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minis3c2440移植之uboot移植

作者：時間：2016-11-24 來源：網(wǎng)絡(luò)

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ldr r0, =CLKDIVN
mov r1,#5
str r1,[r0]

mrc p15,0,r1,c1,c0,0
orr r1, r1,#0xc0000000
mcr p15,0,r1,c1,c0,0

mov r1,#CLK_CTL_BASE
mov r2,#MDIV_405
add r2,r2,#PSDIV_405
str r2,[r1,#0x4]
#else
在#endif 之后添加以下Nandflash設(shè)置代碼：
#endif
#define LENGTH_UBOOT 0x60000
#define NAND_CTL_BASE 0x4E000000
#ifdef CONFIG_S3C2440_NAND_BOOT

@reset NAND
//#define oNFCONF 0x00
//#define oNFCONT 0x04
//#define oNFSTAT 0x08
//#define oNFCMD 0x20
mov r1,#NAND_CTL_BASE
ldr r2,=( (7<<12)|(7<<8)|(7<<4)|(0<<0))
str r2,[r1,#oNFCONF]
ldr r2,[r1,#oNFCONF]
ldr r2,=((1<<4)|(0<<1)|(1<<0))
str r2,[r1,#oNFCONT]
ldr r2,[r1,#oNFCONT]
ldr r2,=(0x6)
str r2,[r1,#oNFSTAT]
ldr r2,[r1,#oNFSTAT]
mov r2,#0xff
strb r2,[r1,#oNFCMD]
mov r3,#0
nand1:
add r3,r3,#0x1
cmp r3,#0xa
blt nand1
nand2:
ldr r2,[r1,#oNFSTAT]
tst r2,#0x4
beq nand2
ldr r2,[r1,#oNFCONT]
orr r2,r2,#0x2
str r2,[r1,#oNFCONT]
@get read to call C functions (for nand_read())
ldr sp,DW_STACK_START
mov fp,#0
@copy U-Boot to Ram
ldr r0,=TEXT_BASE
mov r1,#0x0
mov r2, #LENGTH_UBOOT //the u-boot¿s lenth
bl nand_read_ll
tst r0,#0x0
beq ok_nand_read
bad_nand_read:
loop2: b loop2
ok_nand_read:
@verify
mov r0,#0
ldr r1,=TEXT_BASE
mov r2,#0x400
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 @CONFIG_S3C2440_NAND_BOOT
#endif
在對BSS段清零操作代碼之后添加以點燈操作代碼：
#if defined(CONFIG_TOCORE2440_LED)
mov r1, #GPIO_CTL_BASE
add r1, r1, #oGPIO_B
ldr r2,=0x156aa
str r2, [r1, #oGPIO_CON]
mov r2, #0xff
str r2, [r1, #oGPIO_UP]
mov r2, #0x1c0
str r2, [r1, #oGPIO_DAT]
#endif
在_start_armboot: .word start_armboot跳轉(zhuǎn)代碼之后添加以下對堆棧段設(shè)置的代碼：
#define STACK_BASE 0x33f00000
#define STACK_SIZE 0x10000
.align 2
DW_STACK_START: .word STACK_BASE+STACK_SIZE-4
至此start.S文件修改完畢,整個配置文件修改完成。
3.在u-boot根目錄下執(zhí)行清理配置文件命令make distclean，并執(zhí)行命令make tocore2440_config命令，完成對u-boot的配置，添加交叉編譯工具環(huán)境變量：export PATH=/armtools/bin:$PATH(交叉編譯工具解壓在更目錄下)，再執(zhí)行make命令，完成U-boot編譯。

