2_RX), (IEN | PTD | EN | M4)) /*GPIO_147,*/\
/*UART2_RX*/\
/*Serial Interface (Peripheral boot, Linux console, on AV connector)*/\
- MUX_VAL(CP(UART3_RX_IRRX), (IEN | PTD | DIS | M0)) /*UART3_RX*/\
+ /*RX pulled up to avoid noise when nothing is connected to serial port*/\
+ MUX_VAL(CP(UART3_RX_IRRX), (IEN | PTU | EN | M0)) /*UART3_RX*/\
MUX_VAL(CP(UART3_TX_IRTX), (IDIS | PTD | DIS | M0)) /*UART3_TX*/\
/*LEDs (Controlled by OMAP)*/\
MUX_VAL(CP(MMC1_DAT6), (IDIS | PTD | DIS | M4)) /*GPIO_128*/\
--
2.39.5