平台:jz2440
作者：庄泽彬(欢迎转载，请注明作者)
说明：韦东山二期视频学习笔记
交叉编译工具:arm-linux-gcc (GCC)4.3.2
PC环境:ubuntu18.04
一、uboot的编译和烧录
下载uboot-2012-04版本的uboot进行移植，下载链接:ftp://ftp.denx.de/pub/u-boot/
编译:
1 make smdk2410_config
2 make -j4
使用oflash进行烧录,注意要烧录到norflash进行启动，不能烧录到nandflash启动:
1 sudo oflash u-boot.bin
使用没有修改的uboo2012-04版本烧录启动肯定不能启动，要进行修改，支持jz2440
二、uboot的启动流程
在进行移植之前，我们要先了解uboot的启动流程，才能快速的移植。根据编译过程，看看是那些文件先编译，在uboot启动阶段最先执行.
根据下图编译的log，和链接器脚本可知，arch/arm/cpu/arm920t/start.c 是最先执行的，并且链接地址为0。
根据start.c分析uboot主要内容如下:
2.1 set the cpu to SVC32 mode 设置为管理模式
2.2 turn off the watchdog 关闭看门狗
2.3 mask all IRQs by setting all bits in the INTMR
2.4 设置时钟比例: FCLK:HCLK:PCLK = 1:2:4
2.5 设置内存控制器
2.6 设置栈，调用board_init_f进行初始化
2.6.1 设置栈指针地址sp = 0x30000f80
2.6.2 设置gd变量
DECLARE_GLOBAL_DATA_PTR
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r8")
ffixed-r8
指定r8寄存器来存放gd变量的地址
2.7 重定位代码:
为什么要重定位代码呢？norflash的全局变量能像内存一样读，但是不能像内存一样写，从这一点出发也需要把代码进行重定位，重定位之后，还要修改代码，修改里面的变量，函数使用新的地址.
在链接的时候添加pie选项，会把地址信息存放在.rel和dynsym段中。arm-linux-ld -pie
查看链接脚本中也有这两个段:
最终的sdram内存分布如下图:
三、uboot重定位分析
3.1 从NOR Flash 把代码复制到sdram(源码:u-boot-2012.04.01\arch\arm\cpu\arm920t\start.S)
1 /* Set up the stack */
2 stack_setup:
3 mov sp, r4
4
5 adr r0, _start
6 cmp r0, r6
7 beq clear_bss /* skip relocation */
8 mov r1, r6 /* r1 <- scratch for copy_loop */
9 ldr r3, _bss_start_ofs
10 add r2, r0, r3 /* r2 <- source end address */
11
12 copy_loop:
13 ldmia r0!, {r9-r10} /* copy from source address [r0] */
14 stmia r1!, {r9-r10} /* copy to target address [r1] */
15 cmp r0, r2 /* until source end address [r2] */
16 blo copy_loop
3.2 程序的链接地址是0，访问全局变量、静态变量、调用函数时是基于0地址编译得到的地址,现在把程序复制到了sdram，需要修改代码，把基于0地址编译得到的地址改为新地址
1 分析"重定位之修改代码为新地址":
2 #ifndef CONFIG_SPL_BUILD
3 /*
4 * fix .rel.dyn relocations
5 */
6 ldr r0, _TEXT_BASE /* r0 <- Text base */
7 // r0=0, 代码基地址
8
9 sub r9, r6, r0 /* r9 <- relocation offset */
10 // r9 = r6-r0 = 0x33f41000 - 0 = 0x33f41000
11
12 ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */
13 // r10 = 00073608
14
15 add r10, r10, r0 /* r10 <- sym table in FLASH */
16 // r10 = 00073608 + 0 = 00073608
17
18 ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */
19 // r2=0006b568
20
21 add r2, r2, r0 /* r2 <- rel dyn start in FLASH */
22 // r2=r2+r0=0006b568
23
24 ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */
25 // r3=00073608
26
27 add r3, r3, r0 /* r3 <- rel dyn end in FLASH */
28 // r3=r3+r0=00073608
29
30 fixloop:
31 ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */
32 1. r0=[0006b568]=00000020
33
34 add r0, r0, r9 /* r0 <- location to fix up in RAM */
35 1. r0=r0+r9=00000020 + 0x33f41000 = 0x33f41020
36
37 ldr r1, [r2, #4]
38 1. r1=[0006b568+4]=00000017
39
40 and r7, r1, #0xff
41 1. r7=r1&0xff=00000017
42
43 cmp r7, #23 /* relative fixup? */
44 1. r7 == 23(0x17)
45
46 beq fixrel
47 cmp r7, #2 /* absolute fixup? */
48
49 beq fixabs
50 /* ignore unknown type of fixup */
51 b fixnext
52 fixabs:
53 /* absolute fix: set location to (offset) symbol value */
54 mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */
55
56 add r1, r10, r1 /* r1 <- address of symbol in table */
57
58 ldr r1, [r1, #4] /* r1 <- symbol value */
59
60 add r1, r1, r9 /* r1 <- relocated sym addr */
61
62 b fixnext
63 fixrel:
64 /* relative fix: increase location by offset */
65 ldr r1, [r0]
66 1. r1=[00000020]=000001e0
67
68 add r1, r1, r9
69 1. r1=r1+r9=000001e0 + 0x33f41000 = 33F411E0
70
71 fixnext:
72 str r1, [r0]
73 1. [0x33f41020] = 33F411E0
74
75 add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
76 1. r2=r2+8=0006b568+8=6B570
77
78 cmp r2, r3
79 1.
80
81 blo fixloop
82 #endif
3.3 调用clear_bss
3.4 调用C函数board_init_r：第2阶段的代码
四、修改uboot代码--新建单板、修改系统时钟、串口
4.1 新建新的单板
4.2修改系统时钟、支持串口显示:
uboot代码里先以60Mhz时钟计算参数来设置内存控制器，但是还没有设置MPLL
cpu_init_crit
| |
| lowlevel_init 对内存的初始化，要求HCLK=60Mhz,但是时钟的设置在初始化内存之后，这部分代码有问题需要调整
|
board_init_f
|
init_sequence
|
board_early_init_f
/* to reduce PLL lock time, adjust the LOCKTIME register */
writel(0xFFFFFF, &clk_power->locktime);
/* configure MPLL */
writel((M_MDIV << 12) + (M_PDIV << 4) + M_SDIV,&clk_power->mpllcon);
使用openjtag调试，根据下面调试的内容可知，无法往sdram写入数据，这部分的初始化需要调整
代码修改如下:
1 zhuang@zhuang:~/project/3-jz2440/systems/u-boot-2012.04.01$ git diff .
