3、增加devfs文件管理器的支持
我们所用的文件系统使用的是devfs文件管理器。修改fs/Kconfig，
找到
menu "Pseudo filesystems"
添加如下语句：
config DEVFS_FS
bool "/dev file system support (OBSOLETE)"
default y
config DEVFS_MOUNT
bool "Automatically mount at boot"
default y
depends on DEVFS_FS
帮助理解：Kconfig就是对应着内核的配置菜单。假如要想添加新的驱动到内核的源码中，能够修改Kconfig,
这样就能够选择这个驱动，假如想使这个驱动被编译，要修改Makefile。
4、修改晶振频率(可解决打印信息乱码问题)
文件：arch/arm/mach-s3c2440/mach-smdk2440.c
/*s3c24xx_init_clocks(16934400);*/s3c24xx_init_clocks(12000000);
5、修改MTD分区
static struct mtd_partition smdk_default_nand_part[] = {[0] = {.name= "Boot",.size= 0x00100000,.offset = 0},[1] = {.name= "MyApp",.size= 0x003c0000,.offset = 0x00140000,},[2] = {.name= "Kernel",.size= 0x00300000,.offset = 0x00500000,},[3] = {.name= "fs_yaffs",.size= 0x0f000000, //240M.offset = 0x00800000,},/*[4] = {.name= "WINCE",.size= 0x03c00000,.offset = 0x04400000,}*/};
具体参考http://blog.csdn.net/yming0221/article/details/6566551
6、关闭ECC校验
文件：drivers/mtd/nand/s3c2410.c函数：s3c2410_nand_init_chip
/*chip->ecc.mode = NAND_ECC_SOFT; */chip->ecc.mode = NAND_ECC_NONE;
问题：关于ECC：ECC是“Error Correcting Code”的简写，中文名称是“错误检查和纠正”。ECC是一种能够实现
“错误检查和纠正”的技术，ECC内存就是应用了这种技术的内存，一般多应用在服务器及图形工作站上，这将使整个
电脑系统在工作时更趋于安全稳定。此处为避免容易出错，将ECC关闭。
7、修改nandflash驱动，支持K9F1G08的nandflash
修改drivers/mtd/nand下面的nand_bbt.c文件：
static struct nand_bbt_descr largepage_memorybased = { .options = 0, .offs = 0, .len = 1, // 原数值为2，支持2K每页的flash修改为1。K9F1G08，K9F2G08是2k每页的flash .pattern = scan_ff_pattern};static struct nand_bbt_descr largepage_flashbased = { .options = NAND_BBT_SCAN2NDPAGE, .offs = 0, .len = 1, //原数值为2，支持2K每页的flash修改为1。K9F1G08，K9F2G08是2k每页的flash .pattern = scan_ff_pattern};
8、下面，开始配置内核。
进入linux-2.6.35目录，把s3c2410的默认配置写入config文件。
make s3c2410_defconfig
make menuconfig
配置内核特点使用ARM EABI编译
配置文件系统选项配置yaffs2文件系统修改配置如下：
File systems —>
[*] Miscellaneous filesystems —>
<*> YAFFS2 file system support
-*- 512 byte / page devices
-*- 2048 byte (or larger) / page devices
[*] Autoselect yaffs2 format
[*] Cache short names in RAM
配置cpu相关选项修改配置如下：
System Type —>
S3C2440 Machines —>
[*] SMDK2440
[*] SMDK2440 with S3C2440 CPU module
去掉S3C2400 Machines、S3C2410 Machines、S3C2412 Machines、S3C2442 Machines的所有选项，
否则会报错。如果现在编译内核，下载到开发板中，内核就可以正常启动了.有了雏形，继续移植设备驱动。
这里，内核选项*代表编译至内核，M代表编译为模块。
9、移植USB host驱动
在这个版本的linux内核，已经对USB驱动进行来很好的支持，仅仅需要修改配置。
Device Drivers —>
[*] USB support —>
{*} Support for Host-side USB
[*] USB device filesystem (DEPRECATED)
[*] USB device class-devices (DEPRECATED)
<*> OHCI HCD support
<*> USB Mass Storage support
[*] HID Devices —>
{*} Generic HID support
[*] /dev/hidraw raw HID device support
SCSI device support —>
<*> SCSI device support
[*] legacy /proc/scsi/ support
<*> SCSI disk support
<*> SCSI tape support
10、移植RTC驱动
在这个版本的linux内核，已经对RTC驱动进行来很好的支持，不需要修改配置。相应配置如下
Device Drivers —>
<*> Real Time Clock —>
[*] Set system time from RTC on startup and resume
(rtc0) RTC used to set the system time
[ ] RTC debug support
*** RTC interfaces ***
[*] /sys/class/rtc/rtcN (sysfs)
[*] /proc/driver/rtc (procfs for rtc0)
[*] /dev/rtcN (character devices)
<*> Samsung S3C series SoC RTC
然后添加对设备的支持打开arch/arm/mach-s3c2440/mach-smdk2440.c，添加设备，代码如下：
static struct platform_device *smdk2440_devices[] __initdata = { &s3c_device_ohci, &s3c_device_lcd, &s3c_device_wdt, &s3c_device_i2c0, &s3c_device_iis, &s3c_device_rtc,};
