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ARM裸板调试之串口打印及栈初步分析

2022-06-26 18:19:00 【陈洪伟】

前面介绍的点灯调试法提供的信息并不多，接下来我们看串口调试方法，先看一下结构

然后我们仍然用之前的nandflash来实验，nandflash前面一块代码不是用位置无关码写的，运行时会报错，我们用串口调试下。

1 编写打印代码

正常需要自己写串口相关代码，这里直接把之前串口实验的代码复制过来，这里注意一个问题，由于我们head.S前面的代码还没有把时钟提高到50MHz,所以这里波特率不能支持到115200，只能到57600，

#define TXD0READY   (1<<2)
#define RXD0READY   (1)

#define PCLK            12000000
#define UART_CLK        PCLK        //  UART0的时钟源设为PCLK
#define UART_BAUD_RATE  57600      // 波特率
#define UART_BRD        ((UART_CLK  / (UART_BAUD_RATE * 16)) - 1)

/*
 * 初始化UART0
 * 57600,8N1,无流控
 */
void uart0_init(void)
{
    GPHCON  |= 0xa0;    // GPH2,GPH3用作TXD0,RXD0
    GPHUP   = 0x0c;     // GPH2,GPH3内部上拉

    ULCON0  = 0x03;     // 8N1(8个数据位，无较验，1个停止位)
    UCON0   = 0x05;     // 查询方式，UART时钟源为PCLK
    UFCON0  = 0x00;     // 不使用FIFO
    UMCON0  = 0x00;     // 不使用流控
    UBRDIV0 = UART_BRD; // 波特率为115200
}

/*
 * 发送一个字符
 */
void putc(unsigned char c)
{
    /* 等待，直到发送缓冲区中的数据已经全部发送出去 */
    while (!(UTRSTAT0 & TXD0READY));
    
    /* 向UTXH0寄存器中写入数据，UART即自动将它发送出去 */
    UTXH0 = c;
}

void puts(char *s)
{
	int i = 0;
	while (s[i])
	{
		putc(s[i]);
		i++;
	}
}

void puthex(unsigned long val)
{
	/* val = 0x1234ABCD */
	unsigned char c;
	int i = 0;
	
	putc('0');
	putc('x');

	for (i = 0; i < 8; i++)
	{
		c = (val >> ((7-i)*4)) & 0xf;
		if ((c >= 0) && (c <= 9))
		{
			c = '0' + c;
		}
		else if ((c >= 0xA) && (c <= 0xF))
		{
			c = 'A' + (c -  0xA);
		}
		putc(c);
	}
}

然后我们就可以在head.S中使用putc函数进行打印了，汇编调用C语言函数的时候，第一个参数是保存在r0里面的，

打印出来发现输出的是mnm，多输出了一个m,说明程序已经跑飞了，我们再加一行打印，

正常应该会输出mnro，结果还是输出mnm，说明输出完n之后，程序就重启了，那错误可能就在nand_init或者memsetup这两个函数里面，那我们先把nand_init注释掉，

注释掉之后发现打印出来mnrm，那我们现在直接在memsetup里面增加打印，

然后发现打印的乱七八糟的

这是什么原因，还不清楚，如果打印字符串，字符串不一定保存在哪里(有可能保存在SDRAM里面，而打印的时候SDRAM还没有初始化)，继续改调试代码，改为

然后编译下载，

从打印看没有打印出来O，好像是 nandread那里崩溃了，(其实是memsetup这个函数，这个串口打印调试在这个错误上并不好用)，

其实错误是在memsetup这里，假如我们怀疑memsetup函数，我们去调试memsetup函数，我们写内存，我们把K写进去再读出来，打印出来，如果还是K那么表明内存K是可写的，表明SDRAM初始化没问题，

编译下载发现还是有K(越调试越晕，memsetup怎么没问题了。。。命名之前我们写的程序错误就在memsetup函数里面)，

那我们继续，把SDRAM的寄存器打印出来，

打印结果如下

打印结果明显不是寄存器内容，这是因为访问内存mem_cfg_val的时候用的是他的内存地址，

再改

打印结果如下：

那打印可能有点问题，可能puthex这个打印函数不对。。。。。先测试下puthex

测试发现这个puthex函数没问题，

那么我们的打印就没问题，那&mem_cfg_val的地址是FB0(4016)，FB4, FB8，按说这个地址应该是链接地址才对，为什么是在前面4096里面呢，sp栈地址是4096，

看一下反汇编吧，


nand_elf:     file format elf32-littlearm

Disassembly of section .text:

30000000 <_start>:
30000000:	e3a0da01 	mov	sp, #4096	; 0x1000
30000004:	eb000013 	bl	30000058 <disable_watch_dog>
30000008:	eb000076 	bl	300001e8 <uart0_init>
3000000c:	e3a0006d 	mov	r0, #109	; 0x6d
30000010:	eb000014 	bl	30000068 <putc>
30000014:	eb000031 	bl	300000e0 <memsetup>
30000018:	e3a0006e 	mov	r0, #110	; 0x6e
3000001c:	eb000011 	bl	30000068 <putc>
30000020:	e3a00072 	mov	r0, #114	; 0x72
30000024:	eb00000f 	bl	30000068 <putc>
30000028:	e3a00203 	mov	r0, #805306368	; 0x30000000
3000002c:	e3a01000 	mov	r1, #0	; 0x0
30000030:	e3a02a01 	mov	r2, #4096	; 0x1000
30000034:	eb000176 	bl	30000614 <nand_read>
30000038:	e3a0006f 	mov	r0, #111	; 0x6f
3000003c:	eb000009 	bl	30000068 <putc>
30000040:	e3a0d30d 	mov	sp, #872415232	; 0x34000000
30000044:	e59fe004 	ldr	lr, [pc, #4]	; 30000050 <.text+0x50>
30000048:	e59ff004 	ldr	pc, [pc, #4]	; 30000054 <.text+0x54>

