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/asm-ppc/config.h

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/*
* Copyright 2009 Freescale Semiconductor, Inc.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#ifndef _ASM_CONFIG_H_
#define _ASM_CONFIG_H_
#ifndef CONFIG_MAX_MEM_MAPPED
#if defined(CONFIG_4xx) || defined(CONFIG_E500) || defined(CONFIG_MPC86xx)
#define CONFIG_MAX_MEM_MAPPED ((phys_size_t)2 << 30)
#else
#define CONFIG_MAX_MEM_MAPPED (256 << 20)
#endif
#endif
/* Check if boards need to enable FSL DMA engine for SDRAM init */
#if !defined(CONFIG_FSL_DMA) && defined(CONFIG_DDR_ECC)
#if (defined(CONFIG_MPC83xx) && defined(CONFIG_DDR_ECC_INIT_VIA_DMA)) || \
((defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)) && \
!defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER))
#define CONFIG_FSL_DMA
#endif
#endif
#endif /* _ASM_CONFIG_H_ */