2 diff --git a/arch/arm/cpu/arm920t/start.S b/arch/arm/cpu/arm920t/start.S
3 index 8c5612c..8655eca 100644
4 --- a/arch/arm/cpu/arm920t/start.S
5 +++ b/arch/arm/cpu/arm920t/start.S
6 @@ -169,9 +169,30 @@ copyex:
7
8 /* FCLK:HCLK:PCLK = 1:2:4 */
9 /* default FCLK is 120 MHz ! */
10 - ldr r0, =CLKDIVN
11 - mov r1, #3
12 - str r1, [r0]
13 + /* 2. 设置时钟 */
14 + ldr r0, =0x4c000014
15 + // mov r1, #0x03; // FCLK:HCLK:PCLK=1:2:4, HDIVN=1,PDIVN=1
16 + mov r1, #0x05; // FCLK:HCLK:PCLK=1:4:8
17 + str r1, [r0]
18 +
19 + /* 如果HDIVN非0，CPU的总线模式应该从“fast bus mode”变为“asynchronous bus mode” */
20 + mrc p15, 0, r1, c1, c0, 0 /* 读出控制寄存器 */
21 + orr r1, r1, #0xc0000000 /* 设置为“asynchronous bus mode” */
22 + mcr p15, 0, r1, c1, c0, 0 /* 写入控制寄存器 */
23 +
24 + #define S3C2440_MPLL_400MHZ ((0x5c<<12)|(0x01<<4)|(0x01))
25 +
26 + /* MPLLCON = S3C2440_MPLL_200MHZ */
27 + ldr r0, =0x4c000004
28 + ldr r1, =S3C2440_MPLL_400MHZ
29 + str r1, [r0]
30 +
31 + /* 启动ICACHE */
32 + mrc p15, 0, r0, c1, c0, 0 @ read control reg
33 + orr r0, r0, #(1<<12)
34 + mcr p15, 0, r0, c1, c0, 0 @ write it back
35 +
36 +
37 #endif /* CONFIG_S3C24X0 */
38
39 /*
40 diff --git a/board/samsung/smdk2440/lowlevel_init.S b/board/samsung/smdk2440/lowlevel_init.S
41 index a2bf570..c14cab3 100644
42 --- a/board/samsung/smdk2440/lowlevel_init.S
43 +++ b/board/samsung/smdk2440/lowlevel_init.S
44 @@ -152,16 +152,16 @@ lowlevel_init:
45 /* the literal pools origin */
46
47 SMRDATA:
48 - .word (0+(B1_BWSCON<<4)+(B2_BWSCON<<8)+(B3_BWSCON<<12)+(B4_BWSCON<<16)+(B5_BWSCON<<20)+(B6_BWSCON<<24)+(B7_BWSCON<<28))
49 - .word ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC))
50 - .word ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC))
51 - .word ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC))
52 - .word ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC))
53 - .word ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC))
54 - .word ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC))
55 - .word ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN))
56 - .word ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN))
57 - .word ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT)
58 - .word 0x32
59 - .word 0x30
60 - .word 0x30
61 +.long 0x22011110 //BWSCON
62 +.long 0x00000700 //BANKCON0
63 +.long 0x00000700 //BANKCON1
64 +.long 0x00000700 //BANKCON2
65 +.long 0x00000700 //BANKCON3
66 +.long 0x00000700 //BANKCON4
67 +.long 0x00000700 //BANKCON5
68 +.long 0x00018005 //BANKCON6
69 +.long 0x00018005 //BANKCON7
70 +.long 0x008C04F4 // REFRESH
71 +.long 0x000000B1 //BANKSIZE
72 +.long 0x00000030 //MRSRB6
73 +.long 0x00000030 //MRSRB7
74 diff --git a/board/samsung/smdk2440/smdk2410.c b/board/samsung/smdk2440/smdk2410.c
75 index e9ba922..44f38d1 100644
76 --- a/board/samsung/smdk2440/smdk2410.c
77 +++ b/board/samsung/smdk2440/smdk2410.c
78 @@ -74,11 +74,11 @@ int board_early_init_f(void)
79 struct s3c24x0_gpio * const gpio = s3c24x0_get_base_gpio();
80
81 /* to reduce PLL lock time, adjust the LOCKTIME register */
82 - writel(0xFFFFFF, &clk_power->locktime);
83 + //writel(0xFFFFFF, &clk_power->locktime);
84
85 /* configure MPLL */
86 - writel((M_MDIV << 12) + (M_PDIV << 4) + M_SDIV,
87 - &clk_power->mpllcon);
88 + //writel((M_MDIV << 12) + (M_PDIV << 4) + M_SDIV,
89 + // &clk_power->mpllcon);
90
91 /* some delay between MPLL and UPLL */
92 pll_delay(4000);
93 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
94 index 7d16320..71336c7 100644
95 --- a/include/configs/smdk2440.h
96 +++ b/include/configs/smdk2440.h
97 @@ -35,7 +35,8 @@
98 */
99 #define CONFIG_ARM920T /* This is an ARM920T Core */
100 #define CONFIG_S3C24X0 /* in a SAMSUNG S3C24x0-type SoC */
101 -#define CONFIG_S3C2410 /* specifically a SAMSUNG S3C2410 SoC */
102 +//#define CONFIG_S3C2410 /* specifically a SAMSUNG S3C2410 SoC */
103 +#define CONFIG_S3C2440 /* specifically a SAMSUNG S3C2410 SoC */
104 #define CONFIG_SMDK2410 /* on a SAMSUNG SMDK2410 Board */
105
106 #define CONFIG_SYS_TEXT_BASE 0x0
107 @@ -98,7 +99,7 @@
108 #define CONFIG_CMD_DATE
109 #define CONFIG_CMD_DHCP
110 #define CONFIG_CMD_ELF
111 -#define CONFIG_CMD_NAND
112 +//#define CONFIG_CMD_NAND
113 #define CONFIG_CMD_PING
114 #define CONFIG_CMD_REGINFO
115 #define CONFIG_CMD_USB
116 @@ -223,7 +224,7 @@
117 #define CONFIG_CMD_MTDPARTS
118 #define CONFIG_MTD_DEVICE
119 #define CONFIG_MTD_PARTITIONS
120 -#define CONFIG_YAFFS2
121 +//#define CONFIG_YAFFS2
122 #define CONFIG_RBTREE
123
124 /* additions for new relocation code, must be added to all boards */
编译和烧录查看现在结果，现在串口起码可以输出了啊：
五、支持nandflash启动
原来的代码在链接时加了“-pie选项”，使得u-boot.bin里多了rel、dynsym段，这两个段主要是重定位之后修改成新的地址使用的，使用这种方式代码相对会比较大。
5.1 去掉-pie选项，修改如下:
代码修改支持nandflash主要如下:
1 zhuang@zhuang:~/project/3-jz2440/systems/u-boot-2012.04.01$ git diff .
