uboot移植.docx

1、uboot移植交叉编译器：4.3.2一、建立自己的开发项目并测试编译目前u-boot对很多cpu直接支持，比如smdk2400、smdk2410、smdk6400，但是没有smdk6410，由于smdk6400与smdk6410硬件资源相近，所以我们选择smdk6400为参照，建立自己的开发项目。1、下载源码、解压从网上ftp:/ftp.denx.de/pub/u-boot/下载u-boot-2010.03.tar.bz2，之所以选择此版本，是因为此版本与三星提供的u-boot.1.1.6相近，降低移植的难度。2、进入board/samsun目录下，会发现有smdk6400文件夹，建立新文件夹

2、smdk6410，并将smdk6400里的所有文件复制到smdk6410中，进入smdk6410文件夹将smdk6400.c更名为smdk6410.c，并且打开此文件，将里面的6400全部改为6410。打开Makfile，将里面的6400改为6410。结束推出到u-boot-2010.03根目录。3、进入到nand_spl/board/sansung/，复制smdk6400，并黏贴，将副本smdk6400更名为smdk6410，更改Makefile文件，将里面的6400全部改成6410。4、进入到 include/configs/ 复制smdk6400.h，并将副本改为smdk6410.h。5

3、、进入到u-boot-2010.03根目录，打开Makefile，将CROSS_COMPILE ?=改成为CROSS_COMPILE ?=arm-linux-，然后搜索6400，会跳转到如下图所示然后复制所有以上代码，并且将6400改成6410，如下图然后运行make smdk6410_config 然后在运行make，若通过则说明此次移植第一步基本成功，但是编译出来的u-boot.bin尚不能用，还要继续深入工作。二、修改启动代码1、首先修改cpu/arm1176/start.s,修改后的代码如下，.globl _start_start: b reset#ifndef CONFIG_NAND

4、_SPL ldr pc, _undefined_instruction ldr pc, _software_interrupt ldr pc, _prefetch_abort ldr pc, _data_abort ldr pc, _not_used ldr pc, _irq ldr pc, _fiq_undefined_instruction: .word undefined_instruction_software_interrupt: .word software_interrupt_prefetch_abort: .word prefetch_abort_data_abort: .wo

5、rd data_abort_not_used: .word not_used_irq: .word irq_fiq: .word fiq_pad: .word 0x12345678 /* now 16*4=64 */#else . = _start + 64#endif.global _end_vect_end_vect: .balignl 16,0xdeadbeef/* Startup Code (reset vector)* do important init only if we dont start from memory!* setup Memory and board specif

6、ic bits prior to relocation.* relocate armboot to ram* setup stack*/_TEXT_BASE: .word TEXT_BASE/* Below variable is very important because we use MMU in U-Boot.* Without it, we cannot run code correctly before MMU is ON.* by scsuh.*/_TEXT_PHY_BASE: .word CONFIG_SYS_PHY_UBOOT_BASE.globl _armboot_star

7、t_armboot_start: .word _start/* These are defined in the board-specific linker script.*/.globl _bss_start_bss_start: .word _bss_start.globl _bss_end_bss_end: .word _end/* the actual reset code*/reset: /* * set the cpu to SVC32 mode */ mrs r0, cpsr bic r0, r0, #0x1f orr r0, r0, #0xd3 msr cpsr, r0/* C

8、PU_init_critical registers* setup important registers* setup memory timing*/ /* * we do sys-critical inits only at reboot, * not when booting from ram! */cpu_init_crit: /* * When booting from NAND - it has definitely been a reset, so, no need * to flush caches and disable the MMU */ /* * flush v4 I/

9、D caches */ mov r0, #0 mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */ mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */ /* * disable MMU stuff and caches */ mrc p15, 0, r0, c1, c0, 0 bic r0, r0, #0x00002300 clear bits 13, 9:8 (-V- -RS) bic r0, r0, #0x00000087 clear bits 7, 2:0 (B- -CAM) orr r0, r0, #0

