init.s

Linux2.4.27在AT91RM9200下的U-BOOT代码。可以在Redhat9等版本下使用。适合ARM学习者使用。

/*
 * Copyright (C) 2003 Embedded Edge, LLC
 * Dan Malek <[e-mail]>
 * Copied from ADS85xx.
 * Updates for Silicon Tx GP3 8560.  We only support 32-bit flash
 * and DDR with SPD EEPROM configuration.
 *
 * Copyright (C) 2002,2003, Motorola Inc.
 * Xianghua Xiao <[e-mail]>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 */

#include <ppc_asm.tmpl>
#include <ppc_defs.h>
#include <asm/cache.h>
#include <asm/mmu.h>
#include <config.h>
#include <mpc85xx.h>

#define	entry_start \
	mflr	r1 	;	\
	bl	0f 	;

#define	entry_end \
0:	mflr	r0	;	\
	mtlr	r1	;	\
	blr		;

/* TLB1 entries configuration: */

	.section	.bootpg, "ax"
	.globl	tlb1_entry
tlb1_entry:
	entry_start

		/* If RAMBOOT, we are testing and the BDI has set up
		 * much of the MMU already.
		 * TLB 4,5 SDRAM
		 * TLB 15 is default CCSRBAR.
		 */
	.long 0x09	/* the following data table uses a few of 16 TLB entries */

	.long TLB1_MAS0(1,1,0)
	.long TLB1_MAS1(1,1,0,0,BOOKE_PAGESZ_1M)
	.long TLB1_MAS2(((CFG_CCSRBAR>>12) & 0xfffff),0,0,0,0,1,0,1,0)
	.long TLB1_MAS3(((CFG_CCSRBAR>>12) & 0xfffff),0,0,0,0,0,1,0,1,0,1)

	.long TLB1_MAS0(1,2,0)
	.long TLB1_MAS1(1,1,0,0,BOOKE_PAGESZ_16M)
	.long TLB1_MAS2(((CFG_FLASH_BASE>>12) & 0xfffff),0,0,0,0,1,0,1,0)
	.long TLB1_MAS3(((CFG_FLASH_BASE>>12) & 0xfffff),0,0,0,0,0,1,0,1,0,1)

	.long TLB1_MAS0(1,3,0)
	.long TLB1_MAS1(1,1,0,0,BOOKE_PAGESZ_1M)
	.long TLB1_MAS2(((CFG_LBC_LCLDEVS_BASE>>12) & 0xfffff),0,0,0,0,1,0,1,0)
	.long TLB1_MAS3(((CFG_LBC_LCLDEVS_BASE>>12) & 0xfffff),0,0,0,0,0,1,0,1,0,1)
	.long TLB1_MAS0(1,4,0)
	.long TLB1_MAS1(0,0,0,0,BOOKE_PAGESZ_1M)
	.long TLB1_MAS2(0,0,0,0,0,0,0,0,0)
	.long TLB1_MAS3(0,0,0,0,0,0,1,0,1,0,1)

	.long TLB1_MAS0(1,5,0)
	.long TLB1_MAS1(0,0,0,0,BOOKE_PAGESZ_1M)
	.long TLB1_MAS2(0,0,0,0,0,0,0,0,0)
	.long TLB1_MAS3(0,0,0,0,0,0,1,0,1,0,1)

	.long TLB1_MAS0(1,6,0)
	.long TLB1_MAS1(1,1,0,0,BOOKE_PAGESZ_64M)
#if defined(CONFIG_RAM_AS_FLASH)
	.long TLB1_MAS2(((CFG_LBC_SDRAM_BASE>>12) & 0xfffff),0,0,0,0,1,0,1,0)
#else
	.long TLB1_MAS2(((CFG_LBC_SDRAM_BASE>>12) & 0xfffff),0,0,0,0,0,0,0,0)
#endif
	.long TLB1_MAS3(((CFG_LBC_SDRAM_BASE>>12) & 0xfffff),0,0,0,0,0,1,0,1,0,1)