2 diff --git a/arch/arm/config.mk b/arch/arm/config.mk
3 index 3c5f987..cca02b3 100644
4 --- a/arch/arm/config.mk
5 +++ b/arch/arm/config.mk
6 @@ -72,5 +72,5 @@ endif
7
8 # needed for relocation
9 ifndef CONFIG_NAND_SPL
10 -LDFLAGS_u-boot += -pie
11 +#LDFLAGS_u-boot += -pie
12 endif
13 diff --git a/arch/arm/cpu/arm920t/start.S b/arch/arm/cpu/arm920t/start.S
14 index 8655eca..34f7da8 100644
15 --- a/arch/arm/cpu/arm920t/start.S
16 +++ b/arch/arm/cpu/arm920t/start.S
17 @@ -203,103 +203,30 @@ copyex:
18 bl cpu_init_crit
19 #endif
20
21 -/* Set stackpointer in internal RAM to call board_init_f */
22 -call_board_init_f:
23 ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
24 bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
25 +
26 + bl nand_init_ll
27 + mov r0,#0
28 + ldr r1,_TEXT_BASE
29 +
30 + ldr r2,_bss_start_ofs
31 +
32 + bl copy_code_to_sdram
33 + bl clear_bss
34 +
35 + ldr pc,=call_board_init_f
36 +
37 +/* Set stackpointer in internal RAM to call board_init_f */
38 +call_board_init_f:
39 +
40 ldr r0,=0x00000000
41 bl board_init_f
42
43 -/*------------------------------------------------------------------------------*/
44 -
45 -/*
46 - * void relocate_code (addr_sp, gd, addr_moni)
47 - *
48 - * This "function" does not return, instead it continues in RAM
49 - * after relocating the monitor code.
50 - *
51 - */
52 - .globl relocate_code
53 -relocate_code:
54 - mov r4, r0 /* save addr_sp */
55 - mov r5, r1 /* save addr of gd */
56 - mov r6, r2 /* save addr of destination */
57 -
58 - /* Set up the stack */
59 -stack_setup:
60 - mov sp, r4
61 -
62 - adr r0, _start
63 - cmp r0, r6
64 - beq clear_bss /* skip relocation */
65 - mov r1, r6 /* r1 <- scratch for copy_loop */
66 - ldr r3, _bss_start_ofs
67 - add r2, r0, r3 /* r2 <- source end address */
68 -
69 -copy_loop:
70 - ldmia r0!, {r9-r10} /* copy from source address [r0] */
71 - stmia r1!, {r9-r10} /* copy to target address [r1] */
72 - cmp r0, r2 /* until source end address [r2] */
73 - blo copy_loop
74 -
75 -#ifndef CONFIG_SPL_BUILD
76 - /*
77 - * fix .rel.dyn relocations
78 - */
79 - ldr r0, _TEXT_BASE /* r0 <- Text base */
80 - sub r9, r6, r0 /* r9 <- relocation offset */
81 - ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */
82 - add r10, r10, r0 /* r10 <- sym table in FLASH */
83 - ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */
84 - add r2, r2, r0 /* r2 <- rel dyn start in FLASH */
85 - ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */
86 - add r3, r3, r0 /* r3 <- rel dyn end in FLASH */
87 -fixloop:
88 - ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */
89 - add r0, r0, r9 /* r0 <- location to fix up in RAM */
90 - ldr r1, [r2, #4]
91 - and r7, r1, #0xff
92 - cmp r7, #23 /* relative fixup? */
93 - beq fixrel
94 - cmp r7, #2 /* absolute fixup? */
95 - beq fixabs
96 - /* ignore unknown type of fixup */
97 - b fixnext
98 -fixabs:
99 - /* absolute fix: set location to (offset) symbol value */
100 - mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */
101 - add r1, r10, r1 /* r1 <- address of symbol in table */
102 - ldr r1, [r1, #4] /* r1 <- symbol value */
103 - add r1, r1, r9 /* r1 <- relocated sym addr */
104 - b fixnext
105 -fixrel:
106 - /* relative fix: increase location by offset */
107 - ldr r1, [r0]
108 - add r1, r1, r9
109 -fixnext:
110 - str r1, [r0]
111 - add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
112 - cmp r2, r3
113 - blo fixloop
114 -#endif
115 + ldr r1,_TEXT_BASE
116
117 -clear_bss:
118 -#ifndef CONFIG_SPL_BUILD
119 - ldr r0, _bss_start_ofs
120 - ldr r1, _bss_end_ofs
121 - mov r4, r6 /* reloc addr */
122 - add r0, r0, r4
123 - add r1, r1, r4
124 - mov r2, #0x00000000 /* clear */
125 -
126 -clbss_l:str r2, [r0] /* clear loop... */
127 - add r0, r0, #4
128 - cmp r0, r1
129 - bne clbss_l
130 -
131 - bl coloured_LED_init
132 - bl red_led_on
133 -#endif
134 + //second action
135 + bl board_init_r
136
137 /*
138 * We are done. Do not return, instead branch to second part of board
139 diff --git a/arch/arm/cpu/u-boot.lds b/arch/arm/cpu/u-boot.lds
140 index e49ca0c..ba20982 100644
141 --- a/arch/arm/cpu/u-boot.lds
142 +++ b/arch/arm/cpu/u-boot.lds
143 @@ -35,6 +35,7 @@ SECTIONS
144 {
145 __image_copy_start = .;
146 CPUDIR/start.o (.text)
147 + board/samsung/smdk2440/libsmdk2440.o (.text)
