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51 lines
1.0 KiB
ArmAsm
51 lines
1.0 KiB
ArmAsm
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/*
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* head.S
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*
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* Entry of n-boot
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*
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* Copyright (c) 2005-2008 Ingenic Semiconductor Inc.
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* Author: <jlwei@ingenic.cn>
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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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#include <config.h>
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#ifdef CONFIG_JZ4740
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#include <jz4740.h>
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#include <jz4740_board.h>
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#endif
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.text
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.set noreorder
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.global startup
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startup:
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#ifdef CONFIG_JZ4740
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.word JZ4740_NANDBOOT_CFG /* fetched by CPU during NAND Boot */
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#endif
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/*
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* Disable all interrupts
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*/
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la $8, 0xB0001004 /* INTC_IMR */
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li $9, 0xffffffff
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sw $9, 0($8)
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/*
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* CU0=UM=EXL=IE=0, BEV=ERL=1, IP2~7=1
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*/
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li $26, 0x0040FC04
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mtc0 $26, $12 /* CP0_STATUS */
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/* IV=1, use the specical interrupt vector (0x200) */
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li $26, 0x00800000
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mtc0 $26, $13 /* CP0_CAUSE */
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/* Setup stack pointer */
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la $29, 0x80004000
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/* Jump to the nand boot routine */
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j nand_boot
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nop
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.set reorder
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