3000004c <halt_loop>:
3000004c:	eafffffe 	b	3000004c <halt_loop>
30000050:	3000004c 	andcc	r0, r0, ip, asr #32
30000054:	30000738 	andcc	r0, r0, r8, lsr r7

30000058 <disable_watch_dog>:
30000058:	e3a02000 	mov	r2, #0	; 0x0
3000005c:	e3a03453 	mov	r3, #1392508928	; 0x53000000
30000060:	e5832000 	str	r2, [r3]
30000064:	e1a0f00e 	mov	pc, lr

30000068 <putc>:
30000068:	e20000ff 	and	r0, r0, #255	; 0xff
3000006c:	e3a02205 	mov	r2, #1342177280	; 0x50000000
30000070:	e5923010 	ldr	r3, [r2, #16]
30000074:	e3130004 	tst	r3, #4	; 0x4
30000078:	0afffffc 	beq	30000070 <putc+0x8>
3000007c:	e5c20020 	strb	r0, [r2, #32]
30000080:	e1a0f00e 	mov	pc, lr

30000084 <puthex>:
30000084:	e92d4030 	stmdb	sp!, {r4, r5, lr}
30000088:	e1a05000 	mov	r5, r0
3000008c:	e3a00030 	mov	r0, #48	; 0x30
30000090:	ebfffff4 	bl	30000068 <putc>
30000094:	e3a00078 	mov	r0, #120	; 0x78
30000098:	e3a04000 	mov	r4, #0	; 0x0
3000009c:	ebfffff1 	bl	30000068 <putc>
300000a0:	e2643007 	rsb	r3, r4, #7	; 0x7
300000a4:	e1a03103 	mov	r3, r3, lsl #2
300000a8:	e1a03335 	mov	r3, r5, lsr r3
300000ac:	e203000f 	and	r0, r3, #15	; 0xf
300000b0:	e3500009 	cmp	r0, #9	; 0x9
300000b4:	e240300a 	sub	r3, r0, #10	; 0xa
300000b8:	92800030 	addls	r0, r0, #48	; 0x30
300000bc:	9a000002 	bls	300000cc <puthex+0x48>
300000c0:	e3530005 	cmp	r3, #5	; 0x5
300000c4:	e2803037 	add	r3, r0, #55	; 0x37
300000c8:	920300ff 	andls	r0, r3, #255	; 0xff
300000cc:	e2844001 	add	r4, r4, #1	; 0x1
300000d0:	ebffffe4 	bl	30000068 <putc>
300000d4:	e3540007 	cmp	r4, #7	; 0x7
300000d8:	dafffff0 	ble	300000a0 <puthex+0x1c>
300000dc:	e8bd8030 	ldmia	sp!, {r4, r5, pc}

300000e0 <memsetup>:
						// sp = 4096
						
300000e0:	e92d45f0 	stmdb	sp!, {r4, r5, r6, r7, r8, sl, lr}
									

300000e4:	e59fc0f4 	ldr	ip, [pc, #244]	; 300001e0 <.text+0x1e0>
300000e8:	e1a0e00c 	mov	lr, ip  // lr = ip = 30000774
300000ec:	e8be000f 	ldmia	lr!, {r0, r1, r2, r3}
                        // 去30000774取值，存入r0-r3,本意是把
                        // 22011110 => r0
                        // 0x00000700 => r1
                        // 0x00000700 => r2
                        // 0x00000700 => r3


300000f0:	e3a06000 	mov	r6, #0	; 0x0
300000f4:	e3a08312 	mov	r8, #1207959552	; 0x48000000  // p 
300000f8:	e3a0a203 	mov	sl, #805306368	; 0x30000000  // mem

300000fc:	e24dd034 	sub	sp, sp, #52	; 0x34
                        // sp=sp-52=4016=0xFB0

30000100:	e1a0c00d 	mov	ip, sp // ip=0xFB0
30000104:	e8ac000f 	stmia	ip!, {r0, r1, r2, r3}
						// 把r0-r4这4个值存入栈


30000108:	e8be000f 	ldmia	lr!, {r0, r1, r2, r3}
						// 再从SDRAM里取4个值放入r0-r3
						// 

3000010c:	e1a0700d 	mov	r7, sp
30000110:	e8ac000f 	stmia	ip!, {r0, r1, r2, r3}
						// 把r0-r4这4个值存入栈

