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/usb_cdc_acm.h

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/*
* (C) Copyright 2006
* Bryan O'Donoghue, deckard@codehermit.ie, CodeHermit
*
* SPDX-License-Identifier: GPL-2.0+
*/
/* ACM Control Requests */
#define ACM_SEND_ENCAPSULATED_COMMAND 0x00
#define ACM_GET_ENCAPSULATED_RESPONSE 0x01
#define ACM_SET_COMM_FEATURE 0x02
#define ACM_GET_COMM_FEATRUE 0x03
#define ACM_CLEAR_COMM_FEATURE 0x04
#define ACM_SET_LINE_ENCODING 0x20
#define ACM_GET_LINE_ENCODING 0x21
#define ACM_SET_CONTROL_LINE_STATE 0x22
#define ACM_SEND_BREAK 0x23
/* ACM Notification Codes */
#define ACM_NETWORK_CONNECTION 0x00
#define ACM_RESPONSE_AVAILABLE 0x01
#define ACM_SERIAL_STATE 0x20
/* Format of response expected by a ACM_GET_LINE_ENCODING request */
struct rs232_emu{
unsigned long dter;
unsigned char stop_bits;
unsigned char parity;
unsigned char data_bits;
}__attribute__((packed));