接上。。。
7.修改晶振頻率( 可解決打印信息亂碼問題 )
文件:arch/arm/mach-s3c2440/mach-smdk2440.c
/*s3c24xx_init_clocks(16934400);*/ s3c24xx_init_clocks(12000000);
8.修改MTD分區
文件: arch/arm/plat-s3c24xx/common-smdk.c
需要和bootloader中的分區信息相同(128M),否則,啓動時出錯。
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 = 0x03c00000, //30M
.offset = 0x00800000,
},
[4] = {
.name = "WINCE",
.size = 0x03c00000,
.offset = 0x04400000,
}
};
這裏現在還是有些問題,網上有人說fs_yaffs必須爲【3】否則啓動出現亂碼,這裏主要是nand的分區。後面詳述。
9.關閉ECC校驗
文件:drivers/mtd/nand/s3c2410.c
函數:s3c2410_nand_init_chip
/*chip->ecc.mode = NAND_ECC_SOFT; */ chip->ecc.mode = NAND_ECC_NONE;
10.修改nandflash驅動,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, // 原數值爲2,支持2K每頁的flash修改爲1。K9F1G08,K9F2G08是2k每頁的flash
.pattern = scan_ff_pattern
};
static struct nand_bbt_descr largepage_flashbased = {
.options = NAND_BBT_SCAN2NDPAGE,
.offs = 0,
.len = 1, //原數值爲2,支持2K每頁的flash修改爲1。K9F1G08,K9F2G08是2k每頁的flash
.pattern = scan_ff_pattern
};
11.下面,開始配置內核。
進入linux-2.6.33目錄,把s3c2410的默認配置寫入config文件。
make s3c2410_defconfig
配置文件系統選項
配置yaffs2文件系統
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相關選項
修改配置如下:
System Type --->
S3C2440 Machines --->
[*] SMDK2440
[*] SMDK2440 with S3C2440 CPU module
注:以上幾步都是照着做下來都沒什麼問題,但是後來編譯內核生成zImage時有2.4M開始一位kernel區只有2M(後來知道是3M),爲了減小內核將無關的文件系統選項都去掉了,但是編譯出的zImage還是沒有減少,按道理說是應該減少的。
11.接下來是配置各種設備的驅動
移植USB host驅動
在這個版本的linux內核,已經對USB驅動進行來很好的支持,僅僅需要修改配置。
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
目前2.6.28.7版本的根文件系統的設備管理器是靜態生成節點的,所以需要添加節點。
開發板啓動以後,在/dev目錄下輸入一下命令:
mknod sda1 b 8 1
這個命令中的sda1是設備節點名
(生成節點,之前理解的掛載usb設備可能有些偏差,看來PC機下的linux命令還是不能完全照搬照用的)
12.移植RTC驅動
在這個版本的linux內核,已經對RTC驅動進行來很好的支持,不需要修改配置。相應配置如下
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
然後添加對設備的支持
打開arch/arm/mach-s3c2440/mach-smdk2440.c
static struct platform_device *smdk2440_devices[] __initdata = {
&s3c_device_usb,
&s3c_device_lcd,
&s3c_device_wdt,
&s3c_device_i2c0,
&s3c_device_iis,
&s3c_device_rtc,
};
設備支持就是在mach-smdk2440.c下面給結構體platform_device *smdk2440_devices[] __initdata添加設備名。
13.移植UDA1341驅動
在平臺上添加和配置UDA1341:
修改arch/arm/mach-s3c2440/mach-smdk2440.c
在開始添加頭文件
#include <sound/s3c24xx_uda134x.h>
#include <mach/gpio-fns.h>
添加設備配置
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,
}
};
14.移植DM9000驅動
修改 drivers/net/dm9000.c 文件:
頭文件增加:
#include <mach/regs-gpio.h>
#include <mach/irqs.h>
#include <mach/hardware.h>
在dm9000_probe 函數開始增加:
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);
在這個函數的最後需要修改:
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];
}
修改arch/arm/mach-s3c2440/mach-smdk2440.c,添加設備
修改 arch/arm/plat-s3c24xx/devs.c
添加頭文件#include <linux/dm9000.h>
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);
修改 arch/arm/plat-s3c/include/plat/devs.h 45行附近,添加
extern struct platform_device s3c_device_dm9000;
修改arch/arm/mach-s3c2410/include/mach/map.h 文件
/* DM9000 */
#define S3C24XX_PA_DM9000 0x20000300
#define S3C24XX_VA_DM9000 0xE0000000
14. 3.5寸LCD顯示的移植
這個我是直接從以前2.6.28版本中的arch/arm/mach-s3c2440/mach-smdk2440.c弄過來的。