根据上一篇的移植，我们可以尝试load进ram试试能不能起来
将生成的u-boot.bin放到tftpserver，在小板串口上配置好ip然后下载文件，但go之后并没有起来
SMDK6410 # setenv ipaddr 192.168.0.22
SMDK6410 # setenv serverip 192.168.0.88
SMDK6410 # tftp 50008000 u-boot.bin
Found DM9000 ID:90000a46 at address 18000300 !
DM9000 work in 16 bus width
bd->bi_entaddr: 00:40:5c:26:0a:5b
[eth_init]MAC:0:40:5c:26:a:5b:
TFTP from server 192.168.0.88; our IP address is 192.168.0.22
Filename 'u-boot.bin'.
Load address: 0x50008000
Loading: T T #######################################
done
Bytes transferred = 195996 (2fd9c hex)
SMDK6410 # nand erase 0 100000
NAND erase: device 0 offset 0x0, size 0x100000
Erasing at 0x80000 -- 100% complete.
OK
SMDK6410 # nand write.uboot 50008000 0 100000
NAND write: device 0 offset 0x0, size 0x100000
1032192 bytes written: OK
SMDK6410 # reset
reset...
而之前烧录用的u-boot_256ram.bin，是可以起来的
SMDK6410 # tftp 50008000 u-boot_ram256.bin
Found DM9000 ID:90000a46 at address 18000300 !
DM9000 work in 16 bus width
bd->bi_entaddr: 00:40:5c:26:0a:5b
[eth_init]MAC:0:40:5c:26:a:5b:
TFTP from server 192.168.0.88; our IP address is 192.168.0.22
Filename 'u-boot.bin'.
Load address: 0x50008000
Loading: T T #######################################
done
Bytes transferred = 195996 (2fd9c hex)
SMDK6410 # nand erase 0 100000
NAND erase: device 0 offset 0x0, size 0x100000
Erasing at 0x80000 -- 100% complete.
OK
SMDK6410 # nand write.uboot 50008000 0 100000
NAND write: device 0 offset 0x0, size 0x100000
1032192 bytes written: OK
SMDK6410 # reset
reset...
U-Boot 1.1.6 (Sep 19 2014 - 10:00:03) for SMDK6410
****************************************
** u-boot 1.1.6 **
** Updated for OK6410 TE6410 Board **
** Version (2012-09-23) **
** OEM: Forlinx Embedded **
** Web: http://www.witech.com.cn **
****************************************
可见采用默认的smdk6400是不行的，因此需要进一步修改启动参数
参照下面链接
http://wenku.baidu.com/link?url=z6OQVjFgnAEQ_-ZlLTHRzvC6Rr9ALoQOlGsw4hvYjPGRCy4JHjsklFS3PsIveLHHGAv1augT4lcnAs-DndoVOCvJLcwcogTPSTqWs0Qhbzi
http://www.cnblogs.com/plinx/category/460408.html
1、启动模块修改
进入/cpu/arm1176/目录，修改start.S文件
首先找到需要修改的CONFIG_NAND_SPL汇编原码，修改如下：
#ifndef CONFIG_NAND_SPL
/*
* 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
//将原来之间的内容删除
mcr p15, 0, r0, c1, c0, 0
#endif
/* when we already run in ram, we don't need to relocate U-Boot.这段代码是判断到底是从nandflash中启动还是从ram中启动。1.如果是从nandflash中启动，那么PC的值一定在4K之内。那么执行完bicr1,pc,r0之后，r1为0。_TEXT_BASE要么等于0x57e00000,要么等于0xC7e00000.那么执行完bicr2,r2,r0之后，r2为0x00e00000，那么不相等，则不跳转，下面应该就是copy_from_nand。2.如果是从ram中启动，那么PC的值为0xx7e00000。那么执行完bicr1,pc,r0之后，r1为0x00e00000。_TEXT_BASE要么等于0x57e00000,要么等于0xC7e00000.那么执行完bicr2,r2,r0之后，r2为0x00e00000，那么相等，跳转到after_copy，也就是不需要copy。
* 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 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 */
承接上面分析，如果没有完成copy，则接下来就是copy_from_nand。
紧接着前面的代码beq after_copy之后添加下面一段代码：
#ifdef CONFIG_BOOT_NAND
mov r0, #0x1000
bl copy_from_nand
#endif
此处的 bl 为调用子程序，接着上面的是因为未复制完成从新跳回 copy_from_nand 从新复制nandflash
然后找到_mmu_table_base，在它的#endif之后，添加如下代码，即上面所跳转的目标代码