30000114:	e8be000f 	ldmia	lr!, {r0, r1, r2, r3}
30000118:	e59e4000 	ldr	r4, [lr]
3000011c:	e8ac000f 	stmia	ip!, {r0, r1, r2, r3}
30000120:	e3a00073 	mov	r0, #115	; 0x73
30000124:	e58c4000 	str	r4, [ip]
30000128:	ebffffce 	bl	30000068 <putc>
3000012c:	e3a00074 	mov	r0, #116	; 0x74
30000130:	ebffffcc 	bl	30000068 <putc>
30000134:	e3a00061 	mov	r0, #97	; 0x61
30000138:	ebffffca 	bl	30000068 <putc>
3000013c:	e3a00072 	mov	r0, #114	; 0x72
30000140:	ebffffc8 	bl	30000068 <putc>
30000144:	e3a00074 	mov	r0, #116	; 0x74
30000148:	ebffffc6 	bl	30000068 <putc>
3000014c:	e59f0090 	ldr	r0, [pc, #144]	; 300001e4 <.text+0x1e4>
30000150:	ebffffcb 	bl	30000084 <puthex>
30000154:	e28d2034 	add	r2, sp, #52	; 0x34
30000158:	e1a04106 	mov	r4, r6, lsl #2
3000015c:	e0843002 	add	r3, r4, r2
30000160:	e5135034 	ldr	r5, [r3, #-52]
30000164:	e2860031 	add	r0, r6, #49	; 0x31
30000168:	e7885106 	str	r5, [r8, r6, lsl #2]
3000016c:	e20000ff 	and	r0, r0, #255	; 0xff
30000170:	ebffffbc 	bl	30000068 <putc>
30000174:	e3a0003a 	mov	r0, #58	; 0x3a
30000178:	ebffffba 	bl	30000068 <putc>
3000017c:	e0870004 	add	r0, r7, r4
30000180:	ebffffbf 	bl	30000084 <puthex>
30000184:	e3a00020 	mov	r0, #32	; 0x20
30000188:	ebffffb6 	bl	30000068 <putc>
3000018c:	e1a00005 	mov	r0, r5
30000190:	ebffffbb 	bl	30000084 <puthex>
30000194:	e3a0000a 	mov	r0, #10	; 0xa
30000198:	ebffffb2 	bl	30000068 <putc>
3000019c:	e2866001 	add	r6, r6, #1	; 0x1
300001a0:	e3a0000d 	mov	r0, #13	; 0xd
300001a4:	ebffffaf 	bl	30000068 <putc>
300001a8:	e356000c 	cmp	r6, #12	; 0xc
300001ac:	daffffe8 	ble	30000154 <memsetup+0x74>
300001b0:	e3a00065 	mov	r0, #101	; 0x65
300001b4:	ebffffab 	bl	30000068 <putc>
300001b8:	e3a0006e 	mov	r0, #110	; 0x6e
300001bc:	ebffffa9 	bl	30000068 <putc>
300001c0:	e3a00064 	mov	r0, #100	; 0x64
300001c4:	ebffffa7 	bl	30000068 <putc>
300001c8:	e3a0304b 	mov	r3, #75	; 0x4b
300001cc:	e5ca3000 	strb	r3, [sl]
300001d0:	e5da0000 	ldrb	r0, [sl]
300001d4:	ebffffa3 	bl	30000068 <putc>
300001d8:	e28dd034 	add	sp, sp, #52	; 0x34
300001dc:	e8bd85f0 	ldmia	sp!, {r4, r5, r6, r7, r8, sl, pc}
300001e0:	30000774 	andcc	r0, r0, r4, ror r7
300001e4:	1234abcd 	eornes	sl, r4, #209920	; 0x33400

300001e8 <uart0_init>:
300001e8:	e52de004 	str	lr, [sp, #-4]!
300001ec:	e3a02456 	mov	r2, #1442840576	; 0x56000000
300001f0:	e3a0e00c 	mov	lr, #12	; 0xc
300001f4:	e3a0c205 	mov	ip, #1342177280	; 0x50000000
300001f8:	e3a01005 	mov	r1, #5	; 0x5
300001fc:	e3a00000 	mov	r0, #0	; 0x0
30000200:	e5923070 	ldr	r3, [r2, #112]
30000204:	e38330a0 	orr	r3, r3, #160	; 0xa0
30000208:	e5823070 	str	r3, [r2, #112]
3000020c:	e3a03003 	mov	r3, #3	; 0x3
30000210:	e582e078 	str	lr, [r2, #120]
30000214:	e3a02285 	mov	r2, #1342177288	; 0x50000008
30000218:	e58c3000 	str	r3, [ip]
3000021c:	e2833215 	add	r3, r3, #1342177281	; 0x50000001
30000220:	e4831008 	str	r1, [r3], #8
30000224:	e5820000 	str	r0, [r2]
30000228:	e5830000 	str	r0, [r3]
3000022c:	e58ce028 	str	lr, [ip, #40]
30000230:	e49df004 	ldr	pc, [sp], #4

30000234 <puts>:
30000234:	e92d4030 	stmdb	sp!, {r4, r5, lr}
30000238:	e1a05000 	mov	r5, r0
3000023c:	e3a04000 	mov	r4, #0	; 0x0
30000240:	e5d00000 	ldrb	r0, [r0]
30000244:	e3500000 	cmp	r0, #0	; 0x0
30000248:	08bd8030 	ldmeqia	sp!, {r4, r5, pc}
3000024c:	e2844001 	add	r4, r4, #1	; 0x1
30000250:	ebffff84 	bl	30000068 <putc>
30000254:	e7d50004 	ldrb	r0, [r5, r4]
30000258:	e3500000 	cmp	r0, #0	; 0x0
3000025c:	1afffffa 	bne	3000024c <puts+0x18>
30000260:	e8bd8030 	ldmia	sp!, {r4, r5, pc}

