mini6410移植全攻略（5）--uboot移植之支持nand flansh启动(下)

六、首先运行的程序

在这我也进行的大量的代码修改，进行了详细的注释，希望给大家一些帮助

本文章由muge0913编写，文章仅供技术交流，转载请注明出处：

http://blog.csdn.net/muge0913/article/details/7168366

#include <config.h> #include <version.h> #ifdef CONFIG_ENABLE_MMU #include <asm/proc/domain.h> #endif /*添加头文件*/ #include <asm/arch/s3c6400.h> #if !defined(CONFIG_ENABLE_MMU) && !defined(CONFIG_SYS_PHY_UBOOT_BASE) #define CONFIG_SYS_PHY_UBOOT_BASE CONFIG_SYS_UBOOT_BASE #endif /* ************************************************************************* * * Jump vector table as in table 3.1 in [1] * ************************************************************************* */ .globl _start _start: b reset #ifndef CONFIG_NAND_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: .word 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 don't start from memory! * setup Memory and board specific 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_start _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, #0x3f orr r0, r0, #0xd3 msr cpsr, r0 /* ************************************************************************* * * CPU_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/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, #0x00000002 @ set bit 2 (A) Align orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache /* Prepare to disable the MMU */ /* Peri port setup */ /* 以下代码的作用是为了给256M的内存在MMU开启的时候把0x70000000作为重映射的基地址*/ ldr r0, =0x70000000 orr r0, r0, #0x13 mcr p15,0,r0,c15,c2,4 @ 256M(0x70000000-0x7fffffff) #ifdef CONFIG_DISABLE_TCM /* * Disable the TCMs */ mrc p15, 0, r0, c0, c0, 2 /* Return TCM details */ cmp r0, #0 beq skip_tcmdisable mov r1, #0 mov r2, #1 tst r0, r2 mcrne p15, 0, r1, c9, c1, 1 /* Disable Instruction TCM if present*/ tst r0, r2, LSL #16 mcrne p15, 0, r1, c9, c1, 0 /* Disable Data TCM if present*/ skip_tcmdisable: #endif /* * Go setup Memory and board specific bits prior to relocation. */ bl lowlevel_init /* go setup pll,mux,memory */ /*判断程序是否已经在ram中了，在的话就不拷贝，直接跳转到after_copy了，否则继续执行下面的代码*/ ldr r0, =0xff000fff bic r1, pc, r0 /* r0 <- current base addr of code */ ldr r2, _TEXT_BASE /* r1 <- original base 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 /*如果是以CONFIG_BOOT_NAND方式启动开发板的，则执行以下代码否则跳过*/ mov r0, #0x1000 /*把代码搬运到内存中*/ bl copy_from_nand #endif after_copy: ldr r0, =ELFIN_GPIO_BASE ldr r1, =0xC00 str r1, [r0, #GPPDAT_OFFSET] ldr r1, [r0, #GPFPUD_OFFSET] bic r1, r1, #0xc0000000 orr r1, r1, #0x80000000 str r1, [r0, #GPFPUD_OFFSET] ldr r1, [r0, #GPFDAT_OFFSET] orr r1, r1, #0x8000 str r1, [r0, #GPFDAT_OFFSET] ldr r1, [r0, #GPFCON_OFFSET] bic r1, r1, #0xc0000000 orr r1, r1, #0x40000000 str r1, [r0, #GPFCON_OFFSET] #ifdef CONFIG_ENABLE_MMU enable_mmu: /* enable domain access */ ldr r5, =0x0000ffff 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 */ mrc p15, 0, r0, c1, c0, 0 orr r0, r0, #1 /* Set CR_M to enable MMU */ /* Prepare to enable the MMU */ adr r1, skip_hw_init and r1, r1, #0x3fc ldr r2, _TEXT_BASE ldr r3, =0xfff00000 and r2, r2, r3 orr r2, r2, r1 b mmu_enable .align 5 /* Run in a single cache-line */ mmu_enable: mcr p15, 0, r0, c1, c0, 0 nop nop mov pc, r2 #endif skip_hw_init: stack_setup: #ifdef CONFIG_MEMORY_UPPER_CODE ldr sp, =(CONFIG_SYS_PHY_UBOOT_BASE + CONFIG_SYS_UBOOT_SIZE - 0xc) #else ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */ sub r0, r0, #CFG_MALLOC_LEN /* malloc area */ sub r0, r0, #CFG_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 */ #endif clear_bss: /*清零BSS段内容为0*/ ldr r0, _bss_start /* find start of bss segment */ ldr r1, _bss_end /* stop here */ mov r2, #0x00000000 /* clear */ clbss_l: str r2, [r0] /* clear loop... */ add r0, r0, #4 cmp r0, r1 ble clbss_l /* Set up the stack */ //stack_setup: // ldr r0, =CONFIG_SYS_UBOOT_BASE /* base of copy in DRAM */ // sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */ // sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */ // sub sp, r0, #12 /* leave 3 words for abort-stack */ // bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ //clear_bss: // ldr