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/arch/x86/include/asm/turbo.h

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/*
* From coreboot file of the same name
*
* Copyright (C) 2011 The ChromiumOS Authors. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0
*/
#ifndef _ASM_TURBO_H
#define _ASM_TURBO_H
#define CPUID_LEAF_PM 6
#define PM_CAP_TURBO_MODE (1 << 1)
enum {
TURBO_UNKNOWN,
TURBO_UNAVAILABLE,
TURBO_DISABLED,
TURBO_ENABLED,
};
/* Return current turbo state */
int turbo_get_state(void);
/* Enable turbo */
void turbo_enable(void);
#endif