我也遇到了類似的問題~ 我的板子是AT2440EVB-II使用s3c2440的soc~ bootloader是我自己寫的~(第一次寫bootloader...@@) 我已經可以boot到如下的畫面了~ 可是在booting the kernel的時候~就卡住了 我的console顯示如下: Uncompressing Linux................................. done, booting the kernel. 到此處就永遠停住不動了~ 請問各位大大~這有可能是什麼原因呢? 我附上我的程式碼給大家參考好了~ 問題是出在初始化DRAM controller的參數不對嗎? 還是我copy memory超出範圍? 還是其他CPU的參數設定不對? 我是將boot loader燒到0x0的位址~ Linux kernel燒到0x10000的位址~ kernel的大小約為1.4Mb~ boot loader會將之拷貝到0x30030000的位址執行~ 板子的規格書上寫NOR flash是2Mb~SDRAM是64Mb~ 我找了很久找不出原因..非常感謝各位大大的幫忙!....@@ ======================================================================== 檔名: start_vector.S # define pWTCON 0x53000000 # define INTMSK 0x4A000008 /* Interupt-Controller base addresses */ # define INTSUBMSK 0x4A00001C # define CLKDIVN 0x4C000014 /* clock divisor register */ .global _start _start: b reset 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: b _undefined_instruction _software_interrupt: b _software_interrupt _prefetch_abort: b _prefetch_abort _data_abort: b _data_abort _not_used: b _not_used _irq: b _irq _fiq: b _fiq reset: /* * set the cpu to SVC32 mode */ mrs r0,cpsr bic r0,r0,#0x1f orr r0,r0,#0xd3 msr cpsr,r0 ldr r0, =pWTCON mov r1, #0x0 str r1, [r0] turn_off_interrupt: mov r1, #0xffffffff ldr r0, =INTMSK str r1, [r0] ldr r1, =0x7fff ldr r0, =INTSUBMSK str r1, [r0] setup_clock: ldr r0, =CLKDIVN mov r1, #0x7 str r1, [r0] mrc p15, 0, r0, c1, c0, 0 orr r0, r0, #(1<<31 | 1<<30) mcr p15, 0, r0, c1, c0, 0 sdram_init: ldr r0, =0x48000000 ldr r1, =(0x2 << 28 | 0x2 << 24 | 0x1 << 1) str r1,[r0] ldr r0, =0x48000004 mov r1, #0x00000700 str r1,[r0] ldr r0, =0x48000008 mov r1, #0x00000700 str r1,[r0] ldr r0, =0x4800000C mov r1, #0x00000700 str r1,[r0] ldr r0, =0x48000010 mov r1, #0x00000700 str r1,[r0] ldr r0, =0x48000014 mov r1, #0x00000700 str r1,[r0] ldr r0, =0x48000018 mov r1, #0x00000700 str r1,[r0] ldr r0, =0x4800001c ldr r1, =(0x3 <<15 | 1<<2 |1) str r1, [r0] ldr r0, =0x48000020 ldr r1, =(0x3 <<15 | 1<<2 |1) str r1,[r0] ldr r0, =0x48000024 mov r1, #(1<<23 | 3 <<18) str r1, [r0] ldr r0, =0x48000028 mov r1, #(1<<5 | 1 <<4 | 1) str r1, [r0] ldr r0, =0x4800002c mov r1, #0x30 str r1, [r0] ldr r0, =0x48000030 mov r1, #0x30 str r1, [r0] ldr sp,=0x33ff0000 ldr pc,_start_armboot _start_armboot: .word start_armboot ============================================================ 檔名: main.c #define GPBCON ((volatile unsigned *)0x56000010) #define GPBDAT ((volatile unsigned *)0x56000014) #define GPBUP ((volatile unsigned *)0x56000018) #define GPHCON ((volatile unsigned *)0x56000070) #define GPHDAT ((volatile unsigned *)0x56000074) #define GPHUP ((volatile unsigned *)0x56000078) #define UPLLCON ((volatile unsigned *)0x4C000008) #define MPLLCON ((volatile unsigned *)0x4C000004) #define CLKDIVN ((volatile unsigned *)0x4C000014) #define CAMDIVN ((volatile unsigned *)0x4C000018) #define LED1_ON() (*GPBDAT &= ~(0x1)) #define LED2_ON() (*GPBDAT &= ~(0x2)) #define LED1_OFF() (*GPBDAT |= (0x1)) #define LED2_OFF() (*GPBDAT |= (0x2)) void delay(int time) { int i; for( i = 0; i < time; i ++); } void __div0() { while(1); } #define MDIV 0x6e #define PDIV 0x3 #define SDIV 0x1 #define CONFIG_SYS_CLK_FREQ 16934400 /* AT2440-II uses a 16.9344MHz oscillator.