1. 下载u-boot-1.1.4.tar.bz2,并解压
2. 将arm-linux-2.95.3复制到/usr/local/arm/2.95.3/
3. 编辑u-boot跟目录的Makefile文件
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代码:
include $(TOPDIR)/config.mk
CROSS_COMPILE=/usr/local/arm/2.95.3/bin/arm-linux-
ifndef CROSS_COMPILE复制内容到剪贴板
代码:
smdk2410_config : unconfig
@./mkconfig $(@:_config=) arm arm920t smdk2410 NULL s3c24x0
sky2410_config : unconfig
@./mkconfig $(@:_config=) arm arm920t sky2410 NULL s3c24x0
SX1_config : unconfig
@./mkconfig $(@:_config=) arm arm925t sx14. 复制必要的文件
cp -arf board/smdk2410/ board/sky2410
mv board/sky2410/smdk2410.c board/sky2410/sky2410.c
cp include/configs/smdk2410.h include/configs/sky2410.h
5. 修改board/sky2410/Makefile
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代码:
LIB = lib$(BOARD).a
OBJS := sky2410.o flash.o
SOBJS := lowlevel_init.o6. make 测试一下
make sky2410_config
make
出现错误
cc1: Invalid option `abi=apcs-gnu'
修改文件cpu/arm920t/config.mk
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代码:
PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu)改成：
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代码:
PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,$(call cc-option,-mabi=apcs-gnu),)再make成功
7. 开始移植nand
修改cpu/arm920t/start.S
将从Flash启动改成从NAND Flash启动。
将以下U－Boot的重定向语句段：
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代码:
#ifndef CONFIG_SKIP_RELOCATE_UBOOT
relocate: /* relocate U-Boot to RAM */
adr r0, _start /* r0 <- current position of code */
ldr r1, _TEXT_BASE /* test if we run from flash or RAM */
cmp r0, r1 /* don't reloc during debug */
beq stack_setup
ldr r2, _armboot_start
ldr r3, _bss_start
sub r2, r3, r2 /* r2 <- size of armboot */
add r2, r0, r2 /* r2 <- source end address */
copy_loop:
ldmia r0!, {r3-r10} /* copy from source address [r0] */
stmia r1!, {r3-r10} /* copy to target address [r1] */
cmp r0, r2 /* until source end addreee [r2] */
ble copy_loop
#endif /* CONFIG_SKIP_RELOCATE_UBOOT */替换成：
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代码:
#ifdef CONFIG_S3C2410_NAND_BOOT
@ reset NAND
mov r1, #NAND_CTL_BASE
ldr r2, =0xf830 @ initial value
str r2, [r1, #oNFCONF]
ldr r2, [r1, #oNFCONF]
bic r2, r2, #0x800 @ enable chip
str r2, [r1, #oNFCONF]
mov r2, #0xff @ RESET command
strb r2, [r1, #oNFCMD]
mov r3, #0 @ wait
nand1:
add r3, r3, #0x1
cmp r3, #0xa
blt nand1
nand2:
ldr r2, [r1, #oNFSTAT] @ wait ready
tst r2, #0x1
beq nand2
ldr r2, [r1, #oNFCONF]
orr r2, r2, #0x800 @ disable chip
str r2, [r1, #oNFCONF]
@ get read to call C functions (for nand_read())
ldr sp, DW_STACK_START @ setup stack pointer
mov fp, #0 @ no previous frame, so fp=0
@ copy U-Boot to RAM
ldr r0, =TEXT_BASE
mov r1, #0x0
mov r2, #0x20000
bl nand_read_ll
tst r0, #0x0
beq ok_nand_read
bad_nand_read:
loop2: b loop2 @ infinite loop
ok_nand_read:
@ verify
mov r0, #0
ldr r1, =TEXT_BASE
mov r2, #0x400 @ 4 bytes * 1024 = 4K-bytes
go_next:
ldr r3, [r0], #4
ldr r4, [r1], #4
teq r3, r4
bne notmatch
subs r2, r2, #4
beq stack_setup
bne go_next
notmatch:
loop3: b loop3 @ infinite loop
#endif /* CONFIG_S3C2410_NAND_BOOT */在 “ _start_armboot: .word start_armboot ” 后加入：
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代码:
.align 2
DW_STACK_START: .word STACK_BASE+STACK_SIZE-48.
(I)修改board/sky2410/Makefile
OBJS := sky2410.o flash.o nand_read.o
(II)创建board/sky2410/nand_read.c文件
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代码:
#include <config.h>
#define __REGb(x) (*(volatile unsigned char *)(x))
#define __REGi(x) (*(volatile unsigned int *)(x))
#define NF_BASE 0x4e000000
#define NFCONF __REGi(NF_BASE + 0x0)
#define NFCMD __REGb(NF_BASE + 0x4)
#define NFADDR __REGb(NF_BASE + 0x8)
#define NFDATA __REGb(NF_BASE + 0xc)
#define NFSTAT __REGb(NF_BASE + 0x10)
#define BUSY 1
#ifndef NAND_SECTOR_SIZE
#define NAND_SECTOR_SIZE 512
#endif
#ifndef
#define NAND_BLOCK_MASK 511
#endif
inline void wait_idle(void) {
int i;
while(!(NFSTAT & BUSY))
for(i=0; i<10; i++);
}
/* low level nand read function */
int
nand_read_ll(unsigned char *buf, unsigned long start_addr, int size)
{
int i, j;
if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK)) {
return -1; /* invalid alignment */
}
/* chip Enable */
NFCONF &= ~0x800;
for(i=0; i<10; i++);
for(i=start_addr; i < (start_addr + size);) {
/* READ0 */
NFCMD = 0;
/* Write Address */
NFADDR = i & 0xff;
NFADDR = (i >> 9) & 0xff;
NFADDR = (i >> 17) & 0xff;
NFADDR = (i >> 25) & 0xff;
wait_idle();
for(j=0; j < NAND_SECTOR_SIZE; j++, i++) {
*buf = (NFDATA & 0xff);
buf++;
}
}
/* chip Disable */
NFCONF |= 0x800; /* chip disable */
return 0;
}9.修改include/configs/sky2410.h
在文件的后部添加
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代码:
/*
* Nandflash Boot
*/
#define CONFIG_S3C2410_NAND_BOOT 1
#define STACK_BASE 0x33f00000
#define STACK_SIZE 0x8000
//#define UBOOT_RAM_BASE 0x33f80000
/* NAND Flash Controller */
#define NAND_CTL_BASE 0x4E000000
#define bINT_CTL(Nb) __REG(INT_CTL_BASE + (Nb))
/* Offset */
#define oNFCONF 0x00
#define oNFCMD 0x04
#define oNFADDR 0x08
#define oNFDATA 0x0c
#define oNFSTAT 0x10
#define oNFECC 0x1410.
make 测试一下啊
到这里 u-boot 已经可以从nand启动了
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本帖最后由 zbluecn 于 2008-3-3 17:18 编辑 ]
