(1)、建立自己s3c2410开发板的配置
1)# cp –r board/smdk2410 board/s3c2410
2)# cp include/configs/smdk2410.h include/configs/s3c2410.h
s3c2410.h是开发板的配置文件,他包括开发板的CPU、系统时钟、RAM、FLASH系统及其他相关的配置信息,由于u-boot已经支持三星的SMDK2410开发板,所以移植的时候直接拷贝SMDK2410的配置文件,做相应的修改即可。由于Uboot对SMDK2410板的NAND Flash初始化部分没有写,即lib_arm/board.c中的start_armboot函数中有这么一句:
#if (CONFIG_COMMANDS & CFG_CMD_NAND)
puts ("NAND:");
nand_init();
#endif
但是在board/smdk2410目录下源文件中都没有定义nand_init这个函数。所以需要我们补充这个函数以及这个函数涉及的底层操作,NAND Flash的读写操作相对复杂,将在u-boot- 1.1.6移植的第二部分介绍。
(2). 修改顶层Makefile
cd /uboot/u-boot-1.1.6
vi Makefile
找到:
smdk2410_config : unconfig
@$(MKCONFIG) $(@:_config=) arm arm920t smdk2410 NULL s3c24x0
在其后面添加:
s3c2410_config : unconfig
@$(MKCONFIG) $(@:_config=) arm arm920t s3c2410 NULL s3c24x0
各项的意思如下:
arm: CPU的架构(ARCH)
arm920t: CPU的类型(CPU),其对应于cpu/arm920t子目录。
s3c2410: 开发板的型号(BOARD),对应于board/s3c2410目录。
NULL: 开发者/或经销商(vender)。
s3c24x0: 片上系统(SOC)。
(3). include/configs/s3c2410.h:
修改:
# define CFG_PROMPT “SMDK2410 #”
为:
# define CFG_PROMPT “GUET2410 #”
这是u-boot的命令行提示符。
(4) 修改board/s3c2410/Makefile
将:
OBJS := smdk2410.o flash.o
改为:
OBJS := s3c2410.o flash.o
当然,s3c2410下的 smdk2410.c要改成s3c2410.c;
(5)依照你自己开发板的内存地址分配情况修改board/s3c2410/lowlevel_init.S文件
这里我参考了FS2410开发板自带S3C2410_BIOS,代码如下:
#include
#include
#define BWSCON 0x48000000
#define DW8 (0x0)
#define DW16 (0x1)
#define DW32 (0x2)
#define WAIT (0x1<<2)
#define UBLB (0x1<<3)
#define B1_BWSCON (DW16)
#define B2_BWSCON (DW16)
#define B3_BWSCON (DW16 + WAIT + UBLB)
#define B4_BWSCON (DW16)
#define B5_BWSCON (DW16)
#define B6_BWSCON (DW32)
#define B7_BWSCON (DW32)
#define B0_Tacs 0x3
#define B0_Tcos 0x3
#define B0_Tacc 0x7
#define B0_Tcoh 0x3
#define B0_Tah 0x3
#define B0_Tacp 0x1
#define B0_PMC 0x0
#define B1_Tacs 0x3
#define B1_Tcos 0x3
#define B1_Tacc 0x7
#define B1_Tcoh 0x3
#define B1_Tah 0x3
#define B1_Tacp 0x3
#define B1_PMC 0x0
#define B2_Tacs 0x0
#define B2_Tcos 0x0
#define B2_Tacc 0x7
#define B2_Tcoh 0x0
#define B2_Tah 0x0
#define B2_Tacp 0x0
#define B2_PMC 0x0
#define B3_Tacs 0x0
#define B3_Tcos 0x3
#define B3_Tacc 0x7
#define B3_Tcoh 0x1
#define B3_Tah 0x0
#define B3_Tacp 0x3
#define B3_PMC 0x0
#define B4_Tacs 0x1
#define B4_Tcos 0x1
#define B4_Tacc 0x6
#define B4_Tcoh 0x1
#define B4_Tah 0x1
#define B4_Tacp 0x0
#define B4_PMC 0x0
#define B5_Tacs 0x1
#define B5_Tcos 0x1
#define B5_Tacc 0x6
#define B5_Tcoh 0x1
#define B5_Tah 0x1
#define B5_Tacp 0x0
#define B5_PMC 0x0
#define B6_MT 0x3