30000264 <s3c2410_nand_select_chip>:
30000264:	e59f301c 	ldr	r3, [pc, #28]	; 30000288 <.text+0x288>
30000268:	e5931000 	ldr	r1, [r3]
3000026c:	e5912000 	ldr	r2, [r1]
30000270:	e3c22b02 	bic	r2, r2, #2048	; 0x800
30000274:	e5812000 	str	r2, [r1]
30000278:	e3a03009 	mov	r3, #9	; 0x9
3000027c:	e2533001 	subs	r3, r3, #1	; 0x1
30000280:	5afffffd 	bpl	3000027c <s3c2410_nand_select_chip+0x18>
30000284:	e1a0f00e 	mov	pc, lr
30000288:	300006d0 	ldrccd	r0, [r0], -r0

3000028c <s3c2410_write_cmd>:
3000028c:	e59f3008 	ldr	r3, [pc, #8]	; 3000029c <.text+0x29c>
30000290:	e5932000 	ldr	r2, [r3]
30000294:	e5c20004 	strb	r0, [r2, #4]
30000298:	e1a0f00e 	mov	pc, lr
3000029c:	300006d0 	ldrccd	r0, [r0], -r0

300002a0 <s3c2410_wait_idle>:
300002a0:	e59f302c 	ldr	r3, [pc, #44]	; 300002d4 <.text+0x2d4>
300002a4:	e5931000 	ldr	r1, [r3]
300002a8:	e5d12010 	ldrb	r2, [r1, #16]
300002ac:	e3120001 	tst	r2, #1	; 0x1
300002b0:	e2811010 	add	r1, r1, #16	; 0x10
300002b4:	11a0f00e 	movne	pc, lr
300002b8:	e3a03009 	mov	r3, #9	; 0x9
300002bc:	e2533001 	subs	r3, r3, #1	; 0x1
300002c0:	5afffffd 	bpl	300002bc <s3c2410_wait_idle+0x1c>
300002c4:	e5d13000 	ldrb	r3, [r1]
300002c8:	e3130001 	tst	r3, #1	; 0x1
300002cc:	0afffff9 	beq	300002b8 <s3c2410_wait_idle+0x18>
300002d0:	e1a0f00e 	mov	pc, lr
300002d4:	300006d0 	ldrccd	r0, [r0], -r0

300002d8 <s3c2410_nand_deselect_chip>:
300002d8:	e59f3010 	ldr	r3, [pc, #16]	; 300002f0 <.text+0x2f0>
300002dc:	e5931000 	ldr	r1, [r3]
300002e0:	e5912000 	ldr	r2, [r1]
300002e4:	e3822b02 	orr	r2, r2, #2048	; 0x800
300002e8:	e5812000 	str	r2, [r1]
300002ec:	e1a0f00e 	mov	pc, lr
300002f0:	300006d0 	ldrccd	r0, [r0], -r0

300002f4 <s3c2410_nand_reset>:
300002f4:	e52de004 	str	lr, [sp, #-4]!
300002f8:	ebffffd9 	bl	30000264 <s3c2410_nand_select_chip>
300002fc:	e3a000ff 	mov	r0, #255	; 0xff
30000300:	ebffffe1 	bl	3000028c <s3c2410_write_cmd>
30000304:	ebffffe5 	bl	300002a0 <s3c2410_wait_idle>
30000308:	e49de004 	ldr	lr, [sp], #4
3000030c:	eafffff1 	b	300002d8 <s3c2410_nand_deselect_chip>

30000310 <s3c2410_write_addr>:
30000310:	e59f3054 	ldr	r3, [pc, #84]	; 3000036c <.text+0x36c>
30000314:	e5932000 	ldr	r2, [r3]
30000318:	e5c20008 	strb	r0, [r2, #8]
3000031c:	e3a03009 	mov	r3, #9	; 0x9
30000320:	e2822008 	add	r2, r2, #8	; 0x8
30000324:	e2533001 	subs	r3, r3, #1	; 0x1
30000328:	5afffffd 	bpl	30000324 <s3c2410_write_addr+0x14>
3000032c:	e1a034a0 	mov	r3, r0, lsr #9
30000330:	e5c23000 	strb	r3, [r2]
30000334:	e3a03009 	mov	r3, #9	; 0x9
30000338:	e2533001 	subs	r3, r3, #1	; 0x1
3000033c:	5afffffd 	bpl	30000338 <s3c2410_write_addr+0x28>
30000340:	e1a038a0 	mov	r3, r0, lsr #17
30000344:	e5c23000 	strb	r3, [r2]
30000348:	e3a03009 	mov	r3, #9	; 0x9
3000034c:	e2533001 	subs	r3, r3, #1	; 0x1
30000350:	5afffffd 	bpl	3000034c <s3c2410_write_addr+0x3c>
30000354:	e1a03ca0 	mov	r3, r0, lsr #25
30000358:	e5c23000 	strb	r3, [r2]
3000035c:	e3a03009 	mov	r3, #9	; 0x9
30000360:	e2533001 	subs	r3, r3, #1	; 0x1
30000364:	5afffffd 	bpl	30000360 <s3c2410_write_addr+0x50>
30000368:	e1a0f00e 	mov	pc, lr
3000036c:	300006d0 	ldrccd	r0, [r0], -r0