148 *(.text)
149 }
150
151 diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
152 index 5270c11..afafe7b 100644
153 --- a/arch/arm/lib/board.c
154 +++ b/arch/arm/lib/board.c
155 @@ -256,7 +256,7 @@ init_fnc_t *init_sequence[] = {
156 NULL,
157 };
158
159 -void board_init_f(ulong bootflag)
160 +unsigned int board_init_f(ulong bootflag)
161 {
162 bd_t *bd;
163 init_fnc_t **init_fnc_ptr;
164 @@ -369,8 +369,9 @@ void board_init_f(ulong bootflag)
165 * reserve memory for U-Boot code, data & bss
166 * round down to next 4 kB limit
167 */
168 - addr -= gd->mon_len;
169 - addr &= ~(4096 - 1);
170 + //addr -= gd->mon_len;
171 + //addr &= ~(4096 - 1);
172 + addr = CONFIG_SYS_TEXT_BASE;
173
174 debug("Reserving %ldk for U-Boot at: %08lx\n", gd->mon_len >> 10, addr);
175
176 @@ -435,8 +436,10 @@ void board_init_f(ulong bootflag)
177 debug("relocation Offset is: %08lx\n", gd->reloc_off);
178 memcpy(id, (void *)gd, sizeof(gd_t));
179
180 - relocate_code(addr_sp, id, addr);
181 + //relocate_code(addr_sp, id, addr);
182
183 + return (unsigned int )id;
184 +
185 /* NOTREACHED - relocate_code() does not return */
186 }
187
188 diff --git a/board/samsung/smdk2440/Makefile b/board/samsung/smdk2440/Makefile
189 index b8657b4..04d36b3 100644
190 --- a/board/samsung/smdk2440/Makefile
191 +++ b/board/samsung/smdk2440/Makefile
192 @@ -25,7 +25,7 @@ include $(TOPDIR)/config.mk
193
194 LIB = $(obj)lib$(BOARD).o
195
196 -COBJS := smdk2410.o
197 +COBJS := smdk2410.o init.o
198 SOBJS := lowlevel_init.o
199
200 SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
201 diff --git a/include/common.h b/include/common.h
202 index 4b5841e..390ab72 100644
203 --- a/include/common.h
204 +++ b/include/common.h
205 @@ -273,7 +273,7 @@ int abortboot(int bootdelay);
206 extern char console_buffer[];
207
208 /* arch/$(ARCH)/lib/board.c */
209 -void board_init_f (ulong) __attribute__ ((noreturn));
210 +unsigned int board_init_f(ulong) ;
211 void board_init_r (gd_t *, ulong) __attribute__ ((noreturn));
212 int checkboard (void);
213 int checkflash (void);
214 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
215 index 71336c7..b638eb4 100644
216 --- a/include/configs/smdk2440.h
217 +++ b/include/configs/smdk2440.h
218 @@ -39,7 +39,7 @@
219 #define CONFIG_S3C2440 /* specifically a SAMSUNG S3C2410 SoC */
220 #define CONFIG_SMDK2410 /* on a SAMSUNG SMDK2410 Board */
221
222 -#define CONFIG_SYS_TEXT_BASE 0x0
223 +#define CONFIG_SYS_TEXT_BASE 0x33f00000
224
225 #define CONFIG_SYS_ARM_CACHE_WRITETHROUGH
226
227 zhuang@zhuang:~/project/3-jz2440/systems/u-boot-2012.04.01$
添加了一个文件：board/samsung/smdk2440/init.c这里封装了nandflash初始化等操作，nand_init_ll、copy_code_to_sdram，由于我们在start.S文件中重定位了代码，因此不需要在arch/arm/lib/board.c中要去掉重定位的操作relocate_code。
这个值CONFIG_SYS_TEXT_BASE为什么要设置为0x33f00000,这个值是程序链接的大小,bin文件的大小只有300多k,但是没有包含bss等段，
反汇编查看文件的大小：0x00094b40的十进制是600多k,因此设置的CONFIG_SYS_TEXT_BASE我们设置为1M(设置大一点比较安全),我们的sdram的末端地址为0x34000000,0x3400000-0x33f00000=1M
1 arm-linux-objdump -D u-boot > u-boot.dis
编译烧录，开发板设置为nandflash启动，根据下图nandflash启动还是可以输出之前的log，设置成nandflash启动的代码修改暂时没有问题，其余的bug后续修复.
六、支持norflash：
首先我们来看看代码为什么会打印 Flash:*** failed ***，norflash会调用这个进行初始化flash_init，如果初始化失败，则会卡在hang中无法执行,我们打开了调试信息之后，其实是识别出来norflash的，但是为什么会初始化失败是由于jedec_table这个数组没有添加我们norflash的型号导致的。
Board.c (arch\arm\lib)
flash_init
flash_detect_legacy
jedec_flash_match
jedec_table //根据这个数组匹配有没有相应的norflash型号
|
|success
|------
|
|failed
|-----puts(failed);
|
|-----hang();norflash初始化失败则会卡在这里
代码修改如下:
1 zhuang@zhuang:~/project/3-jz2440/systems/u-boot-2012.04.01$ git diff .
2 diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
3 index afafe7b..b8c17ae 100644
4 --- a/arch/arm/lib/board.c
5 +++ b/arch/arm/lib/board.c
6 @@ -527,8 +527,9 @@ void board_init_r(gd_t *id, ulong dest_addr)
7 print_size(flash_size, "\n");
8 # endif /* CONFIG_SYS_FLASH_CHECKSUM */
9 } else {
10 - puts(failed);
11 - hang();
12 + puts("0 KB\r\n");
13 + //puts(failed);
14 + //hang();
15 }
16 #endif
17
18 diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
19 index 35294bc..295003e 100644
20 --- a/drivers/mtd/cfi_flash.c
21 +++ b/drivers/mtd/cfi_flash.c
22 @@ -42,6 +42,9 @@
23 #include
24 #include
25
26 +//#define DEBUG 1
27 +//#define _DEBUG 1
28 +
29 /*
30 * This file implements a Common Flash Interface (CFI) driver for
31 * U-Boot.
