Patch merged into coreboot/master: ca436cb tegra124: add custom uart

the following patch was just integrated into master:
commit ca436cb247a78b234feb7975575883bdcbabc348
Author: Gabe Black 
Date:   Sun Sep 29 07:06:08 2013 -0700

tegra124: add custom uart

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
    Signed-off-by: Gabe Black 
    Reviewed-on: https://chromium-review.googlesource.com/171030
    Reviewed-by: Ronald Minnich 
    Commit-Queue: Gabe Black 
    Tested-by: Gabe Black 
    (cherry picked from commit e0059181958cfe8afec2f3a7ea732e81f5d55e5d)

tegra124: Re-enable waiting for the transmitter to empty in the test function.

The compiler was emitting code compatible with armv7-a, but the bootblock was
    running on a core which uses armv4t. By coincidence, it was emitting an
    instruction which is unavailable on armv4t when checking the value of the
    UART's LSR register. Now that the bootblock is compiled with more appropriate
    flags, this code can be re-introduced.

Old-Change-Id: I7ecada4138b0889b963d1a8b19a4bab8e0bb1add
    Signed-off-by: Gabe Black 
    Reviewed-on: https://chromium-review.googlesource.com/170997
    Reviewed-by: Gabe Black 
    Tested-by: Gabe Black 
    Commit-Queue: Gabe Black 
    (cherry picked from commit 2a0adceb5029c8ee633d17c82dbb11e48d30349d)

tegra124: Seperate out the non-UART specific hardcoded init in the bootblock.

The hardcoded init in the test function in the bootblock is actually useful
    generally because it doesn't belong in the UART driver itself but is necessary
    for the UART to work. Until we have real implementations for the pinmux, etc.,
    we can use that code to get the UART and console going.

Old-Change-Id: I2efe0b571d8b022eb2a2e5569620558540b28373
    Signed-off-by: Gabe Black 
    Reviewed-on: https://chromium-review.googlesource.com/171334
    Reviewed-by: Ronald Minnich 
    Tested-by: Gabe Black 
    Commit-Queue: Gabe Black 
    (cherry picked from commit ae7d4d890be1936cc86dc15adeb33f3b46a51ae5)

tegra124: Implement and enable serial console support for tegra124.

The driver is very similar to the 8250 driver, except it isn't in two parts,
    and it also spaces its registers 4 bytes apart instead of having them directly
    adjacent to each other.

Also, eliminate the UART test function in the bootblock. It's no longer needed
    since the actual console output serves the same purpose.

Right now the clock divisor is fixed for now, and we'll want to actually
    figure out what value to use at some point.

Old-Change-Id: Idd659222901eb76b0ed8cbb986deb5124096f2f6
    Signed-off-by: Gabe Black 
    Reviewed-on: https://chromium-review.googlesource.com/171337
    Reviewed-by: Gabe Black 
    Commit-Queue: Gabe Black 
    Tested-by: Gabe Black 
    (cherry picked from commit 86f5e2875b18901b349283cfbcd4f8cc88b7a019)

Squashed 4 commits related to uart support for tegra124. Modified the
    new uart.c to look like the uart.c for exynos5420.

Change-Id: I490cba014a43d58c30c48ca9ddcae2b00095b7a6
    Signed-off-by: Isaac Christensen 
    Reviewed-on: http://review.coreboot.org/6764
    Tested-by: build bot (Jenkins)
    Reviewed-by: David Hendricks

See http://review.coreboot.org/6764 for details.

-gerrit