30000370 <s3c2410_read_data>:
30000370:	e59f3008 	ldr	r3, [pc, #8]	; 30000380 <.text+0x380>
30000374:	e5932000 	ldr	r2, [r3]
30000378:	e5d2000c 	ldrb	r0, [r2, #12]
3000037c:	e1a0f00e 	mov	pc, lr
30000380:	300006d0 	ldrccd	r0, [r0], -r0

30000384 <s3c2440_nand_select_chip>:
30000384:	e59f301c 	ldr	r3, [pc, #28]	; 300003a8 <.text+0x3a8>
30000388:	e5931000 	ldr	r1, [r3]
3000038c:	e5912004 	ldr	r2, [r1, #4]
30000390:	e3c22002 	bic	r2, r2, #2	; 0x2
30000394:	e5812004 	str	r2, [r1, #4]
30000398:	e3a03009 	mov	r3, #9	; 0x9
3000039c:	e2533001 	subs	r3, r3, #1	; 0x1
300003a0:	5afffffd 	bpl	3000039c <s3c2440_nand_select_chip+0x18>
300003a4:	e1a0f00e 	mov	pc, lr
300003a8:	300006cc 	andcc	r0, r0, ip, asr #13

300003ac <s3c2440_write_cmd>:
300003ac:	e59f3008 	ldr	r3, [pc, #8]	; 300003bc <.text+0x3bc>
300003b0:	e5932000 	ldr	r2, [r3]
300003b4:	e5c20008 	strb	r0, [r2, #8]
300003b8:	e1a0f00e 	mov	pc, lr
300003bc:	300006cc 	andcc	r0, r0, ip, asr #13

300003c0 <s3c2440_wait_idle>:
300003c0:	e59f302c 	ldr	r3, [pc, #44]	; 300003f4 <.text+0x3f4>
300003c4:	e5931000 	ldr	r1, [r3]
300003c8:	e5d12020 	ldrb	r2, [r1, #32]
300003cc:	e3120001 	tst	r2, #1	; 0x1
300003d0:	e2811020 	add	r1, r1, #32	; 0x20
300003d4:	11a0f00e 	movne	pc, lr
300003d8:	e3a03009 	mov	r3, #9	; 0x9
300003dc:	e2533001 	subs	r3, r3, #1	; 0x1
300003e0:	5afffffd 	bpl	300003dc <s3c2440_wait_idle+0x1c>
300003e4:	e5d13000 	ldrb	r3, [r1]
300003e8:	e3130001 	tst	r3, #1	; 0x1
300003ec:	0afffff9 	beq	300003d8 <s3c2440_wait_idle+0x18>
300003f0:	e1a0f00e 	mov	pc, lr
300003f4:	300006cc 	andcc	r0, r0, ip, asr #13

300003f8 <s3c2440_nand_deselect_chip>:
300003f8:	e59f3010 	ldr	r3, [pc, #16]	; 30000410 <.text+0x410>
300003fc:	e5931000 	ldr	r1, [r3]
30000400:	e5912004 	ldr	r2, [r1, #4]
30000404:	e3822002 	orr	r2, r2, #2	; 0x2
30000408:	e5812004 	str	r2, [r1, #4]
3000040c:	e1a0f00e 	mov	pc, lr
30000410:	300006cc 	andcc	r0, r0, ip, asr #13

30000414 <s3c2440_nand_reset>:
30000414:	e52de004 	str	lr, [sp, #-4]!
30000418:	ebffffd9 	bl	30000384 <s3c2440_nand_select_chip>
3000041c:	e3a000ff 	mov	r0, #255	; 0xff
30000420:	ebffffe1 	bl	300003ac <s3c2440_write_cmd>
30000424:	ebffffe5 	bl	300003c0 <s3c2440_wait_idle>
30000428:	e49de004 	ldr	lr, [sp], #4
3000042c:	eafffff1 	b	300003f8 <s3c2440_nand_deselect_chip>

