Linux 2.6.28

遇到的问题和解决办法：

    问题1，机器ID不对：

U-Boot$ tftp 30008000 zImage

TFTP from server 192.168.7.110; our IP address is 192.168.7.236

Filename 'zImage'.

Load address: 0x30008000

Loading: T #################################################################

         ########################################################

done

Bytes transferred = 1772672 (1b0c80 hex)

U-Boot$ go 30008000

## Starting application at 0x30008000 ...

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

Error: unrecognized/unsupported machine ID (r1 = 0x33f61cc4).

Available machine support:

ID (hex)        NAME

0000016a        SMDK2440

Please check your kernel config and/or bootloader.

    解决：

已经查看了U-Boot的参数，是0x16A，没传错啊：

U-Boot$ bdinfo

arch_number = 0x0000016A

env_t       = 0x00000000

boot_params = 0x30000100

DRAM bank   = 0x00000000

-> start    = 0x30000000

-> size     = 0x04000000

ethaddr     = 00:14:97:0F:AB:AB

ip_addr     = 192.168.7.236

baudrate    = 115200 bps

修改，增加ID代码：

"arch/arm/kernel/head.S"

ENTRY(stext)

   /********* ABING add here *********/

   mov    r0, #0

   @mov    r1, #0x16A

   mov    r1, #0x160

   add    r1, r1, #0x0A

   ldr    r2, =0x30000100

   /********* end add *********/

        msr     cpsr_c, #PSR_F_BIT | PSR_I_BIT | SVC_MODE @ ensure svc mode

    问题2：zImage出现乱码

      解决：修改系统时钟为12M解决。

    问题3：uImage出现复位死机

TFTP from server 192.168.7.110; our IP address is 192.168.7.236

Filename 'uImage'.

Load address: 0x30008000

Loading: T #################################################################

         ##############################################

done

Bytes transferred = 1617072 (18acb0 hex)

## Booting kernel from Legacy Image at 30008000 ...

   Image Name:   Linux-2.6.28

   Created:      2009-03-04  22:56:35 UTC

   Image Type:   ARM Linux Kernel Image (uncompressed)

   Data Size:    1617008 Bytes =  1.5 MB

   Load Address: 30008000

   Entry Point:  30008000

   Verifying Checksum ... OK

   XIP Kernel Image ... OK

OK

Starting kernel ...

data abort

pc : [<3000800c>]          lr : [<33fa434c>]

sp : 33f4fca4  ip : 33f4fcb4     fp : 33fbdf70

r10: 0000016a  r9 : fff302c1     r8 : 33f4ffdc

r7 : 33f4ffb8  r6 : 33fd3200     r5 : 33f51a6d  r4 : 00000000

r3 : 30008000  r2 : 30000100     r1 : 0000016a  r0 : ea000012

Flags: nZCv  IRQs off  FIQs off  Mode SVC_32

Resetting CPU ...

tftp 31000000 uImage; bootm"

U-Boot$ saveenv

Saving Environment to Flash...

Un-Protected 1 sectors

是tftp加载命令的问题，不能加载在0x30008000处，改为0x31000000就可以了。

setenv bootcmd "tftp 31000000 uImage; bootm"

S3C2440头文件位置：

和以前的有很大变化了，已经移到arch/arm/mach-s3c2410/include/mach/目录下了，

在程序中包含改为：#include

即可。

S3C2440GPIO操作范例：

GPIO操作函数实现的文件：

arch/arm/plat-s3c24xx/gpio.c

void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int function)

unsigned int s3c2410_gpio_getcfg(unsigned int pin)

void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)

int s3c2410_gpio_getpull(unsigned int pin)

void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)

unsigned int s3c2410_gpio_getpin(unsigned int pin)

unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)

int s3c2410_gpio_getirq(unsigned int pin)

int s3c2410_gpio_irq2pin(unsigned int irq)

./arch/arm/mach-s3c2440/mach-nexcoder.c:        s3c2410_gpio_setpin(S3C2410_GPF2, 0);

