tegra124: add custom uart

Hardware / Coreboot - Gabe Black [google.com] - 28 August 2014 23:47 UTC

tegra124: Add a test function which spams exclamation points on the UART.

This function spews characters on the console and, until we have a working console, is an easy way to see whether the system boots to a particular point. For some reason waiting for transmitter to be empty hangs, but transmitting characters still works.

Old-Change-Id: I1622c8a58849f4b8bdcaa67500b81042d7346df4

ca436cb tegra124: add custom uart
src/soc/nvidia/tegra124/Kconfig | 2 +
src/soc/nvidia/tegra124/Makefile.inc | 3 +
src/soc/nvidia/tegra124/bootblock.c | 52 ++++++++++++-
src/soc/nvidia/tegra124/uart.c | 137 ++++++++++++++++++++++++++++++++++
4 files changed, 192 insertions(+), 2 deletions(-)

Upstream: review.coreboot.org

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