30000430 <s3c2440_write_addr_lp>:
30000430:	e59f3078 	ldr	r3, [pc, #120]	; 300004b0 <.text+0x4b0>
30000434:	e1a01a80 	mov	r1, r0, lsl #21
30000438:	e5932000 	ldr	r2, [r3]
3000043c:	e1a01aa1 	mov	r1, r1, lsr #21
30000440:	e3c13000 	bic	r3, r1, #0	; 0x0
30000444:	e5c2300c 	strb	r3, [r2, #12]
30000448:	e1a005a0 	mov	r0, r0, lsr #11
3000044c:	e282200c 	add	r2, r2, #12	; 0xc
30000450:	e3a03009 	mov	r3, #9	; 0x9
30000454:	e2533001 	subs	r3, r3, #1	; 0x1
30000458:	5afffffd 	bpl	30000454 <s3c2440_write_addr_lp+0x24>
3000045c:	e1a03421 	mov	r3, r1, lsr #8
30000460:	e5c23000 	strb	r3, [r2]
30000464:	e3a03009 	mov	r3, #9	; 0x9
30000468:	e2533001 	subs	r3, r3, #1	; 0x1
3000046c:	5afffffd 	bpl	30000468 <s3c2440_write_addr_lp+0x38>
30000470:	e5c20000 	strb	r0, [r2]
30000474:	e3a03009 	mov	r3, #9	; 0x9
30000478:	e2533001 	subs	r3, r3, #1	; 0x1
3000047c:	5afffffd 	bpl	30000478 <s3c2440_write_addr_lp+0x48>
30000480:	e1a03440 	mov	r3, r0, asr #8
30000484:	e5c23000 	strb	r3, [r2]
30000488:	e3a03009 	mov	r3, #9	; 0x9
3000048c:	e2533001 	subs	r3, r3, #1	; 0x1
30000490:	5afffffd 	bpl	3000048c <s3c2440_write_addr_lp+0x5c>
30000494:	e1a03840 	mov	r3, r0, asr #16
30000498:	e2033003 	and	r3, r3, #3	; 0x3
3000049c:	e5c23000 	strb	r3, [r2]
300004a0:	e3a03009 	mov	r3, #9	; 0x9
300004a4:	e2533001 	subs	r3, r3, #1	; 0x1
300004a8:	5afffffd 	bpl	300004a4 <s3c2440_write_addr_lp+0x74>
300004ac:	e1a0f00e 	mov	pc, lr
300004b0:	300006cc 	andcc	r0, r0, ip, asr #13

300004b4 <s3c2440_read_data>:
300004b4:	e59f3008 	ldr	r3, [pc, #8]	; 300004c4 <.text+0x4c4>
300004b8:	e5932000 	ldr	r2, [r3]
300004bc:	e5d20010 	ldrb	r0, [r2, #16]
300004c0:	e1a0f00e 	mov	pc, lr
300004c4:	300006cc 	andcc	r0, r0, ip, asr #13

300004c8 <write_cmd>:
300004c8:	e52de004 	str	lr, [sp, #-4]!
300004cc:	e59f3008 	ldr	r3, [pc, #8]	; 300004dc <.text+0x4dc>
300004d0:	e1a0e00f 	mov	lr, pc
300004d4:	e593f010 	ldr	pc, [r3, #16]
300004d8:	e49df004 	ldr	pc, [sp], #4
300004dc:	300006d4 	ldrccd	r0, [r0], -r4

300004e0 <nand_init>:
300004e0:	e52de004 	str	lr, [sp, #-4]!
300004e4:	e3a0e456 	mov	lr, #1442840576	; 0x56000000
300004e8:	e3a035c9 	mov	r3, #843055104	; 0x32400000
300004ec:	e3a015c9 	mov	r1, #843055104	; 0x32400000
300004f0:	e2833801 	add	r3, r3, #65536	; 0x10000
300004f4:	e2811801 	add	r1, r1, #65536	; 0x10000
300004f8:	e3a0cb26 	mov	ip, #38912	; 0x9800
300004fc:	e2811002 	add	r1, r1, #2	; 0x2
30000500:	e59f00c8 	ldr	r0, [pc, #200]	; 300005d0 <.text+0x5d0>
30000504:	e28cc030 	add	ip, ip, #48	; 0x30
30000508:	e59e20b0 	ldr	r2, [lr, #176]
3000050c:	e1520003 	cmp	r2, r3
30000510:	0a00001a 	beq	30000580 <nand_init+0xa0>
30000514:	e59e30b0 	ldr	r3, [lr, #176]
30000518:	e1530001 	cmp	r3, r1
3000051c:	0a000017 	beq	30000580 <nand_init+0xa0>
30000520:	e59f30ac 	ldr	r3, [pc, #172]	; 300005d4 <.text+0x5d4>
30000524:	e5931000 	ldr	r1, [r3]
30000528:	e59f00a0 	ldr	r0, [pc, #160]	; 300005d0 <.text+0x5d0>
3000052c:	e3a03013 	mov	r3, #19	; 0x13
30000530:	e59f20a0 	ldr	r2, [pc, #160]	; 300005d8 <.text+0x5d8>
30000534:	e5813004 	str	r3, [r1, #4]
30000538:	e59f309c 	ldr	r3, [pc, #156]	; 300005dc <.text+0x5dc>
3000053c:	e5802000 	str	r2, [r0]
30000540:	e59f2098 	ldr	r2, [pc, #152]	; 300005e0 <.text+0x5e0>
30000544:	e5803004 	str	r3, [r0, #4]
30000548:	e59f3094 	ldr	r3, [pc, #148]	; 300005e4 <.text+0x5e4>
3000054c:	e5802008 	str	r2, [r0, #8]
30000550:	e59f2090 	ldr	r2, [pc, #144]	; 300005e8 <.text+0x5e8>
30000554:	e580300c 	str	r3, [r0, #12]
30000558:	e59f308c 	ldr	r3, [pc, #140]	; 300005ec <.text+0x5ec>
3000055c:	e5802010 	str	r2, [r0, #16]
30000560:	e59f2088 	ldr	r2, [pc, #136]	; 300005f0 <.text+0x5f0>
30000564:	e5803014 	str	r3, [r0, #20]
30000568:	e3a03c03 	mov	r3, #768	; 0x300
3000056c:	e5802018 	str	r2, [r0, #24]
30000570:	e5813000 	str	r3, [r1]
30000574:	e1a0e00f 	mov	lr, pc
30000578:	e590f000 	ldr	pc, [r0]
3000057c:	e49df004 	ldr	pc, [sp], #4
30000580:	e59f306c 	ldr	r3, [pc, #108]	; 300005f4 <.text+0x5f4>
30000584:	e5932000 	ldr	r2, [r3]
30000588:	e59f3068 	ldr	r3, [pc, #104]	; 300005f8 <.text+0x5f8>
3000058c:	e582c000 	str	ip, [r2]
30000590:	e59f2064 	ldr	r2, [pc, #100]	; 300005fc <.text+0x5fc>
30000594:	e5803000 	str	r3, [r0]
30000598:	e59f3060 	ldr	r3, [pc, #96]	; 30000600 <.text+0x600>
3000059c:	e5802004 	str	r2, [r0, #4]
300005a0:	e59f205c 	ldr	r2, [pc, #92]	; 30000604 <.text+0x604>
300005a4:	e5803008 	str	r3, [r0, #8]
300005a8:	e59f3058 	ldr	r3, [pc, #88]	; 30000608 <.text+0x608>
300005ac:	e580200c 	str	r2, [r0, #12]
300005b0:	e59f2054 	ldr	r2, [pc, #84]	; 3000060c <.text+0x60c>
300005b4:	e5803010 	str	r3, [r0, #16]
300005b8:	e59f3050 	ldr	r3, [pc, #80]	; 30000610 <.text+0x610>
300005bc:	e5802014 	str	r2, [r0, #20]
300005c0:	e5803018 	str	r3, [r0, #24]
300005c4:	e1a0e00f 	mov	lr, pc
300005c8:	e590f000 	ldr	pc, [r0]
300005cc:	e49df004 	ldr	pc, [sp], #4
300005d0:	300006d4 	ldrccd	r0, [r0], -r4
300005d4:	300006cc 	andcc	r0, r0, ip, asr #13
300005d8:	30000414 	andcc	r0, r0, r4, lsl r4
300005dc:	300003c0 	andcc	r0, r0, r0, asr #7
300005e0:	30000384 	andcc	r0, r0, r4, lsl #7
300005e4:	300003f8 	strccd	r0, [r0], -r8
300005e8:	300003ac 	andcc	r0, r0, ip, lsr #7
300005ec:	30000430 	andcc	r0, r0, r0, lsr r4
300005f0:	300004b4 	strcch	r0, [r0], -r4
300005f4:	300006d0 	ldrccd	r0, [r0], -r0
300005f8:	300002f4 	strccd	r0, [r0], -r4
300005fc:	300002a0 	andcc	r0, r0, r0, lsr #5
30000600:	30000264 	andcc	r0, r0, r4, ror #4
30000604:	300002d8 	ldrccd	r0, [r0], -r8
30000608:	3000028c 	andcc	r0, r0, ip, lsl #5
3000060c:	30000310 	andcc	r0, r0, r0, lsl r3
30000610:	30000370 	andcc	r0, r0, r0, ror r3

