Several customers are using UART2 (normally the serial console
for U-Boot) as connections to printers or other peripherals
that are not tolerant of stray inputs during reset.
Provide a simple way to eliminate output on the serial port
by conditionally configuring these pads as GPIOs during
U-Boot.
Signed-off-by: Eric Nelson <eric.nel...@boundarydevices.com>
---
board/boundary/nitrogen6x/nitrogen6x.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/board/boundary/nitrogen6x/nitrogen6x.c
b/board/boundary/nitrogen6x/nitrogen6x.c
index e795492..621cdbc 100644
--- a/board/boundary/nitrogen6x/nitrogen6x.c
+++ b/board/boundary/nitrogen6x/nitrogen6x.c
@@ -77,9 +77,15 @@ static iomux_v3_cfg_t const uart1_pads[] = {
MX6_PAD_SD3_DAT7__UART1_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL),
};
+/* #define CONFIG_SILENT_UART */
static iomux_v3_cfg_t const uart2_pads[] = {
+#ifndef CONFIG_SILENT_UART
MX6_PAD_EIM_D26__UART2_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL),
MX6_PAD_EIM_D27__UART2_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL),
+#else
+ MX6_PAD_EIM_D26__GPIO3_IO26 | MUX_PAD_CTRL(UART_PAD_CTRL),
+ MX6_PAD_EIM_D27__GPIO3_IO27 | MUX_PAD_CTRL(UART_PAD_CTRL),
+#endif
};
#define PC MUX_PAD_CTRL(I2C_PAD_CTRL)
--
1.9.1
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