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/arm/include/asm/arch-am33xx/clocks_am33xx.h

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/*
* clocks_am33xx.h
*
* AM33xx clock define
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _CLOCKS_AM33XX_H_
#define _CLOCKS_AM33XX_H_
#define OSC 24
/* MAIN PLL Fdll = 550 MHZ, */
#define MPUPLL_M 550
#define MPUPLL_N 23
#define MPUPLL_M2 1
/* Core PLL Fdll = 1 GHZ, */
#define COREPLL_M 1000
#define COREPLL_N 23
#define COREPLL_M4 10 /* CORE_CLKOUTM4 = 200 MHZ */
#define COREPLL_M5 8 /* CORE_CLKOUTM5 = 250 MHZ */
#define COREPLL_M6 4 /* CORE_CLKOUTM6 = 500 MHZ */
/*
* USB PHY clock is 960 MHZ. Since, this comes directly from Fdll, Fdll
* frequency needs to be set to 960 MHZ. Hence,
* For clkout = 192 MHZ, Fdll = 960 MHZ, divider values are given below
*/
#define PERPLL_M 960
#define PERPLL_N 23
#define PERPLL_M2 5
/* DDR Freq is 266 MHZ for now */
/* Set Fdll = 400 MHZ , Fdll = M * 2 * CLKINP/ N + 1; clkout = Fdll /(2 * M2) */
#define DDRPLL_M 266
#define DDRPLL_N 23
#define DDRPLL_M2 1
extern void pll_init(void);
extern void enable_emif_clocks(void);
#endif /* endif _CLOCKS_AM33XX_H_ */