s5pv210 uboot-2012-10移植(二) 之能够启动进入控制台

这次我们将从官网下载的最新uboot-2012-10移植到s5pv210开发板上,让其进入控制台,效果如下:


首先,我暂时没采用内核的SPL,这个将在后面给补上,这里的BL1是我自己参考资料写的,我用的是QT210开发板,内存1G,对于不同的开发板,需要重新配置memory和修改uboot在内存里的地址,也就是CONFIG_SYS_TEXT_BASE。我的BL1代码在这里下载。

一、添加smdkv210单板

1.cp -a board/samsung/smdkc100 board/samsung/smdkv210

2.cp include/configs/smdkc100.h include/configs/smdkv210.h

3.vim boards.cfg,在270行添加

270 smdkv210                     arm         armv7       smdkv210            samsung        s5pc1xx

4.make smdkv210_config可以生成u-boot.bin了

二、让u-boot.bin在内存里启动起来

1.分析我的BL1代码可以得知,只拷贝了u-boot.bin,并没有清楚bss,在ls arch/arm/cpu/armv7/start.S +126中添加

reset:
	//by ZheGao clear bss
	ldr	r0, =__bss_start
	ldr	r1, =__bss_end__
	mov r2, #0x0
1:
	str r2, [r0], #4
	cmp r0, r1
	bne 1b
	//end of clear bss

	bl	save_boot_params
2.在BL0已经关了看门狗,在BL1里已经初始化了memory和串口,修改board/samsung/smdkv210/lowlevel_init.S +39中给屏蔽

.globl lowlevel_init
lowlevel_init:
	mov	r9, lr
#if 0
	/* r5 has always zero */
	mov	r5, #0

	ldr	r8, =S5PC100_GPIO_BASE

	/* Disable Watchdog */
	ldr	r0, =S5PC100_WATCHDOG_BASE		@0xEA200000
	orr	r0, r0, #0x0
	str	r5, [r0]

	/* setting SRAM */
	ldr	r0, =S5PC100_SROMC_BASE
	ldr	r1, =0x9
	str	r1, [r0]

	/* S5PC100 has 3 groups of interrupt sources */
	ldr	r0, =S5PC100_VIC0_BASE			@0xE4000000
	ldr	r1, =S5PC100_VIC1_BASE			@0xE4000000
	ldr	r2, =S5PC100_VIC2_BASE			@0xE4000000

	/* Disable all interrupts (VIC0, VIC1 and VIC2) */
	mvn	r3, #0x0
	str	r3, [r0, #0x14]				@INTENCLEAR
	str	r3, [r1, #0x14]				@INTENCLEAR
	str	r3, [r2, #0x14]				@INTENCLEAR

	/* Set all interrupts as IRQ */
	str	r5, [r0, #0xc]				@INTSELECT
	str	r5, [r1, #0xc]				@INTSELECT
	str	r5, [r2, #0xc]				@INTSELECT

	/* Pending Interrupt Clear */
	str	r5, [r0, #0xf00]			@INTADDRESS
	str	r5, [r1, #0xf00]			@INTADDRESS
	str	r5, [r2, #0xf00]			@INTADDRESS

	/* for UART */
	bl uart_asm_init

	/* for TZPC */
	bl tzpc_asm_init

1:
#endif
	mov	lr, r9
	mov	pc, lr
3.修改第一步的sp指针,在include/configs/smdkv210.h +228修改

//#define CONFIG_SYS_INIT_SP_ADDR	(CONFIG_SYS_LOAD_ADDR - 0x1000000)
#define CONFIG_SYS_INIT_SP_ADDR	(0x30000000)
4.修改board/samsung/smdkv210/smdkc100.c +80

int checkboard(void)
{
	printf("Board:\tSMDKv210\n");
	return 0;
}
5.修改include/configs/smdkv210.h +51
//#define CONFIG_SYS_SDRAM_BASE		0x30000000
#define CONFIG_SYS_SDRAM_BASE		0x20000000
6.修改include/configs/smdkv210.h +189

//#define PHYS_SDRAM_1_SIZE	(128 << 20)	/* 0x8000000, 128 MB Bank #1 */
#define PHYS_SDRAM_1_SIZE	(0x40000000)	/* 0x8000000, 128 MB Bank #1 */
7.修改board/samsung/smdkv210/config.mk +16

CONFIG_SYS_TEXT_BASE = 0x5ff00000
8.修改 arch/arm/config.mk +88

#LDFLAGS_u-boot += -pie

9.修改include/configs/smdkv210.h +216

//#define CONFIG_ENV_IS_IN_ONENAND	1
#define CONFIG_ENV_IS_NOWHERE

10.修改arch/arm/lib/board.c +384

//addr -= gd->mon_len;
addr = 0x5ff00000;

11.因为bl1已经复制程序到指定的地址就不需要重新定位代码了,但还是需要重新设置栈,所以修改了上面的第8步,修改arch/arm/cpu/armv7/start.S +192

ENTRY(relocate_code)
	mov	r4, r0	/* save addr_sp */
	mov	r5, r1	/* save addr of gd */
	mov	r6, r2	/* save addr of destination */

