Payloads
Spam UART A TX
ECHO UART RX to TX
work in progress.
Hardware (PinMUX)
Looks like UARTA is using the ULPI pins as noted here (https://github.com/u-boot/u-boot/blob/master/arch/arm/mach-tegra/tegra30/pinmux.c#L238) So we know we can setup our UARTA and UARTD on the ULPI pins
#if defined UARTA
/* set pinmux for uart-a (nexus 7) */
reg_write(PINMUX_BASE, PINMUX_AUX_ULPI_DATA0_0, 0b00000110); /* tx */
reg_write(PINMUX_BASE, PINMUX_AUX_ULPI_DATA1_0, 0b00100110); /* rx */
#elif defined UARTD
/* set pinmux for uart-d (ouya */
reg_write(PINMUX_BASE, PINMUX_AUX_ULPI_CLK_0, 0b00000110); /* tx */
reg_write(PINMUX_BASE, PINMUX_AUX_ULPI_DIR_0, 0b00100110); /* rx */
#endif
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