10、x00000002 set bit 2 (A) Align orr r0, r0, #0x00001000 set bit 12 (I) I-Cache mcr p15, 0, r0, c1, c0, 0 /* Peri port setup */ ldr r0, =0x70000000 orr r0, r0, #0x13 mcr p15,0,r0,c15,c2,4 256M (0x70000000 - 0x7fffffff) /* * Go setup Memory and board specific bits prior to relocation. */ bl lowlevel_ini

11、t /* go setup pll,mux,memory */ /* when we already run in ram, we dont need to relocate U-Boot. * and actually, memory controller must be configured before U-Boot * is running in ram. */ ldr r0, =0xff000fff bic r1, pc, r0 /* r0 - current base addr of code */ ldr r2, _TEXT_BASE /* r1 - original base

12、addr in ram */ bic r2, r2, r0 /* r0 - current base addr of code */ cmp r1, r2 /* compare r0, r1 */ beq after_copy /* r0 = r1 then skip flash copy */#ifdef CONFIG_BOOT_NAND mov r0, #0x1000 bl copy_from_nand#endifafter_copy:#ifdef CONFIG_ENABLE_MMUenable_mmu: /* enable domain access */ ldr r5, =0x0000

13、ffff mcr p15, 0, r5, c3, c0, 0 /* load domain access register */ /* Set the TTB register */ ldr r0, _mmu_table_base ldr r1, =CONFIG_SYS_PHY_UBOOT_BASE ldr r2, =0xfff00000 bic r0, r0, r2 orr r1, r0, r1 mcr p15, 0, r1, c2, c0, 0 /* Enable the MMU */mmu_on: mrc p15, 0, r0, c1, c0, 0 orr r0, r0, #1 /* S

14、et CR_M to enable MMU */ mcr p15, 0, r0, c1, c0, 0 nop nop nop nop#endifskip_hw_init: /* Set up the stack */stack_setup:#ifdef CONFIG_MEMORY_UPPER_CODE ldr sp, =(CONFIG_SYS_UBOOT_BASE + CONFIG_SYS_UBOOT_SIZE - 0xc)#else ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */ sub r0, r0, #CONFIG_SYS_

15、MALLOC_LEN /* malloc area */ sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE/* bdinfo */#ifdef CONFIG_USE_IRQ sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)#endif sub sp, r0, #12 /* leave 3 words for abort-stack */#endifclear_bss: ldr r0, _bss_start /* find start of bss segment */ ldr r1, _bss_end /

16、* stop here */ mov r2, #0 /* clear */clbss_l: str r2, r0 /* clear loop. */ add r0, r0, #4 cmp r0, r1 ble clbss_l ldr pc, _start_armboot_start_armboot: .word start_armboot#ifdef CONFIG_ENABLE_MMU_mmu_table_base: .word mmu_table#endif/* copy U-Boot to SDRAM and jump to ram (from NAND or OneNAND)* r0:

17、size to be compared* Load 1st 2blocks to RAM because U-boots size is larger than 1block(128k) size*/ .globl copy_from_nandcopy_from_nand: mov r10, lr /* save return address */ mov r9, r0 /* get ready to call C functions */ ldr sp, _TEXT_PHY_BASE /* setup temp stack pointer */ sub sp, sp, #12 mov fp,

18、 #0 /* no previous frame, so fp=0 */ mov r9, #0x1000 bl copy_uboot_to_ram /此函数需要添加，稍后说明。3: tst r0, #0x0 bne copy_failed ldr r0, =0x0c000000 ldr r1, _TEXT_PHY_BASE1: ldr r3, r0, #4 ldr r4, r1, #4 teq r3, r4 bne compare_failed /* not matched */ subs r9, r9, #4 bne 1b4: mov lr, r10 /* all is OK */ mov