32 diff --git a/drivers/mtd/jedec_flash.c b/drivers/mtd/jedec_flash.c
33 index 2350f36..4037ec2 100644
34 --- a/drivers/mtd/jedec_flash.c
35 +++ b/drivers/mtd/jedec_flash.c
36 @@ -367,6 +367,24 @@ static const struct amd_flash_info jedec_table[] = {
37 }
38 },
39 #endif
40 + {
41 + .mfr_id = (u16)MX_MANUFACT,
42 + .dev_id = 0x2249,
43 + .name = "MXIC MT29LV160DB",
44 + .uaddr = {
45 + [1] = MTD_UADDR_0x0555_0x02AA /* x16 */
46 + },
47 + .DevSize = SIZE_2MiB,
48 + .CmdSet = P_ID_AMD_STD,
49 + .NumEraseRegions= 4,
50 + .regions = {
51 + ERASEINFO(16*1024, 1),
52 + ERASEINFO(8*1024, 2),
53 + ERASEINFO(32*1024, 1),
54 + ERASEINFO(16*1024, 31),
55 + }
56 + },
57 +
58 };
59
60 static inline void fill_info(flash_info_t *info, const struct amd_flash_info *jedec_entry, ulong base)
61 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
62 index b638eb4..9342042 100644
63 --- a/include/configs/smdk2440.h
64 +++ b/include/configs/smdk2440.h
65 @@ -187,7 +187,7 @@
66
67 #define CONFIG_SYS_MAX_FLASH_BANKS 1
68 #define CONFIG_SYS_FLASH_BANKS_LIST { CONFIG_SYS_FLASH_BASE }
69 -#define CONFIG_SYS_MAX_FLASH_SECT (19)
70 +#define CONFIG_SYS_MAX_FLASH_SECT (128)
71
72 #define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + 0x070000)
73 #define CONFIG_ENV_IS_IN_FLASH
74 zhuang@zhuang:~/project/3-jz2440/systems/u-boot-2012.04.01$
按照上述方式进行修改,编译烧录现象如下,起码norflash初始化不会报错:
在uboot中进行norflash的读写实验，从下图可以看出norflash进行读写的实验基本没有问题，但是在0x3000000会有点问题：
由于之前在第一阶段的时候讲sp设置到了0x30000000,因此在调用函数的时候30000000的数据会变化，我们在第一阶段的时候sp已经重新定义了位置，在第二阶段的时候没有修改sp的指向，因此这里需要重新设置sp的地址：
修改代码如下:
1 diff --git a/arch/arm/cpu/arm920t/start.S b/arch/arm/cpu/arm920t/start.S
2 index 34f7da8..a1876a5 100644
3 --- a/arch/arm/cpu/arm920t/start.S
4 +++ b/arch/arm/cpu/arm920t/start.S
5 @@ -110,6 +110,11 @@ FIQ_STACK_START:
6 IRQ_STACK_START_IN:
7 .word 0x0badc0de
8
9 +.globl base_sp
10 +base_sp:
11 + .long 0
12 +
13 +
14 /*
15 * the actual start code
16 */
17 @@ -224,7 +229,9 @@ call_board_init_f:
18 bl board_init_f
19
20 ldr r1,_TEXT_BASE
21 -
22 +
23 + ldr sp,=base_sp
24 +
25 //second action
26 bl board_init_r
27
28 diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
29 index afafe7b..6cd7352 100644
30 --- a/arch/arm/lib/board.c
31 +++ b/arch/arm/lib/board.c
32 @@ -262,6 +262,7 @@ unsigned int board_init_f(ulong bootflag)
33 init_fnc_t **init_fnc_ptr;
34 gd_t *id;
35 ulong addr, addr_sp;
36 + extern ulong base_sp;
37 #ifdef CONFIG_PRAM
38 ulong reg;
39 #endif
40 @@ -436,6 +437,8 @@ unsigned int board_init_f(ulong bootflag)
41 debug("relocation Offset is: %08lx\n", gd->reloc_off);
42 memcpy(id, (void *)gd, sizeof(gd_t));
43
44 + base_sp = addr_sp;
45 +
46 //relocate_code(addr_sp, id, addr);
47
重新进行norflash的读写实验，在0x3000000读写没有问题.
七、支持nandflash操作：
修改代码如下：
1 diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
2 index 1d1b628..1554712 100644
3 --- a/drivers/mtd/nand/Makefile
4 +++ b/drivers/mtd/nand/Makefile
5 @@ -59,6 +59,7 @@ COBJS-$(CONFIG_NAND_MXS) += mxs_nand.o
6 COBJS-$(CONFIG_NAND_NDFC) += ndfc.o
7 COBJS-$(CONFIG_NAND_NOMADIK) += nomadik.o
8 COBJS-$(CONFIG_NAND_S3C2410) += s3c2410_nand.o
9 +COBJS-$(CONFIG_NAND_S3C2440) += s3c2440_nand.o
10 COBJS-$(CONFIG_NAND_S3C64XX) += s3c64xx.o
11 COBJS-$(CONFIG_NAND_SPEAR) += spr_nand.o
12 COBJS-$(CONFIG_NAND_OMAP_GPMC) += omap_gpmc.o
13 diff --git a/drivers/mtd/nand/s3c2440_nand.c b/drivers/mtd/nand/s3c2440_nand.c
14 index e1a459b..a0c8876 100644
15 --- a/drivers/mtd/nand/s3c2440_nand.c
16 +++ b/drivers/mtd/nand/s3c2440_nand.c
17 @@ -51,46 +51,47 @@ static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
18 }
19 #endif
20
21 -static void s3c2410_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
22 +static void s3c2440_hwcontrol(struct mtd_info *mtd, int dat, unsigned int ctrl)
23 {
24 struct nand_chip *chip = mtd->priv;
25 - struct s3c2410_nand *nand = s3c2410_get_base_nand();
26 -
27 - debug("hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl);
28 -
29 - if (ctrl & NAND_CTRL_CHANGE) {
30 - ulong IO_ADDR_W = (ulong)nand;
31 -
32 - if (!(ctrl & NAND_CLE))
33 - IO_ADDR_W |= S3C2410_ADDR_NCLE;
34 - if (!(ctrl & NAND_ALE))
35 - IO_ADDR_W |= S3C2410_ADDR_NALE;
36 + struct s3c2440_nand *nand = s3c2440_get_base_nand();
37
38 - chip->IO_ADDR_W = (void *)IO_ADDR_W;
39 -
40 - if (ctrl & NAND_NCE)