#if 0
	//debug
	ldr r0, =0xE0200C00
	ldr r1, =0x1111
	str r1, [r0]
	
	ldr r0, =0xE0200C04
	ldr r1, =(7)
	str r1, [r0]	
#endif

	mov sp, r4
	mov r0, r5
	mov r1, r6

	bl board_init_r
#if 0
	/* Set up the stack						    */
stack_setup:
	mov	sp, r4

	adr	r0, _start
	cmp	r0, r6
	moveq	r9, #0		/* no relocation. relocation offset(r9) = 0 */
	beq	clear_bss		/* skip relocation */
	mov	r1, r6			/* r1 <- scratch for copy_loop */
	ldr	r3, _image_copy_end_ofs
	add	r2, r0, r3		/* r2 <- source end address	    */

copy_loop:
	ldmia	r0!, {r9-r10}		/* copy from source address [r0]    */
	stmia	r1!, {r9-r10}		/* copy to   target address [r1]    */
	cmp	r0, r2			/* until source end address [r2]    */
	blo	copy_loop

	/*
	 * fix .rel.dyn relocations
	 */
	ldr	r0, _TEXT_BASE		/* r0 <- Text base */
	sub	r9, r6, r0		/* r9 <- relocation offset */
	ldr	r10, _dynsym_start_ofs	/* r10 <- sym table ofs */
	add	r10, r10, r0		/* r10 <- sym table in FLASH */
	ldr	r2, _rel_dyn_start_ofs	/* r2 <- rel dyn start ofs */
	add	r2, r2, r0		/* r2 <- rel dyn start in FLASH */
	ldr	r3, _rel_dyn_end_ofs	/* r3 <- rel dyn end ofs */
	add	r3, r3, r0		/* r3 <- rel dyn end in FLASH */
fixloop:
	ldr	r0, [r2]		/* r0 <- location to fix up, IN FLASH! */
	add	r0, r0, r9		/* r0 <- location to fix up in RAM */
	ldr	r1, [r2, #4]
	and	r7, r1, #0xff
	cmp	r7, #23			/* relative fixup? */
	beq	fixrel
	cmp	r7, #2			/* absolute fixup? */
	beq	fixabs
	/* ignore unknown type of fixup */
	b	fixnext
fixabs:
	/* absolute fix: set location to (offset) symbol value */
	mov	r1, r1, LSR #4		/* r1 <- symbol index in .dynsym */
	add	r1, r10, r1		/* r1 <- address of symbol in table */
	ldr	r1, [r1, #4]		/* r1 <- symbol value */
	add	r1, r1, r9		/* r1 <- relocated sym addr */
	b	fixnext
fixrel:
	/* relative fix: increase location by offset */
	ldr	r1, [r0]
	add	r1, r1, r9
fixnext:
	str	r1, [r0]
	add	r2, r2, #8		/* each rel.dyn entry is 8 bytes */
	cmp	r2, r3
	blo	fixloop
	b	clear_bss
_rel_dyn_start_ofs:
	.word __rel_dyn_start - _start
_rel_dyn_end_ofs:
	.word __rel_dyn_end - _start
_dynsym_start_ofs:
	.word __dynsym_start - _start

clear_bss:
	ldr	r0, _bss_start_ofs
	ldr	r1, _bss_end_ofs
	mov	r4, r6			/* reloc addr */
	add	r0, r0, r4
	add	r1, r1, r4
	mov	r2, #0x00000000		/* clear			    */

clbss_l:cmp	r0, r1			/* clear loop... */
	bhs	clbss_e			/* if reached end of bss, exit */
	str	r2, [r0]
	add	r0, r0, #4
	b	clbss_l
clbss_e:

/*
 * We are done. Do not return, instead branch to second part of board
 * initialization, now running from RAM.
 */
jump_2_ram:
/*
 * If I-cache is enabled invalidate it
 */
#ifndef CONFIG_SYS_ICACHE_OFF
	mcr	p15, 0, r0, c7, c5, 0	@ invalidate icache
	mcr     p15, 0, r0, c7, c10, 4	@ DSB
	mcr     p15, 0, r0, c7, c5, 4	@ ISB
#endif
/*
 * Move vector table
 */
#if !defined(CONFIG_TEGRA20)
	/* Set vector address in CP15 VBAR register */
	ldr     r0, =_start
	add     r0, r0, r9
	mcr     p15, 0, r0, c12, c0, 0  @Set VBAR
#endif /* !Tegra20 */

	ldr	r0, _board_init_r_ofs
	adr	r1, _start
	add	lr, r0, r1
	add	lr, lr, r9
	/* setup parameters for board_init_r */
	mov	r0, r5		/* gd_t */
	mov	r1, r6		/* dest_addr */
	/* jump to it ... */
	mov	pc, lr

_board_init_r_ofs:
	.word board_init_r - _start
#endif
ENDPROC(relocate_code)
#endif


重新make一下,使用下面命令烧写到sd卡里,插入开发板启动即可,看看上面的启动信息,还有很多很多地方要完善~

dd iflag=dsync oflag=dsync if=blSD.bin of=/dev/sdb seek=1
dd iflag=dsync oflag=dsync if=u-boot.bin of=/dev/sdb seek=49

                                                                                                                                                   



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