19、pc, lrcopy_failed: nop /* copy from nand failed */ b copy_failedcompare_failed: nop /* compare failed */ b compare_failed/* we assume that cache operation is done before. (eg. cleanup_before_linux()* actually, we dont need to do anything about cache if not use d-cache in* U-Boot. So, in this functio

20、n we clean only MMU. by scsuh* void theLastJump(void *kernel, int arch_num, uint boot_params);*/#ifdef CONFIG_ENABLE_MMU .globl theLastJumptheLastJump: mov r9, r0 ldr r3, =0xfff00000 ldr r4, _TEXT_PHY_BASE adr r5, phy_last_jump bic r5, r5, r3 orr r5, r5, r4 mov pc, r5phy_last_jump: /* * disable MMU

21、stuff */ mrc p15, 0, r0, c1, c0, 0 bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (-V- -RS) */ bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B- -CAM) */ orr r0, r0, #0x00000002 /* set bit 2 (A) Align */ orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */ mcr p15, 0, r0, c1, c0, 0 mcr p15, 0, r0, c8,

22、 c7, 0 /* flush v4 TLB */ mov r0, #0 mov pc, r9#endif/* Interrupt handling*/ IRQ stack frame.#define S_FRAME_SIZE 72#define S_OLD_R0 68#define S_PSR 64#define S_PC 60#define S_LR 56#define S_SP 52#define S_IP 48#define S_FP 44#define S_R10 40#define S_R9 36#define S_R8 32#define S_R7 28#define S_R6

23、24#define S_R5 20#define S_R4 16#define S_R3 12#define S_R2 8#define S_R1 4#define S_R0 0#define MODE_SVC 0x13#define I_BIT 0x80/* use bad_save_user_regs for abort/prefetch/undef/swi .*/ .macro bad_save_user_regs /* carve out a frame on current user stack */ sub sp, sp, #S_FRAME_SIZE /* Save user re

24、gisters (now in svc mode) r0-r12 */ stmia sp, r0 - r12 ldr r2, _armboot_start sub r2, r2, #(CONFIG_SYS_MALLOC_LEN) /* set base 2 words into abort stack */ sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) /* get values for aborted pc and cpsr (into parm regs) */ ldmia r2, r2 - r3 /* grab pointer to old stac

25、k */ add r0, sp, #S_FRAME_SIZE add r5, sp, #S_SP mov r1, lr /* save sp_SVC, lr_SVC, pc, cpsr */ stmia r5, r0 - r3 /* save current stack into r0 (param register) */ mov r0, sp save current stack into r0 (param register) .endm .macro irq_save_user_regs sub sp, sp, #S_FRAME_SIZE stmia sp, r0 - r12 Call

26、ing r0-r12 add r8, sp, #S_PC ! R8 NEEDS to be saved ! a reserved stack spot would be good. stmdb r8, sp, lr Calling SP, LR str lr, r8, #0 Save calling PC mrs r6, spsr str r6, r8, #4 Save CPSR str r0, r8, #8 Save OLD_R0 mov r0, sp .endm .macro irq_restore_user_regs ldmia sp, r0 - lr Calling r0 - lr m

27、ov r0, r0 ldr lr, sp, #S_PC Get PC add sp, sp, #S_FRAME_SIZE subs pc, lr, #4 return & move spsr_svc into cpsr .endm .macro get_bad_stack /* setup our mode stack (enter in banked mode) */ ldr r13, _armboot_start /* move past malloc pool */ sub r13, r13, #(CONFIG_SYS_MALLOC_LEN) /* move to reserved a

28、couple spots for abort stack */ sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE + 8) /* save caller lr in position 0 of saved stack */ str lr, r13 /* get the spsr */ mrs lr, spsr /* save spsr in position 1 of saved stack */ str lr, r13, #4 /* prepare SVC-Mode */ mov r13, #MODE_SVC msr spsr_c, r13 /* switch modes, make sure moves will execute */ msr spsr, r13 /* captu