41 - writel(readl(&nand->nfconf) & ~S3C2410_NFCONF_nFCE,
42 - &nand->nfconf);
43 - else
44 - writel(readl(&nand->nfconf) | S3C2410_NFCONF_nFCE,
45 - &nand->nfconf);
46 + if (ctrl &NAND_CLE){
47 + writeb(dat,&nand->nfcmd);
48 + }else if (ctrl &NAND_ALE){
49 + writeb(dat,&nand->nfaddr);
50 }
51 -
52 - if (cmd != NAND_CMD_NONE)
53 - writeb(cmd, chip->IO_ADDR_W);
54 }
55
56 -static int s3c2410_dev_ready(struct mtd_info *mtd)
57 +static int s3c2440_dev_ready(struct mtd_info *mtd)
58 {
59 - struct s3c2410_nand *nand = s3c2410_get_base_nand();
60 + struct s3c2440_nand *nand = s3c2440_get_base_nand();
61 debug("dev_ready\n");
62 return readl(&nand->nfstat) & 0x01;
63 }
64
65 +static void s3c2440_nand_select(struct mtd_info *mtd, int chipnr)
66 +{
67 + struct s3c2440_nand *nand = s3c2440_get_base_nand();
68 +
69 + switch (chipnr) {
70 + case -1:
71 + nand->nfcont |= (1<<1);
72 + break;
73 + case 0:
74 + nand->nfcont &= ~(1<<1);
75 + break;
76 +
77 + default:
78 + BUG();
79 + }
80 +}
81 +
82 +
83 #ifdef CONFIG_S3C2410_NAND_HWECC
84 void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode)
85 {
86 - struct s3c2410_nand *nand = s3c2410_get_base_nand();
87 + struct s3c2440_nand *nand = s3c2440_get_base_nand();
88 debug("s3c2410_nand_enable_hwecc(%p, %d)\n", mtd, mode);
89 writel(readl(&nand->nfconf) | S3C2410_NFCONF_INITECC, &nand->nfconf);
90 }
91 @@ -126,7 +127,7 @@ int board_nand_init(struct nand_chip *nand)
92 u_int32_t cfg;
93 u_int8_t tacls, twrph0, twrph1;
94 struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();
95 - struct s3c2410_nand *nand_reg = s3c2410_get_base_nand();
96 + struct s3c2440_nand *nand_reg = s3c2440_get_base_nand();
97
98 debug("board_nand_init()\n");
99
100 @@ -143,17 +144,20 @@ int board_nand_init(struct nand_chip *nand)
101 twrph1 = 8;
102 #endif
103
104 - cfg = S3C2410_NFCONF_EN;
105 - cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
106 - cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
107 - cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
108 + //cfg = S3C2410_NFCONF_EN;
109 + //cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
110 + //cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
111 + //cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
112 + cfg = ((tacls-1)<<12)|((twrph0-1)<<8)|((twrph1-1)<<4);
113 writel(cfg, &nand_reg->nfconf);
114
115 + writel((1<<4)|(1<<1)|(1<<0), &nand_reg->nfcont);
116 +
117 /* initialize nand_chip data structure */
118 nand->IO_ADDR_R = (void *)&nand_reg->nfdata;
119 nand->IO_ADDR_W = (void *)&nand_reg->nfdata;
120
121 - nand->select_chip = NULL;
122 + nand->select_chip = s3c2440_nand_select;
123
124 /* read_buf and write_buf are default */
125 /* read_byte and write_byte are default */
126 @@ -162,9 +166,9 @@ int board_nand_init(struct nand_chip *nand)
127 #endif
128
129 /* hwcontrol always must be implemented */
130 - nand->cmd_ctrl = s3c2410_hwcontrol;
131 + nand->cmd_ctrl = s3c2440_hwcontrol;
132
133 - nand->dev_ready = s3c2410_dev_ready;
134 + nand->dev_ready = s3c2440_dev_ready;
135
136 #ifdef CONFIG_S3C2410_NAND_HWECC
137 nand->ecc.hwctl = s3c2410_nand_enable_hwecc;
138 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
139 index 9342042..6f5710d 100644
140 --- a/include/configs/smdk2440.h
141 +++ b/include/configs/smdk2440.h
142 @@ -99,7 +99,7 @@
143 #define CONFIG_CMD_DATE
144 #define CONFIG_CMD_DHCP
145 #define CONFIG_CMD_ELF
146 -//#define CONFIG_CMD_NAND
147 +#define CONFIG_CMD_NAND
148 #define CONFIG_CMD_PING
149 #define CONFIG_CMD_REGINFO
150 #define CONFIG_CMD_USB
151 @@ -208,8 +208,14 @@
152 * NAND configuration
153 */
154 #ifdef CONFIG_CMD_NAND
155 +
156 +#ifdef CONFIG_S3C2410
157 #define CONFIG_NAND_S3C2410
158 #define CONFIG_SYS_S3C2410_NAND_HWECC
159 +#else
160 +#define CONFIG_NAND_S3C2440
161 +#define CONFIG_SYS_S3C2440_NAND_HWECC
162 +#endif
163 #define CONFIG_SYS_MAX_NAND_DEVICE 1
164 #define CONFIG_SYS_NAND_BASE 0x4E000000
165 #endif
使用loady进行烧录,现在串口输入loady 30000000,之后按ctrl+A，之后按s,选择ymodel，选择文件即可使用loady进行烧录
烧录到Norflash
烧录到nandflash：
启动，识别到nandflash：
八、支持DM9000:
根据下图可知uboot支持的是cs8900网卡，我们使用的是DM9000网卡，因此需要把dm9000编译进uboot而不是cs8900,在配置文件添加这个宏CONFIG_DRIVER_DM9000
根据下面的原理图可知DM9000是使用nGCS4作为片选引脚,内存的基地址要设置为0x2000_0000 ，
代码修改如下，BANKCON4用于修改DM9000的时序:
zhuang@zhuang:~/project/3-jz2440/systems/u-boot-2012.04.01$ git diff .