#define B6_Trcd 0x1
#define B6_SCAN 0x1
#define B7_MT 0x3
#define B7_Trcd 0x1
#define B7_SCAN 0x1
#define REFEN 0x1
#define TREFMD 0x0
#define Trp 0x0
#define Trc 0x3
#define Tchr 0x2
#define REFCNT 1113
(6)在board/s3c2410加入NAND Flash读函数,建立nand_read.c,加入如下内容(copy from vivi):
#include
#include "linux/mtd/mtd.h"
#include "linux/mtd/nand.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
inline void wait_idle(void) {
int i;
while(!(NFSTAT & BUSY))
for(i=0; i<10; i++);
}
#define NAND_SECTOR_SIZE 512
#define NAND_BLOCK_MASK (NAND_SECTOR_SIZE - 1)
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;
}
NFCONF &= ~0x800;
for(i=0; i<10; i++);
for(i=start_addr; i < (start_addr + size);) {
NFCMD = 0;
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++;
}
}
NFCONF |= 0x800;
return 0;
}
(7)修改cpu/arm920t/start.S文件
2410的启动代码可以在外部的NAND FLASH上执行,启动时,NAND FLASH的前4KB(地址为0x00000000,OM[1:0]=0)将被装载到SDRAM中被称为Setppingstone的地址中,然后开始执行这段代码。启动以后,这4KB的空间可以做其他用途,在start.S加入搬运代码如下:
...........
...........
copy_loop:
ldmia r0!, {r3-r10}
stmia r1!, {r3-r10}
cmp r0, r2
ble copy_loop
#ifdef CONFIG_S3C2410_NAND_BOOT
bl copy_myself
#endif
#endif
stack_setup:
..................
#ifdef CONFIG_S3C2410_NAND_BOOT
copy_myself:
mov r10, lr
@ 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
1: add r3, r3, #0x1
cmp r3, #0xa
blt 1b
2: ldr r2, [r1, #oNFSTAT] @ wait ready
tst r2, #0x1
beq 2b
ldr r2, [r1, #oNFCONF]
orr r2, r2, #0x800 @ disable chip
str r2, [r1, #oNFCONF]
@ get read to call C functions
ldr sp, DW_STACK_START @ setup stack pointer
mov fp, #0 @ no previous frame, so fp=0
@ copy UBOOT to RAM
ldr r0, _TEXT_BASE
mov r1, #0x0
mov r2, #0x20000
bl nand_read_ll
teq r0, #0x0
beq ok_nand_read
bad_nand_read:
1: b 1b @ 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 done_nand_read
bne go_next
notmatch:
1: b 1b
done_nand_read:
mov pc, r10
#endif
@ CONFIG_S3C2440_NAND_BOOT
DW_STACK_START:
.word STACK_BASE+STACK_SIZE-4
(8)修改include/configs/s3c2410.h文件,添加如下内容:
#define CONFIG_S3C2410_NAND_BOOT 1
#define STACK_BASE 0x33f00000
#define STACK_SIZE 0x8000
#define UBOOT_RAM_BASE 0x30100000
#define NAND_CTL_BASE 0x4e000000
#define bINT_CTL(Nb) _REG(INT_CTL_BASE+(Nb))
#define oNFCONF 0x00
#define oNFCMD 0x04
#define oNFADDR 0x08
#define oNFDATA 0x0c
#define oNFSTAT 0x10
#define oNFECC 0x14
#define NAND_MAX_CHIPS 1
(9)修改board/s3c2410/Makefile
OBJS := s3c2410.o flash.o nand_read.o
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