/*
* copy U-Boot to SDRAM and jump to ram (from NAND or OneNAND)
* r0: size to be compared
* Load 1'st 2blocks to RAM because U-boot's size is larger than 1block(128k) size
*/
.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
至此，start.S文件修改完成。
2.接着在/cpu/arm1176/目录下添加一个nand_cp.c文件
代码如下
#include <common.h>
#ifdef CONFIG_S3C64XX
#include <asm/io.h>
#include <linux/mtd/nand.h>
#include <asm/arch/s3c6410.h>
static int nandll_read_page (uchar *buf, ulong addr, int large_block)
{
int i;
int page_size = 512;
/* 2K */
if (large_block==1)
page_size = 2048;
/* 4K */
if (large_block==2)
page_size = 4096;
NAND_ENABLE_CE();
NFCMD_REG = NAND_CMD_READ0;
/* Write Address */
NFADDR_REG = 0;
if (large_block)
NFADDR_REG = 0;
NFADDR_REG = (addr) & 0xff;
NFADDR_REG = (addr >> 8) & 0xff;
NFADDR_REG = (addr >> 16) & 0xff;
if (large_block)
NFCMD_REG = NAND_CMD_READSTART;
NF_TRANSRnB();
/* for compatibility(2460). u32 cannot be used. by scsuh */
for(i=0; i < page_size; i++)
{
*buf++ = NFDATA8_REG;
}
NAND_DISABLE_CE();
return 0;
}
static int nandll_read_blocks (ulong dst_addr, ulong size, int large_block)
{
uchar *buf = (uchar *)dst_addr;
int i;
uint page_shift = 9;
if (large_block==1)
page_shift = 11;
/* Read pages */
if(large_block==2)
page_shift = 12;
if(large_block == 2)
{
/* Read pages */
for (i = 0; i < 4; i++, buf+=(1<<(page_shift-1)))
{
nandll_read_page(buf, i, large_block);
}
/* Read pages */
/* 0x3c000 = 11 1100 0000 0000 0000 */
for (i = 4; i < (0x3c000>>page_shift); i++, buf+=(1<<page_shift))
{
nandll_read_page(buf, i, large_block);
}
}
else
{
for (i = 0; i < (0x3c000>>page_shift); i++, buf+=(1<<page_shift))
{
nandll_read_page(buf, i, large_block);
}
}
return 0;
}
int copy_uboot_to_ram(void)
{
int large_block = 0;
int i;
vu_char id;
/*
#define NAND_ENABLE_CE() (NFCONT_REG &= ~(1 << 1))
#define NFCONT_REG
__REG(ELFIN_NAND_BASE + NFCONT_OFFSET)
#define __REG(x) (*((volatile u32 *)(x)))
#define ELFIN_NAND_BASE 0x70200000
#define NFCONT_OFFSET 0x04
NFCONT_REG = ( *( (volatile u32 *) (0x70200004) ) )
NFCONT 0x70200004 读/写NAND Flash 控制寄存器
[0]1：NAND Flash 控制器使能
*/
NAND_ENABLE_CE();
/*
#define NFCMD_REG
__REG(ELFIN_NAND_BASE + NFCMMD_OFFSET)
#define ELFIN_NAND_BASE 0x70200000
#define NFCMMD_OFFSET 0x08
NFCMD_REG = ( *( (volatile u32 *) (0x70200008) ) )
NFCMMD 0x70200008 NAND Flash 命令设置寄存器0
#define NAND_CMD_READID 0x90
*/
NFCMD_REG = NAND_CMD_READID;
/*
#define NFADDR_REG
__REG(ELFIN_NAND_BASE + NFADDR_OFFSET)
#define ELFIN_NAND_BASE 0x70200000
#define NFADDR_OFFSET 0x0C
NFADDR_REG = ( *( (volatile u32 *) (0x7020000C) ) )
NFADDR 0x7020000C NAND Flash 地址设置寄存器
*/
NFADDR_REG = 0x00;
/*
#define NFDATA8_REG
__REGb(ELFIN_NAND_BASE + NFDATA_OFFSET)
#define __REGb(x) (*(vu_char *)(x))
NFDATA8_REG = ( *( (vu_char *) (0x70200010) ) )
NFDATA 0x70200010 读/写NAND Flash 数据寄存器
NAND Flash 读/烧写数据值用于I/O
*/
/* wait for a while */
for (i=0; i<200; i++);
id = NFDATA8_REG;
id = NFDATA8_REG;
if (id > 0x80)
large_block = 1;
if(id == 0xd5)
large_block = 2;
/* read NAND Block.
