求救s3c2443 linux2.6移植，停在解压缩完kernel

elderelf

我编译出一个kernel 大小1MB
烧到板子smdk2443
processor s3c2443
64MB SDRAM
128MB NAND flash
在解压缩完的时候停住了
下面一堆数字为head.S DEBUG讯息.

讯息如下：

U-Boot 1.1.6 (Feb 12 2010 - 10:47:37) for SMDK2443


CPU:   S3C2443@534MHz
       Fclk = 534MHz, Hclk = 133MHz, Pclk = 66MHz
Board: SMDK2443 Mobile SDRAM
DRAM:    64 MB
NAND:    128 MB
In:      serial
Out:     serial
Err:     serial
Net:     No ethernet found.
Hit any key to stop autoboot:  0

NAND read: device 0 offset 0x100000, size 0x300000
3145728 bytes read: OK

NAND read: device 0 offset 0x400000, size 0x100000
1048576 bytes read: OK
## Booting image at 30008000 ...
   Image Name:   linux-2.6.23
   Created:      2010-03-04   6:45:02 UTC
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1016424 Bytes = 992.6 kB
   Load Address: 30008000
   Entry Point:  30008040
   Verifying Checksum ... OK
   XIP Kernel Image ... OK
## Loading Ramdisk Image at 30800000 ...
   Image Name:   ramdisk
   Created:      2010-03-01   3:59:23 UTC
   Image Type:   ARM Linux RAMDisk Image (uncompressed)
   Data Size:    143486 Bytes = 140.1 kB
   Load Address: 30800000
   Entry Point:  30800000
   Verifying Checksum ... OK

Starting kernel ...

Uncompressing Linux.................................................................... done, booting the kernel.

41129200:0000043C:C000507B
301196E8-3031A0E8>30008000
3031A0E8
30008000: E3A00000 E3A010C1 E59F2108 E321F0D3  EE109F10 EB0000B3 E1B0A005 0A00005C
30008020: EB0000C8 E1B08005 0A00006A EB0000D7  EB000010 E59FD0E8 E28FE000 E28AF010
30008040: E3800002 E3A0501F EE035F10 EE024F10  EA000002 E1A00000 E1A00000 E1A00000
30008060: E1A00000 EE010F10 EE103F10 E1A03003  E1A03003 E1A0F00D E59F409C E1A00004
30008080: E3A03000 E2806901 E4803004 E4803004  E4803004 E4803004 E1300006 1AFFFFF9
300080A0: E59A7008 E1A06A2F E1873A06 E7843106  E2840A03 E5A03000 E59F6060 E2800004
300080C0: E0846926 E1500006 E2833601 94803004  9AFFFFFB E2840A03 E3876203 E5806000
300080E0: E59A700C E5983008 E0840003 E2633901  E3530B02 83A03B02 E0806003 E5983004

上面数字为
processor id(arm920T) ： architecture id(smdk2443) : control reg
decompressed kernel start - decompressed kernel end > kernel execution address
end of kernel
dump 256 bytes at start of kernel

我的板子设定如下：
bootcmd=nand read 30008000 100000 300000; nand read 30800000 400000 100000; bootm 30008000 30800000

bootargs=/dev/ram0 rw initrd=30800000,400000 mem=64M ramdisk=143486 init=/linuxrc console=ttySAC0,115200n8 mtdparts=smdk2443-nand:256K(misc),5M(recovery),6M(Kernel),1MB(Ramdisk),60MB(System),20MB(cache),3MB(userdata),-(unused)

我试过用printk在main.c的start_kernel function，发现没显示出来，就表示没跑起来，接下来要怎DEBUG

T-Bagwell

刚出来的话应该printk不出来，可以试试在刚开始的时候点led或者蜂鸣器

elderelf

可以请教要怎呼叫LED嘛？

elderelf

救命阿...现在情况main.c 里面的start_kernel 用printascii 印出字串，结果没显示
在kernel/head.S 里面的__turn_mmu_on 用printascii 印出字母，也没显示

然后我在compressed/head.S加入印出行数的指令，发现一直卡在clear BSS的地方，它就一直重复，程式码如下：

not_relocated: mov r0, #0
1: kputc #'\n' //印出273
kputc #'2'
kputc #'7'
kputc #'3'

kputc #'\n' //印出r0
kphex r0, 8

kputc #'\n' //印出r2
kphex r2, 8

kputc #'\n' //印出r3
kphex r3, 8

str r0, [r2], #4 @ clear bss
kputc #'\n'
kphex r2, 8

str r0, [r2], #4
kputc #'\n'
kphex r2, 8

str r0, [r2], #4
kputc #'\n'
kphex r2, 8

str r0, [r2], #4
kputc #'\n'
kphex r2, 8

kputc #'2'
kputc #'8'
kputc #'1'
kputc #'\n'

cmp r2, r3
blo 1b //若r2<r3，则跳到前面的TAG 1
bl cache_on

他大概的意思就是，把BSS全部设为0，r0=0，r2=BSS start address，r3=BSS end address，做store的动作，把r0存到r2所指到的位址，做完之后r2 =r2+4，开始将bss里头的值都初始化成0，(cmp r2, r3，blo 1b,) 确认一下是不是到了bss的底部,不到底部的话，jump到(1: kputc #'\ n') 继续做搬移的动作。做完bss初始化jump cache_on (bl cache_on)

印出来讯息如下：

SMDK2443 # go 30008000
## Starting application at 0x30008000 ...

0000000D
30008000
1

175
0000000D
0000000D
2
3000836C
00000000
3
00000000
00000000

273
00000000
0000000D
50004000
0000000D
0000000D
0000000D
0000000D
281

273
00000000
0000000D
50004000
0000000D
0000000D
0000000D
0000000D
281

我发现...它r2好像没加4(就是0000000D)，结果就一直循环...