r0, _bss_start /* find start of bss segment */ // ldr r1, _bss_end /* stop here */ // mov r2, #0 /* clear */ //clbss_l: // str r2, [r0] /* clear loop... */ // add r0, r0, #4 // cmp r0, r1 // ble clbss_l #ifndef CONFIG_NAND_SPL ldr r0,=ELFIN_GPIO_BASE ldr r1,[r0,#GPKCON0_OFFSET] mov r2,#0x11 mov r1,r2,lsl #24 mov r2,#0x11 mov r1,r2,lsl #16 str r1,[r0,#GPKCON0_OFFSET] ldr r1,[r0,#GPKPUD_OFFSET] mov r2,#0xffff00ff and r1,r2 str r1,[r0,#GPKPUD_OFFSET] mov r1,#0xC0 str r1,[r0,#GPKDAT_OFFSET] ldr pc, _start_armboot _start_armboot: .word start_armboot #else b nand_boot /* .word nand_boot*/ #endif #ifdef CONFIG_ENABLE_MMU _mmu_table_base: .word mmu_table #endif /*添加拷贝代码*/ .globl copy_from_nand copy_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, #0 /* no previous frame, so fp=0 */ mov r9, #0x1000 bl copy_uboot_to_ram 3: tst r0, #0x0 bne copy_failed ldr r0, =0x0c000000 ldr r1, _TEXT_PHY_BASE 1: ldr r3, [r0], #4 ldr r4, [r1], #4 teq r3, r4 bne compare_failed /* not matched */ subs r9, r9, #4 bne 1b 4: mov lr, r10 /* all is OK */ mov pc, lr copy_failed: nop /* copy from nand failed */ b copy_failed compare_failed: nop /* compare failed */ b compare_failed #ifndef CONFIG_NAND_SPL /* * we assume that cache operation is done before. (eg. cleanup_before_linux()) * actually, we don't need to do anything about cache if not use d-cache in * U-Boot. So, in this function we clean only MMU. by scsuh * * void theLastJump(void *kernel, int arch_num, uint boot_params); */ #ifdef CONFIG_ENABLE_MMU .globl theLastJump theLastJump: 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, r5 phy_last_jump: /* * disable MMU 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, 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 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 registers (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 stack */ 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 .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 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 /* capture return pc */ mov lr, pc /* jump to next instruction & switch modes. */ movs pc, lr .endm .macro get_bad_stack_swi /* space on current stack for scratch reg. */ sub r13, r13, #4 /* save R0's value. */ str r0, [r13] /* get data regions start */ ldr r0, _armboot_start /* move past malloc pool */ sub r0, r0, #(CONFIG_SYS_MALLOC_LEN) /* move past gbl and a couple spots for abort stack */ sub r0, r0, #(CONFIG_SYS_GBL_DATA_SIZE + 8) /* save caller lr in position 0 of saved stack */ str lr, [r0] /* get the spsr */ mrs r0, spsr /* save spsr in position 1 of saved stack */ str lr, [r0, #4] /* restore r0 */ ldr r0, [r13] /* pop stack entry */ add r13, r13, #4 .endm /* * exception handlers */ .align 5 undefined_instruction: get_bad_stack bad_save_user_regs bl do_undefined_instruction .align 5 software_interrupt: get_bad_stack_swi bad_save_user_regs bl do_software_interrupt .align 5 prefetch_abort: get_bad_stack bad_save_user_regs bl do_prefetch_abort .align 5 data_abort: get_bad_stack bad_save_user_regs bl do_data_abort .align 5 not_used: get_bad_stack bad_save_user_regs bl do_not_used .align 5 irq: get_bad_stack bad_save_user_regs bl do_irq .align 5 fiq: get_bad_stack bad_save_user_regs bl do_fiq #endif /* CONFIG_NAND_SPL */

七、最终效果（因为打印的信息较多，截图不方便，以文字的形式给出）

U-Boot 2010.09 (Dec 31 2011 - 12:27:41) for th6410

CPU:s3c6410@533MHz

Fclk =533MHz, Hclk = 133MHz, Pclk = 66MHz (ASYNC Mode)

Board: th6410

DRAM: 0Bytes<NULL>

Flash: 0 Bytes<NULL>NAND: NAND device: Manufacturer ID: 0xec, Chip ID:0xd5 (Samsung NAND 2GiB 3,3V 8-bit)

NAND bus width 8 instead 16 bit

No NAND device found!!!

0 MiB

*** Warning - bad CRC, using default environment

In: serial

Out: serial

Err: serial

Net: CS8900-0

Hit any key to stop autoboot: 3

no devices available

Wrong Image Format for bootm command

ERROR: can't get kernel image!

muge0913-张同浩#

本文章由muge0913编写，文章仅供技术交流，转载请注明出处：

http://blog.csdn.net/muge0913/article/details/7168366

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