* 128KB ->240KB because of U-Boot size increase. by scsuh
* So, read 0x3c000 bytes not 0x20000(128KB).
*/
/*
#define CONFIG_SYS_PHY_UBOOT_BASE
(CONFIG_SYS_SDRAM_BASE + 0x07e00000)
#define CONFIG_SYS_SDRAM_BASE 0x50000000
CONFIG_SYS_PHY_UBOOT_BASE = 0x57e0 0000
0x3 c000 = 1M
*/
return nandll_read_blocks(CONFIG_SYS_PHY_UBOOT_BASE, 0x3c000, large_block);
}
#endif
然后在/cpu/arm1176/makefile中添加一个依赖到COBJS目标后面
COBJS = cpu.o nand_cp.o
接着在/nand_spl/board/samsung/smdk6410/Makefile中添加一个依赖到COBJS后面
COBJS = nand_boot.o nand_ecc.o s3c64xx.o nand_cp.o
补全规则
# from SoC directory
$(obj)cpu_init.S:
@rm -f $@
@ln -s $(TOPDIR)/cpu/arm1176/s3c64xx/cpu_init.S $@
$(obj)nand_cp.c:
@rm -f $@
@ln -s $(TOPDIR)/cpu/arm1176/nand_cp.c $@
接着修改smdk6410.h文件（在/include/configs/目录下）：
1、添加宏定义
#define virt_to_phys(x) virt_to_phy_smdk6410(x)
2、用户名回显修改
#define CONFIG_SYS_PROMPT "SMDK6400 #"
3、添加smdk6410 ID
检索到MACH_TYPE，将其注释掉，然后添加smdk6410 ID如下
#define MACH_TYPE 1626
4、增加NAND config的内容
添加位置 /* NAND configuration */
#define NAND_DISABLE_CE()(NFCONT_REG |=(1<<1))
#define NAND_ENABLE_CE()(NFCONT_REG &=~(1<<1))
#define NF_TRANSRnB() do{while(!(NFSTAT_REG&(1<<0)));}while(0)
5、NAND flash 大小
//#define PHYS_SDRAM_1_SIZE 0x08000000 /* 128 MB in Bank #1 */
#define PHYS_SDRAM_1_SIZE 0x10000000 /* 256 MB in Bank #1 */
6、NAND flash块大小
/* NAND chip block size */
//#define CONFIG_SYS_NAND_BLOCK_SIZE (128 * 1024)
#define CONFIG_SYS_NAND_BLOCK_SIZE (512 * 1024)
7、NAND flash页大小
/* NAND chip page size */
//#define CONFIG_SYS_NAND_PAGE_SIZE 2048
#define CONFIG_SYS_NAND_PAGE_SIZE 4096
8、位校验
/* NAND chip page per block count */
//#define CONFIG_SYS_NAND_PAGE_COUNT 64
#define CONFIG_SYS_NAND_PAGE_COUNT 128
9、更改内存分配空间
/*
* Size of malloc() pool
*/
//#define CONFIG_SYS_MALLOC_LEN (CONFIG_ENV_SIZE + 1024 * 1024)
#define CONFIG_SYS_MALLOC_LEN (CONFIG_ENV_SIZE + 512 * 1024)
10、修改开机延迟时间
#define CONFIG_BOOTDELAY 3
11、设置SDRAM大小
//#define PHYS_SDRAM_1_SIZE 0x08000000 /* 128 MB in Bank #1 */
#define PHYS_SDRAM_1_SIZE 0x10000000 /* 256 MB in Bank #1 */
/* 后面的大小自己设定 这里是256MB的SDRAM */
12、修改SDROM大小
//#define CONFIG_SYS_MEMTEST_END (CONFIG_SYS_SDRAM_BASE + 0x7e00000) /* 126MB in DRAM */
#define CONFIG_SYS_MEMTEST_END (CONFIG_SYS_SDRAM_BASE + 0x9e00000) /* 256MB in DRAM */
13、PWM设置
//#define CONFIG_SYS_HZ 1000
#define CONFIG_SYS_HZ 1562500
14、堆栈大小
/*-----------------------------------------------------------------------
* Stack sizes
*
* The stack sizes are set up in start.S using the settings below
*/