diff --git a/board/samsung/smdk2440/lowlevel_init.S b/board/samsung/smdk2440/lowlevel_init.S
index c14cab3..0adf662 100644
--- a/board/samsung/smdk2440/lowlevel_init.S
+++ b/board/samsung/smdk2440/lowlevel_init.S
@@ -157,7 +157,7 @@ SMRDATA:
.long 0x00000700 //BANKCON1
.long 0x00000700 //BANKCON2
.long 0x00000700 //BANKCON3
-.long 0x00000700 //BANKCON4
+.long 0x00000740 //BANKCON4
.long 0x00000700 //BANKCON5
.long 0x00018005 //BANKCON6
.long 0x00018005 //BANKCON7
diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
index 6f5710d..780adb7 100644
--- a/include/configs/smdk2440.h
+++ b/include/configs/smdk2440.h
@@ -55,10 +55,17 @@
/*
* Hardware drivers
*/
+ # if 0
#define CONFIG_CS8900 /* we have a CS8900 on-board */
#define CONFIG_CS8900_BASE 0x19000300
#define CONFIG_CS8900_BUS16 /* the Linux driver does accesses as shorts */
+#else
+#define CONFIG_DRIVER_DM9000
+#define CONFIG_DM9000_BASE 0x20000000
+#define DM9000_IO CONFIG_DM9000_BASE
+#define DM9000_DATA (CONFIG_DM9000_BASE + 4)
+#endif
/*
* select serial console configuration
*/
编译烧录：现象如下,显示没有找到网卡:
在uboot里网卡初始化流程如下,由于没有修改成DM9000的初始化导致的:
puts("Net: ");
eth_initialize(gd->bd);
|
int board_eth_init(bd_t *bis)
{
int rc = 0;
#ifdef CONFIG_CS8900
rc = cs8900_initialize(0, CONFIG_CS8900_BASE);
#endif
return rc;
}
#endif
代码修改如下:
1 diff --git a/board/samsung/smdk2440/smdk2410.c b/board/samsung/smdk2440/smdk2410.c
2 index 44f38d1..b56f8aa 100644
3 --- a/board/samsung/smdk2440/smdk2410.c
4 +++ b/board/samsung/smdk2440/smdk2410.c
5 @@ -138,6 +138,11 @@ int board_eth_init(bd_t *bis)
6 #ifdef CONFIG_CS8900
7 rc = cs8900_initialize(0, CONFIG_CS8900_BASE);
8 #endif
9 +
10 +#ifdef CONFIG_DRIVER_DM9000
11 + rc = dm9000_initialize(bis);
12 +#endif
13 +
14 return rc;
15 }
16 #endif
编译烧录现象如下，识别到DM9000,并且ping成功:
使用tftp下载：
安装相关的软件
1 apt-get install tftp-hpa tftpd-hpa xinetd
修改配置文件:
sudo vim /etc/default/tftpd-hpa
# /etc/default/tftpd-hpa
TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/tftpboot"
TFTP_ADDRESS=":69"
TFTP_OPTIONS="--secure"
创建tftp的目录
1 sudo mkdir /tftpboot
2 sudo chmod 777 /tftpboot
使用tftp下载内核实验如下,成功下载内核，因此uboot对应dm9000的修改暂时没有问题:
九、修改默认参数以及裁剪uboot
代码修改如下：
1 zhuang@zhuang:~/project/3-jz2440/systems/u-boot-2012.04.01$ git diff .
2 diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
3 index 6cd7352..634f4c8 100644
4 --- a/arch/arm/lib/board.c
5 +++ b/arch/arm/lib/board.c
6 @@ -654,6 +654,9 @@ void board_init_r(gd_t *id, ulong dest_addr)
7 }
8 #endif
9
10 + //mtdparts_init();
11 + run_command("mtdparts default",0); //在执行mtdpart之前需要运行mtdparts default 进行初始化设置
12 +
13 /* main_loop() can return to retry autoboot, if so just run it again. */
14 for (;;) {
15 main_loop();
16 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
17 index bb3f227..709071d 100644
18 --- a/include/configs/smdk2440.h
19 +++ b/include/configs/smdk2440.h
20 @@ -75,15 +75,15 @@
21 /************************************************************
22 * USB support (currently only works with D-cache off)
23 ************************************************************/
24 -#define CONFIG_USB_OHCI
25 -#define CONFIG_USB_KEYBOARD
26 -#define CONFIG_USB_STORAGE
27 -#define CONFIG_DOS_PARTITION
28 +//#define CONFIG_USB_OHCI //裁剪没有用到的模块
29 +//#define CONFIG_USB_KEYBOARD
30 +//#define CONFIG_USB_STORAGE
31 +//#define CONFIG_DOS_PARTITION
32
33 /************************************************************
34 * RTC
35 ************************************************************/
36 -#define CONFIG_RTC_S3C24X0
37 +//#define CONFIG_RTC_S3C24X0
38
39
40 #define CONFIG_BAUDRATE 115200
41 @@ -91,10 +91,10 @@
42 /*
43 * BOOTP options
44 */
45 -#define CONFIG_BOOTP_BOOTFILESIZE
46 -#define CONFIG_BOOTP_BOOTPATH
47 -#define CONFIG_BOOTP_GATEWAY
48 -#define CONFIG_BOOTP_HOSTNAME
49 +//#define CONFIG_BOOTP_BOOTFILESIZE
50 +//#define CONFIG_BOOTP_BOOTPATH
51 +//#define CONFIG_BOOTP_GATEWAY
52 +//#define CONFIG_BOOTP_HOSTNAME
53
54 /*
55 * Command line configuration.
