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_params2.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, lr3.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 0x200000006.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 = 0x5ff000008.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
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