//#define CONFIG_STACKSIZE 0x40000 /* regular stack 256KB */
#define CONFIG_STACKSIZE 0x80000 /* regular stack 512KB */
15、环境变量空间
//#define CONFIG_ENV_SIZE 0x4000 /* Total Size of Environment Sector */
#define CONFIG_ENV_SIZE 0x80000 /* Total Size of Environment Sector */
16、环境变量偏移地址
//#define CONFIG_ENV_OFFSET 0x0040000
#define CONFIG_ENV_OFFSET 0x0080000
17、BOOTCOMMAND
更改后的内容为
#ifdef CONFIG_ENABLE_MMU
#define CONFIG_SYS_MAPPED_RAM_BASE 0xc0000000
#define CONFIG_BOOTCOMMAND "nand read 0xc0008000 0x100000 0x500000;" \
"bootm 0xc0008000"
#else
#define CONFIG_SYS_MAPPED_RAM_BASE CONFIG_SYS_SDRAM_BASE
#define CONFIG_BOOTCOMMAND "nand read 0x50008000 0x100000 0x500000;" \
"bootm 0x50008000"
#endif
然后开始添加内容到u-boot.lds，在目录cpu/arm1176/还有uboot根目录下面都有
完善如下代码段
. = ALIGN(4);
.text :
{
cpu/arm1176/start.o (.text)
cpu/arm1176/s3c64xx/cpu_init.o (.text)
board/samsung/smdk6410/lowlevel_init.o (.text)
cpu/arm1176/nand_cp.o (.text)
lib_arm/board.o (.text)
*(.text)
}
添加内容到u-boot-nand.lds，在目录/board/samsung/smdk6410中
完善如下代码
. = ALIGN(4);
.text :
{
cpu/arm1176/start.o (.text)
cpu/arm1176/s3c64xx/cpu_init.o (.text)
board/samsung/smdk6410/lowlevel_init.o (.text)
cpu/arm1176/nand_cp.o (.text)
lib_arm/board.o (.text)
*(.text)
}
至此修改完成，开始编译，如果编译不通过或烧进去起不来，多半是因为代码位置或符合弄错了，一定要仔细检查
编译完成后，通过tftp将根目录下的u-boot.bin烧进去
SMDK6410 # setenv ipaddr 192.168.0.22
SMDK6410 # setenv serverip 192.168.0.88
SMDK6410 # tftp 50008000 u-boot.bin
Found DM9000 ID:90000a46 at address 18000300 !
DM9000 work in 16 bus width
bd->bi_entaddr: 00:40:5c:26:0a:5b
[eth_init]MAC:0:40:5c:26:a:5b:
TFTP from server 192.168.0.88; our IP address is 192.168.0.22
Filename 'u-boot.bin'.
Load address: 0x50008000
Loading: T T #######################################
done
Bytes transferred = 195996 (2fd9c hex)
SMDK6410 # nand erase 0 100000
NAND erase: device 0 offset 0x0, size 0x100000
Erasing at 0x80000 -- 100% complete.
OK
SMDK6410 # nand write.uboot 50008000 0 100000
NAND write: device 0 offset 0x0, size 0x100000
1032192 bytes written: OK
SMDK6410 # reset
reset...
U-Boot 2010.03-dirty (Feb 03 2016 - 14:39:43) for SMDK6410
CPU: S3C6400@533MHz
Fclk = 533MHz, Hclk = 133MHz, Pclk = 66MHz (ASYNC Mode)
Board: SMDK6410
DRAM: 256 MB
Flash: 0 kB
NAND: raise: Signal # 8 caught
raise: Signal # 8 caught
raise: Signal # 8 caught
No oob scheme defined for oobsize 32
4096 byte HW ECC not possible on 2048 byte page size, fallback to SW ECC
2048 MiB
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Net: CS8900-0
Hit any key to stop autoboot: 0
Kevin #
