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authorfche <fche>2008-01-28 20:59:25 +0000
committerfche <fche>2008-01-28 20:59:25 +0000
commit0f16be729dd58136d9791f6fc5d492f34bbbeeba (patch)
treee330ac37eeaa349ab167a77e0979ecbff8e83a04 /testsuite/systemtap.samples/testlog.stp
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Early debug UART support
 *
 * (C) Copyright 2014 Google, Inc
 * Writte by Simon Glass <sjg@chromium.org>
 */

#ifndef _DEBUG_UART_H
#define _DEBUG_UART_H

/*
 * The debug UART is intended for use very early in U-Boot to debug problems
 * when an ICE or other debug mechanism is not available.
 *
 * To use it you should:
 * - Make sure your UART supports this interface
 * - Enable CONFIG_DEBUG_UART
 * - Enable the CONFIG for your UART to tell it to provide this interface
 *       (e.g. CONFIG_DEBUG_UART_NS16550)
 * - Define the required settings as needed (see below)
 * - Call debug_uart_init() before use
 * - Call printch() to output a character
 *
 * Depending on your platform it may be possible to use this UART before a
 * stack is available.
 *
 * If your UART does not support this interface you can probably add support
 * quite easily. Remember that you cannot use driver model and it is preferred
 * to use no stack.
 *
 * You must not use this UART once driver model is working and the serial
 * drivers are up and running (done in serial_init()). Otherwise the drivers
 * may conflict and you will get strange output.
 *
 *
 * To enable the debug UART in your serial driver:
 *
 * - #include <debug_uart.h>
 * - Define _debug_uart_init(), trying to avoid using the stack
 * - Define _debug_uart_putc() as static inline (avoiding stack usage)
 * - Immediately afterwards, add DEBUG_UART_FUNCS to define the rest of the
 *     functionality (printch(), etc.)
 *
 * If your board needs additional init for the UART to work, enable
 * CONFIG_DEBUG_UART_BOARD_INIT and write a function called