56 @@ -103,13 +103,13 @@
57
58 #define CONFIG_CMD_BSP
59 #define CONFIG_CMD_CACHE
60 -#define CONFIG_CMD_DATE
61 -#define CONFIG_CMD_DHCP
62 +//#define CONFIG_CMD_DATE
63 +//#define CONFIG_CMD_DHCP
64 #define CONFIG_CMD_ELF
65 #define CONFIG_CMD_NAND
66 #define CONFIG_CMD_PING
67 #define CONFIG_CMD_REGINFO
68 -#define CONFIG_CMD_USB
69 +//#define CONFIG_CMD_USB
70
71 #define CONFIG_SYS_HUSH_PARSER
72 #define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
73 @@ -162,7 +162,7 @@
74
75
76 #define CONFIG_BOOTARGS "console=ttySAC0 root=/dev/mtdblock3"
77 -#define CONFIG_BOOTCOMMAND "nand read 30000000 0xabc 0x200000;bootm 30000000"
78 +#define CONFIG_BOOTCOMMAND "nand read 30000000 kernel 0x200000;bootm 30000000"
79 #define CONFIG_ETHADDR "00:06:3b:01:41:55"
80 /*-----------------------------------------------------------------------
81 * Stack sizes
82 @@ -200,11 +200,28 @@
83 #define CONFIG_SYS_FLASH_BANKS_LIST { CONFIG_SYS_FLASH_BASE }
84 #define CONFIG_SYS_MAX_FLASH_SECT (128)
85
86 +#if 0
87 #define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + 0x070000)
88 #define CONFIG_ENV_IS_IN_FLASH
89 #define CONFIG_ENV_SIZE 0x10000
90 /* allow to overwrite serial and ethaddr */
91 #define CONFIG_ENV_OVERWRITE
92 +#endif
93 +
94 +#define CONFIG_ENV_IS_IN_NAND
95 +#define CONFIG_ENV_OFFSET 0x00040000 //设置params分区存放的大小和便宜
96 +#define CONFIG_ENV_SIZE 0x20000 /* nand blcok size */
97 +#define CONFIG_ENV_RANGE CONFIG_ENV_SIZE
98 +
99 +#define CONFIG_CMD_MTDPARTS
100 +#define CONFIG_MTD_DEVICE
101 +#define MTDIDS_DEFAULT "nand0=jz2440-0" // which device
102 + //mtdparts 命令对nandflash的划分
103 +#define MTDPARTS_DEFAULT "mtdparts=jz2440-0:256k(u-boot)," \
104 + "128k(params)," \
105 + "2m(kernel)," \
106 + "-(rootfs)"
107 +
108
109 /*
110 * Size of malloc() pool
111 @@ -234,6 +251,7 @@
112 /*
113 * File system
114 */
115 + #if 0
116 #define CONFIG_CMD_FAT
117 #define CONFIG_CMD_EXT2
118 #define CONFIG_CMD_UBI
119 @@ -241,9 +259,9 @@
120 #define CONFIG_CMD_MTDPARTS
121 #define CONFIG_MTD_DEVICE
122 #define CONFIG_MTD_PARTITIONS
123 -//#define CONFIG_YAFFS2
124 +#define CONFIG_YAFFS2
125 #define CONFIG_RBTREE
126 -
127 +#endif
128 /* additions for new relocation code, must be added to all boards */
129 #define CONFIG_SYS_SDRAM_BASE PHYS_SDRAM_1
130 #define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + 0x1000 - \
设置默认的环境变量修改文件include/configs/smdk2440.h
1 /*
2 * select serial console configuration
3 */
4 @@ -115,8 +122,8 @@
5 #define CONFIG_ZERO_BOOTDELAY_CHECK
6
7 #define CONFIG_NETMASK 255.255.255.0
8 -#define CONFIG_IPADDR 10.0.0.110
9 -#define CONFIG_SERVERIP 10.0.0.1
10 +#define CONFIG_IPADDR 192.168.1.17
11 +#define CONFIG_SERVERIP 192.168.1.100
12
13 #if defined(CONFIG_CMD_KGDB)
14 #define CONFIG_KGDB_BAUDRATE 115200 /* speed to run kgdb serial port */
15 @@ -153,6 +160,10 @@
16 #define CONFIG_LZO
17 #define CONFIG_LZMA
18
19 +
20 +#define CONFIG_BOOTARGS "console=ttySAC0 root=/dev/mtdblock3"
21 +#define CONFIG_BOOTCOMMAND "nand read 30000000 0xabc 0x200000;bootm 30000000"
22 +#define CONFIG_ETHADDR "00:06:3b:01:41:55"
23 /*-----------------------------------------------------------------------
编译烧录，设置默认的环境变量生效:
tftp下载uboot到sdram，解除写保护，擦除分区，从内存拷贝到norflash。
下载内核到nandflash
从nandflash读到sdram并启动
支持mtdpart命令:
利用分区名进行烧录，擦除等操作
十、uboot支持jffs2文件系统烧录,默认支持jffs2文件系统烧录
支持yaffs2文件系统,代码修改如下:
1 diff --git a/drivers/mtd/nand/nand_util.c b/drivers/mtd/nand/nand_util.c
2 old mode 100644
3 new mode 100755
4 index 60c778e..f9c4a88
5 --- a/drivers/mtd/nand/nand_util.c
6 +++ b/drivers/mtd/nand/nand_util.c
7 @@ -515,7 +515,7 @@ int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
8 return -EINVAL;
9 }
10
11 - if (!need_skip && !(flags & WITH_DROP_FFS)) {
12 + if (!need_skip && !(flags & WITH_DROP_FFS) && !(flags & WITH_YAFFS_OOB)) {
13 rval = nand_write (nand, offset, length, buffer);
14 if (rval == 0)
15 return 0;
16 @@ -553,7 +553,7 @@ int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
17
18 ops.len = pagesize;
19 ops.ooblen = nand->oobsize;
20 - ops.mode = MTD_OOB_AUTO;
21 + ops.mode = MTD_OOB_RAW;
22 ops.ooboffs = 0;
23
24 pages = write_size / pagesize_oob;
25 @@ -564,7 +564,7 @@ int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
26 ops.oobbuf = ops.datbuf + pagesize;
27
28 rval = nand->write_oob(nand, offset, &ops);
29 - if (!rval)
30 + if (rval)
31 break;
32
33 offset += pagesize;
34 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
35 index 709071d..dc25330 100644
36 --- a/include/configs/smdk2440.h
37 +++ b/include/configs/smdk2440.h
38 @@ -160,7 +160,7 @@
39 #define CONFIG_LZO
40 #define CONFIG_LZMA
41
42 -
43 +#define CONFIG_CMD_NAND_YAFFS
44 #define CONFIG_BOOTARGS "console=ttySAC0 root=/dev/mtdblock3"
45 #define CONFIG_BOOTCOMMAND "nand read 30000000 kernel 0x200000;bootm 30000000"
46 #define CONFIG_ETHADDR "00:06:3b:01:41:55"
更新uboot
烧录yaffs文件系统
使用yaffs文件系统启动Ok
觉得不错，就给我点小支持吧，蟹蟹