./arch/arm/mach-s3c2440/mach-nexcoder.c:        s3c2410_gpio_cfgpin(S3C2410_GPF2, S3C2410_GPF2_OUTP); // CAM_GPIO6 => CAM_PWRDN

./arch/arm/mach-s3c2440/mach-osiris.c:  s3c2410_gpio_setpin(S3C2410_GPA21, 1);

./arch/arm/mach-s3c2440/mach-osiris.c:  s3c2410_gpio_cfgpin(S3C2410_GPA21, S3C2410_GPA21_OUT);

./arch/arm/mach-s3c2440/mach-osiris.c:  s3c2410_gpio_cfgpin(S3C2410_GPA21, S3C2410_GPA21_nRSTOUT);

./arch/arm/mach-s3c2440/mach-osiris.c:          s3c2410_gpio_setpin(S3C2410_GPA0, 1);

./arch/arm/mach-s3c2442/Kconfig:        select S3C2410_GPIO

./arch/arm/plat-s3c24xx/common-smdk.c:  .gpio           = S3C2410_GPF4,

./arch/arm/plat-s3c24xx/common-smdk.c:  .gpio           = S3C2410_GPF5,

./arch/arm/plat-s3c24xx/common-smdk.c:  .gpio           = S3C2410_GPF6,

./arch/arm/plat-s3c24xx/common-smdk.c:  .gpio           = S3C2410_GPF7,

./arch/arm/plat-s3c24xx/common-smdk.c:  s3c2410_gpio_cfgpin(S3C2410_GPF4, S3C2410_GPF4_OUTP);

./arch/arm/plat-s3c24xx/common-smdk.c:  s3c2410_gpio_cfgpin(S3C2410_GPF5, S3C2410_GPF5_OUTP);

./arch/arm/plat-s3c24xx/common-smdk.c:  s3c2410_gpio_cfgpin(S3C2410_GPF6, S3C2410_GPF6_OUTP);

./arch/arm/plat-s3c24xx/common-smdk.c:  s3c2410_gpio_cfgpin(S3C2410_GPF7, S3C2410_GPF7_OUTP);

./arch/arm/plat-s3c24xx/common-smdk.c:  s3c2410_gpio_setpin(S3C2410_GPF4, 1);

./arch/arm/plat-s3c24xx/common-smdk.c:  s3c2410_gpio_setpin(S3C2410_GPF5, 1);

./arch/arm/plat-s3c24xx/common-smdk.c:  s3c2410_gpio_setpin(S3C2410_GPF6, 1);

./arch/arm/plat-s3c24xx/common-smdk.c:  s3c2410_gpio_setpin(S3C2410_GPF7, 1);

中断设置变化

#include

        set_irq_handler(IRQ_EINT0, handle_edge_irq);  /* NET_INT*/

        set_irq_type(IRQ_EINT0, IRQ_TYPE_EDGE_FALLING);    /* NET_INT, AX88796B,LOW */

AX88796B网卡驱动

经过复杂的修改之后，能够注册并且能够使用IP-Config进行配置了，NFS提示正确信息。但是无法NFS挂载，而且无法ping通开发板。ping的时候没有进入中断，后来怀疑是中断设置的问题，于是在ax_init函数中增加了中断设置：

        writeb (0x20, ax_base + EN0_BTCR); //Low level INT , pull-up

然后就可以了。

YAFFS2文件系统

[root@localhost yaffs2]# ./patch-ker.sh c ../linux-2.6.28

Updating ../linux-2.6.28/fs/Kconfig

Updating ../linux-2.6.28/fs/Makefile

[root@localhost yaffs2]#

kill_proc

./drivers/staging/slicoss/slicoss.c:                    status = kill_proc(card->dump_task_id->pid, SIGKILL, 1);

OProfile支持

如果希望使用oprofile等工具对应用程序进行分析，需要在内核中使能oprofile选项，一般在gerneral设置栏中。