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tegra2: Plumb in SPI/UART switch code

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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 <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Simon Glass 2011-11-05 04:46:51 +00:00 • committed by Albert ARIBAUD
parent 4560c7decc
commit a04eba99f5
3 changed files with 12 additions and 0 deletions
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3
board/nvidia/seaboard/seaboard.c
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@ -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
/*