Linux內(nèi)核編譯步驟(支持S3C2440)
1. 修改Makefile文件：
修改arch宏定義：ARCH?=arm (line176)
修改CROSS_COMPILE為CROSS_COMPILE？=arm-linux- (line177)
2．執(zhí)行命令cp arch/arm/configs/smdk2410_defconfig .config，完成對smdk2410配置信息的拷貝。執(zhí)行命令make menuconfig命令，實現(xiàn)對.config文件的配置信息的設(shè)置。
3. 對.config配置方法如下：
a.進(jìn)入配置System Type --->項：
選擇S3C24XX Implementations --->項，進(jìn)入后選定SMDK2440項和其子項SMDK2440 with S3C2440 CPU module，推出到上級菜單，選定arm900T支持項Support ARM920T processor，至此完成對System Type項的設(shè)置。
b.進(jìn)入配置Floating point emulation --->項：
進(jìn)入后選定NWFPE math emulation和其子項Support extended precision，至此完成對Floating point emulation項的設(shè)置。
c.進(jìn)入配置Device Drivers --->驅(qū)動項：
1)配置Memory Technology Devices (MTD) --->項，進(jìn)入選定Memory Technology Device (MTD) support項和MTD partitioning support項，并進(jìn)入配置NAND Flash Device Drivers --->項，進(jìn)入后選定NAND Flash support for S3C2410/S3C2440 SoC項NAND Flash support for S3C2410/S3C2440 SoC和其子項S3C2410 NAND driver debug項，退出到Device Drivers二級菜單。
2)配置Block devices --->項，進(jìn)入后選定Loopback device support項，修改Default RAM disk size (kbytes)項的值為65535，退到上級菜單
3)配置Network device support --->項，進(jìn)入之后選定Network device support項，進(jìn)入Ethernet (10 or 100Mbit) --->項選擇網(wǎng)DM9000支持項DM9000 support，退出到Device Drivers二級菜單
4)進(jìn)入Character devices --->項的子項Serial drivers --->檢查是否選定Samsung S3C2410/S3C2440/S3C2442/S3C2412 Serial port support和其子項Support for console on S3C2410 serial port，若未選定，則選定退出到主菜單。
d.配置File systems --->項，進(jìn)入之后選定Ext2 extended attributes項、Ext2 execute in place support、Ext3 journalling file system support項和ROM file system support項，進(jìn)入Network File Systems --->項，選定NFS file system support項，退出到主菜單
e.退出，保存。
4.修改arch/arm/march_s3c2410/目錄下的文件common-smdk.c文件：
將struct mtd_partition smdk_default_nand_part[]修改為：
static struct mtd_partition smdk_default_nand_part[] = {
[0] = {
.name = "Kernel",
.size = SZ_2M,
.offset = 0,
},
[1] = {
.name = "root partition",
.offset = SZ_2M,
.size = (64*SZ_1M-2* SZ_1M),
},
[2] = {
.name = "other2",
.offset = SZ_64M,
.size = (64*SZ_1M),
},
[3] = {
.name = "other3",
.offset = SZ_128M,
.size = (64*SZ_1M),
},
#if 0

[2] = {
.name = "S3C2410 flash partition 2",
.offset = SZ_4M,
.size = SZ_4M,
},
[3] = {
.name = "S3C2410 flash partition 3",
.offset = SZ_8M,
.size = SZ_2M,
},
[4] = {
.name = "S3C2410 flash partition 4",
.offset = SZ_1M * 10,
.size = SZ_4M,
},
[5] = {
.name = "S3C2410 flash partition 5",
.offset = SZ_1M * 14,
.size = SZ_1M * 10,
},
[6] = {
.name = "S3C2410 flash partition 6",
.offset = SZ_1M * 24,
.size = SZ_1M * 24,
},
[7] = {
.name = "S3C2410 flash partition 7",
.offset = SZ_1M * 48,
.size = SZ_16M,
}
#endif
};
5.修改arch/arm/march_s3c2410/目錄下的march-smdk2410.c文件：
修改函數(shù)void __init smdk2440_map_io()：將主頻設(shè)置為12000000。代碼為s3c24xx_init_clocks(12000000);
6.執(zhí)行make clean清除命令，再執(zhí)行make uImage命令，完成make命令之后將在arch/arm/boot目錄下產(chǎn)生uImage文件。至此整個內(nèi)核的修改和編譯全部完成。

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