11、移植UDA1341驱动
在平台上添加和配置UDA1341:
修改arch/arm/mach-s3c2440/mach-smdk2440.c，在开始添加头文件
#include <sound/s3c24xx_uda134x.h>
#include <mach/gpio-fns.h>
static struct s3c24xx_uda134x_platform_data s3c24xx_uda134x_data = { .l3_clk = S3C2410_GPB(4), .l3_data = S3C2410_GPB(3), .l3_mode = S3C2410_GPB(2), .model = UDA134X_UDA1341,}; static struct platform_device s3c24xx_uda134x = { .name = "s3c24xx_uda134x", .dev = { .platform_data = &s3c24xx_uda134x_data, }};
把设备添加到平台当中
static struct platform_device *smdk2440_devices[] __initdata = { &s3c_device_ohci, &s3c_device_lcd, &s3c_device_wdt, &s3c_device_i2c0, &s3c_device_iis, &s3c_device_rtc, &s3c24xx_uda134x,};
内核配置如下
Device Drivers —>
<*> Sound card support —>
<*> Advanced Linux Sound Architecture —>
<*> OSS Mixer API
<*> OSS PCM (digital audio) API
[*] OSS PCM (digital audio) API – Include plugin system
[*] Support old ALSA API
[*] Verbose procfs contents
[*] Verbose printk
[*] Generic sound devices —>
<*> ALSA for SoC audio support —>
<*> SoC Audio for the Samsung S3C24XX chips
<*> SoC I2S Audio support UDA134X wired to a S3C24XX
12、移植DM9000驱动
a、修改drivers/net/dm9000.c文件：头文件增加：
#include <mach/regs-gpio.h>
#include <mach/irqs.h>
#include <mach/hardware.h>
在dm9000_probe函数开始增加：
unsigned char ne_def_eth_mac_addr[]={0x00,0x12,0x34,0x56,0x80,0x49}; static void *bwscon; static void *gpfcon; static void *extint0; static void *intmsk; #define BWSCON (0x48000000) #define GPFCON (0x56000050) #define EXTINT0 (0x56000088) #define INTMSK (0x4A000008) bwscon=ioremap_nocache(BWSCON,0x0000004); gpfcon=ioremap_nocache(GPFCON,0x0000004); extint0=ioremap_nocache(EXTINT0,0x0000004); intmsk=ioremap_nocache(INTMSK,0x0000004); writel(readl(bwscon)|0xc0000,bwscon); writel( (readl(gpfcon) & ~(0x3 << 14)) | (0x2 << 14), gpfcon); writel( readl(gpfcon) | (0x1 << 7), gpfcon); // Disable pull-up writel( (readl(extint0) & ~(0xf << 28)) | (0x4 << 28), extint0); //rising edge writel( (readl(intmsk)) & ~0x80, intmsk);
在这个函数的最后需要修改：
if (!is_valid_ether_addr(ndev->dev_addr)) { /* try reading from mac */ mac_src = "chip"; for (i = 0; i < 6; i++) //ndev->dev_addr[i] = ior(db, i+DM9000_PAR); ndev->dev_addr[i] = ne_def_eth_mac_addr[i]; }
b、修改arch/arm/mach-s3c2440/mach-smdk2440.c，添加设备
static struct platform_device *smdk2440_devices[] __initdata = { &s3c_device_ohci, &s3c_device_lcd, &s3c_device_wdt, &s3c_device_i2c0, &s3c_device_iis, &s3c_device_rtc, &s3c24xx_uda134x, &s3c_device_dm9000,};
c、修改arch/arm/plat-s3c24xx/devs.c添加头文件
#include <linux/dm9000.h>
添加以下代码
static struct resource s3c_dm9000_resource[] = { [0] = { .start = S3C24XX_PA_DM9000, .end = S3C24XX_PA_DM9000+ 0x3, .flags = IORESOURCE_MEM }, [1]={ .start = S3C24XX_PA_DM9000 + 0x4, //CMD pin is A2 .end = S3C24XX_PA_DM9000 + 0x4 + 0x7c, .flags = IORESOURCE_MEM }, [2] = { .start = IRQ_EINT7, .end = IRQ_EINT7, .flags = IORESOURCE_IRQ }, }; static struct dm9000_plat_data s3c_device_dm9000_platdata = { .flags= DM9000_PLATF_16BITONLY, }; struct platform_device s3c_device_dm9000 = { .name= "dm9000", .id= 0, .num_resources= ARRAY_SIZE(s3c_dm9000_resource), .resource= s3c_dm9000_resource, .dev= { .platform_data = &s3c_device_dm9000_platdata, } }; EXPORT_SYMBOL(s3c_device_dm9000);
d、修改arch/arm/plat-samsung/include/plat/devs.h 45行附近,添加喜欢真实的人，要做真实的人，所以从来不会想要刻意模仿任何人。
