84 lines
2.6 KiB
ArmAsm
84 lines
2.6 KiB
ArmAsm
/*
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* (C) Copyright 2010 Quantenna Communications Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*****************************************************************************
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* This module provides several critical functions for a couple of scenarios:
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* 1) For the case of uboot in flash, copy code to target
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* 2) For the case of uboot loaded via serial, make clean copy for subsequent flash ops
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* 3) Initialize ddr
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* 4) Clear BSS
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*****************************************************************************/
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#include <config.h>
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#include <asm/arcregs.h>
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#include <asm/arch/platform.h>
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#include "ruby.h"
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#include <ruby_version.h>
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/*****MACROS**********************************************************************************/
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#include "start.inl"
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/*****TEXT SECTION****************************************************************************/
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.section .text
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.align 4
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_start:
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.globl _start
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b 1f
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/* need easily identifiable tag at beginning of file with version */
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.ascii "U-BOOT " RUBY_UBOOT_VERSION "\0"
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/* Early board config metadata can go here, from 32-48 bytes */
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.align 32
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early_flash_config_start:
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.globl early_flash_config_start
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.skip 16
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early_flash_config_end:
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.globl early_flash_config_end
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1:
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M_REMOVE_FROM_RESET
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M_GOTO_IF_EXEC_REMAPPED_SRAM run_c
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M_IF_BOOT_FROM_FLASH
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bne ruby_flip_mmap /* if we are running not from flash call the flip routine to
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* flip the bit in place; will return to ruby_boot label */
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j ruby_boot - TEXT_BASE + RUBY_SPI_FLASH_ADDR /* jump to physical spi address */
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ruby_boot:
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.globl ruby_boot
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M_IF_BOOT_FROM_FLASH
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bne run_c
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M_REMAP_MEM
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M_COPY_UBOOT TEXT_BASE RUBY_SPI_FLASH_ADDR
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j run_c
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run_c:
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M_FILL_BSS
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#ifdef CONFIG_ARC_MAKE_UBOOT_COPY
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M_COPY_UBOOT CONFIG_ARC_FREE_BEGIN TEXT_BASE
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#endif
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M_GOTO_C_CODE
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/*********************************************************************************************/
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