30000614 <nand_read>:
30000614:	e1a03a81 	mov	r3, r1, lsl #21
30000618:	e1a03aa3 	mov	r3, r3, lsr #21
3000061c:	e3530000 	cmp	r3, #0	; 0x0
30000620:	e92d45f0 	stmdb	sp!, {r4, r5, r6, r7, r8, sl, lr}
30000624:	e1a05001 	mov	r5, r1
30000628:	e1a06000 	mov	r6, r0
3000062c:	e1a04002 	mov	r4, r2
30000630:	18bd85f0 	ldmneia	sp!, {r4, r5, r6, r7, r8, sl, pc}
30000634:	e1a03a82 	mov	r3, r2, lsl #21
30000638:	e1a03aa3 	mov	r3, r3, lsr #21
3000063c:	e3530000 	cmp	r3, #0	; 0x0
30000640:	18bd85f0 	ldmneia	sp!, {r4, r5, r6, r7, r8, sl, pc}
30000644:	e59f807c 	ldr	r8, [pc, #124]	; 300006c8 <.text+0x6c8>
30000648:	e1a0e00f 	mov	lr, pc
3000064c:	e598f008 	ldr	pc, [r8, #8]
30000650:	e3a03009 	mov	r3, #9	; 0x9
30000654:	e2533001 	subs	r3, r3, #1	; 0x1
30000658:	5afffffd 	bpl	30000654 <nand_read+0x40>
3000065c:	e085a004 	add	sl, r5, r4
30000660:	e155000a 	cmp	r5, sl
30000664:	2a000014 	bcs	300006bc <nand_read+0xa8>
30000668:	e3a07e7f 	mov	r7, #2032	; 0x7f0
3000066c:	e287700f 	add	r7, r7, #15	; 0xf
30000670:	e3a00000 	mov	r0, #0	; 0x0
30000674:	ebffff93 	bl	300004c8 <write_cmd>
30000678:	e1a00005 	mov	r0, r5
3000067c:	e1a0e00f 	mov	lr, pc
30000680:	e598f014 	ldr	pc, [r8, #20]
30000684:	e3a00030 	mov	r0, #48	; 0x30
30000688:	ebffff8e 	bl	300004c8 <write_cmd>
3000068c:	e1a0e00f 	mov	lr, pc
30000690:	e598f004 	ldr	pc, [r8, #4]
30000694:	e3a04000 	mov	r4, #0	; 0x0
30000698:	e1a0e00f 	mov	lr, pc
3000069c:	e598f018 	ldr	pc, [r8, #24]
300006a0:	e2844001 	add	r4, r4, #1	; 0x1
300006a4:	e1540007 	cmp	r4, r7
300006a8:	e4c60001 	strb	r0, [r6], #1
300006ac:	e2855001 	add	r5, r5, #1	; 0x1
300006b0:	dafffff8 	ble	30000698 <nand_read+0x84>
300006b4:	e155000a 	cmp	r5, sl
300006b8:	3affffec 	bcc	30000670 <nand_read+0x5c>
300006bc:	e1a0e00f 	mov	lr, pc
300006c0:	e598f00c 	ldr	pc, [r8, #12]
300006c4:	e8bd85f0 	ldmia	sp!, {r4, r5, r6, r7, r8, sl, pc}
300006c8:	300006d4 	ldrccd	r0, [r0], -r4

