upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/include/cros_ec_message.h

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/*
* Chromium OS Matrix Keyboard Message Protocol definitions
*
* Copyright (c) 2012 The Chromium OS Authors.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _CROS_MESSAGE_H
#define _CROS_MESSAGE_H
/*
* Command interface between EC and AP, for LPC, I2C and SPI interfaces.
*
* This is copied from the Chromium OS Open Source Embedded Controller code.
*/
enum {
/* The header byte, which follows the preamble */
MSG_HEADER = 0xec,
MSG_HEADER_BYTES = 3,
MSG_TRAILER_BYTES = 2,
MSG_PROTO_BYTES = MSG_HEADER_BYTES + MSG_TRAILER_BYTES,
/* Max length of messages */
MSG_BYTES = EC_PROTO2_MAX_PARAM_SIZE + MSG_PROTO_BYTES,
};
#endif