On Seaboard the UART and SPI interfere with each other. This causes the UART
to receive spurious zero bytes after SPI transactions and also means that
SPI can corrupt a few output characters when it starts up if they are still
in the UART buffer.
This updates the board to use the SPI/UART switch to avoid the problem.
For now this feature is turned off since it needs changes to the NS16550
UART to operate.
Signed-off-by: Simon Glass <s...@chromium.org>
---
board/nvidia/common/board.c | 8 ++++++++
board/nvidia/common/board.h | 1 +
board/nvidia/seaboard/seaboard.c | 3 +++
3 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/board/nvidia/common/board.c b/board/nvidia/common/board.c
index 2591ebc..0403645 100644
--- a/board/nvidia/common/board.c
+++ b/board/nvidia/common/board.c
@@ -112,9 +112,13 @@ static void pin_mux_uart(int uart_ids)
*/
int board_init(void)
{
+ /* Do clocks and UART first so that printf() works */
clock_init();
clock_verify();
+#ifdef CONFIG_SPI_UART_SWITCH
+ gpio_config_uart();
+#endif
#ifdef CONFIG_TEGRA2_SPI
spi_init();
#endif
@@ -149,7 +153,11 @@ int board_early_init_f(void)
pin_mux_uart(uart_ids);
/* Initialize periph GPIOs */
+#ifdef CONFIG_SPI_UART_SWITCH
+ gpio_early_init_uart();
+#else
gpio_config_uart();
+#endif
/* Init UART, scratch regs, and start CPU */
tegra2_start();
diff --git a/board/nvidia/common/board.h b/board/nvidia/common/board.h
index 35acbca..2c89ff4 100644
--- a/board/nvidia/common/board.h
+++ b/board/nvidia/common/board.h
@@ -27,5 +27,6 @@
void tegra2_start(void);
void gpio_config_uart(void);
int tegra2_mmc_init(int dev_index, int bus_width, int pwr_gpio, int cd_gpio);
+void gpio_early_init_uart(void);
#endif /* BOARD_H */
diff --git a/board/nvidia/seaboard/seaboard.c b/board/nvidia/seaboard/seaboard.c
index 7f2827b..0b779f6 100644
--- a/board/nvidia/seaboard/seaboard.c
+++ b/board/nvidia/seaboard/seaboard.c
@@ -31,6 +31,8 @@
#endif
#include "../common/board.h"
+/* TODO: Remove this code when the SPI switch is working */
+#ifndef CONFIG_SPI_UART_SWITCH
/*
* Routine: gpio_config_uart_seaboard
* Description: Force GPIO_PI3 low on Seaboard so UART4 works.
@@ -48,6 +50,7 @@ void gpio_config_uart(void)
return;
gpio_config_uart_seaboard();
}
+#endif
#ifdef CONFIG_TEGRA2_MMC
/*
--
1.7.3.1
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