*/ void setup_clock() { *MPLLCON = (MDIV<<12)+(PDIV<<4)+(SDIV); } void setup_serial() { unsigned volatile long *ULCON,*UCON,*UFCON,*UMCON,*UBRDIV; unsigned int Fin; unsigned int MPLL; unsigned int reg; Fin=CONFIG_SYS_CLK_FREQ; MPLL=2*(Fin)*(MDIV+8)/(PDIV+2)/(2); reg = (MPLL/6) / (16* 115200) -1; UFCON=(unsigned long *)0x50000008; *(UFCON)=0x7; /*enble FIFO*/ UMCON=(unsigned long *)0x5000000C; *(UMCON)=0x0; ULCON=(unsigned long *)0x50000000; *(ULCON)=(( 0<<3)|(0)<<2|3); /* 8-n-1 */ UCON=(unsigned long *)0x50000004; *(UCON)=0x5; UBRDIV=(unsigned long *)0x50000028; *(UBRDIV)=reg; /* gpio UART0 init */ *GPHCON=0xAA; *GPHUP=0x7ff; delay(0xffff); } void putc(const char c) { unsigned volatile long *UTRSTAT; unsigned volatile char *UTXH; UTRSTAT=(unsigned long*)0x50000010; while( !(*UTRSTAT & 0x2)); UTXH=(unsigned char *)0x50000020; *UTXH=c; } int getc (void) { unsigned volatile long *UTRSTAT; unsigned volatile char *URXH; UTRSTAT=(unsigned long*)0x50000010; URXH=(unsigned char*)0x50000024; while (!(*UTRSTAT & 0x1)); return (*URXH) & 0xff; } void putstr(char *p) { while(*p!=0) { putc(*p); p++; } putc('\r'); } /* See also ARM920T Technical reference Manual */ #define C1_MMU (1<<0) /* mmu off/on */ #define C1_ALIGN (1<<1) /* alignment faults off/on */ #define C1_DC (1<<2) /* dcache off/on */ #define C1_BIG_ENDIAN (1<<7) /* big endian off/on */ #define C1_SYS_PROT (1<<8) /* system protection */ #define C1_ROM_PROT (1<<9) /* ROM protection */ #define C1_IC (1<<12) /* icache off/on */ #define C1_HIGH_VECTORS (1<<13) /* location of vectors: low/high addresses */ int cleanup_before_linux (void) { /* * this function is called just before we call linux * it prepares the processor for linux * * we turn off caches etc ... */ unsigned long i; /* turn off I/D-cache */ asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); i &= ~(C1_DC | C1_IC); asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i)); /* flush I/D-cache */ i = 0; asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i)); return (0); } void cp_mem() { unsigned long *dst; unsigned long *src; int (*f)(void *); dst=(unsigned long *)0x30030000; src=(unsigned long *)0x10000; while (src < (unsigned long *)0x200000) { *dst = *src; dst++; src++; } cleanup_before_linux(); putstr("image ready, any key continue\n"); getc(); f=(int *)0x30030000; f(1); } void start_armboot (void) { setup_clock(); setup_serial(); putstr("Hello\n"); putstr("Any key to continue\n"); getc(); putstr("Yes\n"); cp_mem(); } --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.160.188.71 ※ 編輯: BlueAlaska 來自: 218.160.188.71 (03/03 01:19) ※ 編輯: BlueAlaska 來自: 218.160.188.71 (03/03 01:20)