移植最新uboot的总结

s3c2440_hwcontrol

chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);

*maf_id = chip->read_byte(mtd);

*dev_id = chip->read_byte(mtd);

3.8 修改UBOOT支持DM9000网卡

eth_initialize

board_eth_init

cs8900_initialize

*** ERROR: `ethaddr not set

set ipaddr 192.168.1.17

set ethaddr 00:0c:29:4d:e4:f4

set serverip 192.168.1.3

4. 易用性修裁剪及制作补丁

内核打印出来的分区信息

0x00000000-0x00040000 : "bootloader"

0x00040000-0x00060000 : "params"

0x00060000-0x00260000 : "kernel"

0x00260000-0x10000000 : "root"

nand erase 60000 200000

nand write 30000000 60000 200000

tftp 30000000 uImage

nand erase.part kernel

nand write 30000000 kernel

烧写JFFS2

tftp 30000000 fs_mini_mdev.jffs2

nand erase.part rootfs

nand write.jffs2 30000000 0x00260000 5b89a8

set bootargs console=ttySAC0,115200 root=/dev/mtdblock3 rootfstype=jffs2

烧写YAFFS

tftp 30000000 fs_mini_mdev.yaffs2

nand erase.part rootfs

nand write.yaffs 30000000 260000 889bc0

更新UBOOT:

tftp 30000000 u-boot_new.bin; protect off all; erase 0 3ffff; cp.b 30000000 0 40000

制作补丁：

diff -urN u-boot-2012.04.01 u-boot-2012.04.01_100ask > u-boot-2012.04.01_100ask.patch

分析"重定位之修改代码为新地址":

#ifndef CONFIG_SPL_BUILD

ldr r0, _TEXT_BASE

// r0=0, 代码基地址

sub r9, r6, r0

// r9 = r6-r0 = 0x33f41000 - 0 = 0x33f41000

ldr r10, _dynsym_start_ofs

// r10 = 00073608

add r10, r10, r0

// r10 = 00073608 + 0 = 00073608

ldr r2, _rel_dyn_start_ofs

// r2=0006b568

add r2, r2, r0

// r2=r2+r0=0006b568

ldr r3, _rel_dyn_end_ofs

// r3=00073608

add r3, r3, r0

// r3=r3+r0=00073608

fixloop:

ldr r0, [r2]

1. r0=[0006b568]=00000020

add r0, r0, r9

1. r0=r0+r9=00000020 + 0x33f41000 = 0x33f41020

ldr r1, [r2, #4]

1. r1=[0006b568+4]=00000017

and r7, r1, #0xff

1. r7=r1&0xff=00000017

cmp r7, #23

1. r7 == 23(0x17)

beq fixrel

cmp r7, #2

beq fixabs

b fixnext

fixabs:

mov r1, r1, LSR #4

add r1, r10, r1

ldr r1, [r1, #4]

add r1, r1, r9

b fixnext

fixrel:

ldr r1, [r0]

1. r1=[00000020]=000001e0

add r1, r1, r9

1. r1=r1+r9=000001e0 + 0x33f41000 = 33F411E0

fixnext:

str r1, [r0]

1. [0x33f41020] = 33F411E0

add r2, r2, #8

1. r2=r2+8=0006b568+8=6B570

cmp r2, r3

1.

blo fixloop

#endif