300006cc <s3c2440nand>:
300006cc:	4e000000 	cdpmi	0, 0, cr0, cr0, cr0, {0}

300006d0 <s3c2410nand>:
300006d0:	4e000000 	cdpmi	0, 0, cr0, cr0, cr0, {0}

300006d4 <nand_chip>:
	...
300006f0:	43434700 	cmpmi	r3, #0	; 0x0
300006f4:	4728203a 	undefined
300006f8:	2029554e 	eorcs	r5, r9, lr, asr #10
300006fc:	2e342e33 	mrccs	14, 1, r2, cr4, cr3, {1}
30000700:	00000035 	andeq	r0, r0, r5, lsr r0

30000704 <wait>:
30000704:	e24dd004 	sub	sp, sp, #4	; 0x4
30000708:	e58d0000 	str	r0, [sp]
3000070c:	e59d3000 	ldr	r3, [sp]
30000710:	e3530000 	cmp	r3, #0	; 0x0
30000714:	0a000005 	beq	30000730 <wait+0x2c>
30000718:	e59d3000 	ldr	r3, [sp]
3000071c:	e2433001 	sub	r3, r3, #1	; 0x1
30000720:	e58d3000 	str	r3, [sp]
30000724:	e59d2000 	ldr	r2, [sp]
30000728:	e3520000 	cmp	r2, #0	; 0x0
3000072c:	1afffff9 	bne	30000718 <wait+0x14>
30000730:	e28dd004 	add	sp, sp, #4	; 0x4
30000734:	e1a0f00e 	mov	pc, lr

30000738 <main>:
30000738:	e3a02456 	mov	r2, #1442840576	; 0x56000000
3000073c:	e3a03c15 	mov	r3, #5376	; 0x1500
30000740:	e92d4030 	stmdb	sp!, {r4, r5, lr}
30000744:	e1a05002 	mov	r5, r2
30000748:	e3a04000 	mov	r4, #0	; 0x0
3000074c:	e5823050 	str	r3, [r2, #80]
30000750:	e3a00c75 	mov	r0, #29952	; 0x7500
30000754:	e2800030 	add	r0, r0, #48	; 0x30
30000758:	ebffffe9 	bl	30000704 <wait>
3000075c:	e1e03204 	mvn	r3, r4, lsl #4
30000760:	e2844001 	add	r4, r4, #1	; 0x1
30000764:	e3540008 	cmp	r4, #8	; 0x8
30000768:	02444008 	subeq	r4, r4, #8	; 0x8
3000076c:	e5853054 	str	r3, [r5, #84]
30000770:	eafffff6 	b	30000750 <main+0x18>
Disassembly of section .rodata:

30000774 <.rodata>:
30000774:	22011110 	andcs	r1, r1, #4	; 0x4
30000778:	00000700 	andeq	r0, r0, r0, lsl #14
3000077c:	00000700 	andeq	r0, r0, r0, lsl #14
30000780:	00000700 	andeq	r0, r0, r0, lsl #14
30000784:	00000700 	andeq	r0, r0, r0, lsl #14
30000788:	00000700 	andeq	r0, r0, r0, lsl #14
3000078c:	00000700 	andeq	r0, r0, r0, lsl #14
30000790:	00018005 	andeq	r8, r1, r5
30000794:	00018005 	andeq	r8, r1, r5
30000798:	008c07a3 	addeq	r0, ip, r3, lsr #15
3000079c:	000000b1 	streqh	r0, [r0], -r1
300007a0:	00000030 	andeq	r0, r0, r0, lsr r0
300007a4:	00000030 	andeq	r0, r0, r0, lsr r0
Disassembly of section .comment:

00000000 <.comment>:
   0:	43434700 	cmpmi	r3, #0	; 0x0
   4:	4728203a 	undefined
   8:	2029554e 	eorcs	r5, r9, lr, asr #10
   c:	2e342e33 	mrccs	14, 1, r2, cr4, cr3, {1}
  10:	47000035 	smladxmi	r0, r5, r0, r0
  14:	203a4343 	eorcss	r4, sl, r3, asr #6
  18:	554e4728 	strplb	r4, [lr, #-1832]
  1c:	2e332029 	cdpcs	0, 3, cr2, cr3, cr9, {1}
  20:	00352e34 	eoreqs	r2, r5, r4, lsr lr