	.long TLB1_MAS0(1,7,0)
	.long TLB1_MAS1(1,1,0,0,BOOKE_PAGESZ_16K)
#ifdef CONFIG_L2_INIT_RAM
	.long TLB1_MAS2(((CFG_INIT_RAM_ADDR>>12) & 0xfffff),0,0,0,1,0,0,0,0)
#else
	.long TLB1_MAS2(((CFG_INIT_RAM_ADDR>>12) & 0xfffff),0,0,0,0,0,0,0,0)
#endif
	.long TLB1_MAS3(((CFG_INIT_RAM_ADDR>>12) & 0xfffff),0,0,0,0,0,1,0,1,0,1)

	.long TLB1_MAS0(1,8,0)
	.long TLB1_MAS1(1,1,0,0,BOOKE_PAGESZ_256M)
	.long TLB1_MAS2(((CFG_PCI_MEM_BASE>>12) & 0xfffff),0,0,0,0,1,0,1,0)
	.long TLB1_MAS3(((CFG_PCI_MEM_BASE>>12) & 0xfffff),0,0,0,0,0,1,0,1,0,1)

#if (CFG_CCSRBAR_DEFAULT != CFG_CCSRBAR)
	.long TLB1_MAS0(1,15,0)
	.long TLB1_MAS1(1,1,0,0,BOOKE_PAGESZ_1M)
	.long TLB1_MAS2(((CFG_CCSRBAR_DEFAULT>>12) & 0xfffff),0,0,0,0,1,0,1,0)
	.long TLB1_MAS3(((CFG_CCSRBAR_DEFAULT>>12) & 0xfffff),0,0,0,0,0,1,0,1,0,1)
#else
	.long TLB1_MAS0(1,15,0)
	.long TLB1_MAS1(0,0,0,0,BOOKE_PAGESZ_1M)
	.long TLB1_MAS2(0,0,0,0,0,0,0,0,0)
	.long TLB1_MAS3(0,0,0,0,0,0,1,0,1,0,1)
#endif
	entry_end

/* LAW(Local Access Window) configuration:
 * 0000_0000-8000_0000: Up to 2G DDR
 * f000_0000-f3ff_ffff: PCI(256M)
 * f400_0000-f7ff_ffff: RapidIO(128M)
 * f800_0000-ffff_ffff: localbus(128M)
 *   f800_0000-fbff_ffff: LBC SDRAM(64M)
 *   fc00_0000-fcff_ffff: LBC BCSR (1M, Chip select 1)
 *   fdf0_0000-fdff_ffff: CCSRBAR(1M)
 *   ff00_0000-ffff_ffff: Flash(16M)
 * We don't need a local window for CCSRBAR and flash because they
 * reside in their default mapped spaces.
 */

#define LAWBAR0 0
#define LAWAR0  ((LAWAR_TRGT_IF_DDR | (LAWAR_SIZE & LAWAR_SIZE_2G)) & ~LAWAR_EN)

#define LAWBAR1 ((CFG_PCI_MEM_BASE>>12) & 0xfffff)
#define LAWAR1  (LAWAR_EN | LAWAR_TRGT_IF_PCIX | (LAWAR_SIZE & LAWAR_SIZE_256M))

#if !defined(CONFIG_RAM_AS_FLASH)
#define LAWBAR2 ((CFG_LBC_SDRAM_BASE>>12) & 0xfffff)
#define LAWAR2  (LAWAR_EN | LAWAR_TRGT_IF_LBC | (LAWAR_SIZE & LAWAR_SIZE_128M))
#else
#define LAWBAR2 0
#define LAWAR2 ((LAWAR_TRGT_IF_LBC | (LAWAR_SIZE & LAWAR_SIZE_128M)) & ~LAWAR_EN)
#endif

	.section .bootpg, "ax"
	.globl  law_entry
law_entry:
	entry_start
	.long 0x03
	.long LAWBAR0,LAWAR0,LAWBAR1,LAWAR1,LAWBAR2,LAWAR2
	entry_end