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2009-10-09 21:21:09

USB和SD/MMC移植V1.2 

USBSD/MMC移植笔记

 

一、USB移植

在移植好内核和跟文件系统的基础上,进行USB的移植。

S3C2440集成了USB控制器支持USB1.1版本,支持USB主机和USB设备主机符合OHCI1.0版本,Linux2.6.29.1的内核支持USB控制器,只需在内核中配置即可。

在内核目录下,输入make menuconfig,进入配置菜单,如下:

Device Drivers-à

       SCSI device support-à

                     <*>SCSI device support

                     [*]legacy /proc/scsi/ support

<*>SCSI disk support

<*>SCSI CDROM support

       [*]HID Devices-à

                     <*> USB Human Interface Device(full HID)support

                     [*]   /dev/hiddev raw HID device support

       [*]USB support-à

                     <*> support for Host-side USB

                     [*] USB device filesystem

                     [*] USB device class-devices(DEPRECATED)

                     <*>OHCI HCD support

                     <*>USB Mass storage support

先用make clean命令清除编译内核的垃圾文件,然后用命令make zImage编译内核。

在移植的根文件系统系统目录dev下建立如下的设备文件:

mknod sda1 b 8 1

把编译好的内核和根文件系统映像文件下载到开发板,启动开发板后插入U盘,终端出现如下信息:

[@MrFeng=W]#ls

bin         etc         linuxrc     proc        sys         var

boot        home        lost+found  root        tmp         www

dev         lib         mnt         sbin        usr

[@MrFeng=W]#usb 1-1: new full speed USB device using s3c2410-ohci and address 2

usb 1-1: New USB device found, idVendor="0204", idProduct="6025"

usb 1-1: New USB device strings: Mfr="0", Product="0", SerialNumber="0"

usb 1-1: configuration #1 chosen from 1 choice

scsi0 : SCSI emulation for USB Mass Storage devices

scsi 0:0:0:0: Direct-Access     USB A    Flash Disk       2.00 PQ: 0 ANSI: 2

sd 0:0:0:0: [sda] 506420 512-byte hardware sectors: (259 MB/247 MiB)

sd 0:0:0:0: [sda] Write Protect is off

sd 0:0:0:0: [sda] Assuming drive cache: write through

sd 0:0:0:0: [sda] 506420 512-byte hardware sectors: (259 MB/247 MiB)

sd 0:0:0:0: [sda] Write Protect is off

sd 0:0:0:0: [sda] Assuming drive cache: write through

 sda: sda1

sd 0:0:0:0: [sda] Attached SCSI removable disk

 

[@MrFeng=W]#mount -t vfat /dev/sda1 /mnt/usb

FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!

使用命令mount挂载U盘:

[@MrFeng=W]#mount -t vfat /dev/sda1 /mnt/usb 

[@MrFeng=W]#ls /mnt/usb

bootloader.tgz         logomaker.tgz          rootfs.img

busybox-1.13.3.tar.gz  mdev.txt               server.c

examples(1).tgz        mini2440_pwm.c         zImage

getaddrinfo.c          mkyaffsimage.tgz

led_driver.c           root_qtopia.img

 

拔下U盘后出现:

[@MrFeng=W]#usb 1-1: USB disconnect, address 2

 

二、SD/MMC移植

S3C2440集成了一个MMC/SD/SDIO主机控制器,用于访问外接的SDMMCSDIO卡,linux-2.6.29.1包含了MMC/SD驱动程序,只需在内核中配置即可。在内核里做如下配置:

Device Drivers-?

       <*>MMC/SD/SDIO card support--->

              <*>MMC block device driver

              [*]Use bounce buffer for simple hosts

              <*>Samsung S3C SD/MMC Card Interface support

配置好后,把编译的内核下载到开发板后,插入SD卡终端没有任何提示。细细一看,友善之臂的SD卡的写保护不是直接接地的,二是接到GPH8引脚的,

于是我在内核文件/arch/arm/mach-s3c2440/mach-smdk2440.c中做如下修改:

static void __init smdk2440_machine_init(void)

{

       s3c24xx_fb_set_platdata(&smdk2440_fb_info);

       s3c_i2c0_set_platdata(NULL);

       //开启LCD背光

       s3c2410_gpio_cfgpin(S3C2410_GPG4,S3C2410_GPG4_OUTP);

    s3c2410_gpio_setpin(S3C2410_GPG4,1);

       //关闭SD卡写保护

       s3c2410_gpio_cfgpin(S3C2410_GPH8,S3C2410_GPH8_OUTP);

       s3c2410_gpio_setpin(S3C2410_GPH8,0);

       platform_add_devices(smdk2440_devices, ARRAY_SIZE(smdk2440_devices));

       smdk_machine_init();

}

另外,将检测SD卡的引脚设为中断,用于检测SD卡,在内核文件在drivers/mmc/host/s3cmci.c1335行添加如下代码:

host->irq_cd = IRQ_EINT16;

s3c2410_gpio_cfgpin(S3C2410_GPG8,S3C2410_GPG8_EINT16);

1357行注释掉如下代码:

//ret = -EBUSY;

//goto probe_free_irq_cd;

 

重新编译内核,下载到开发板,并在跟文件系统的dev目录下通过命令“mknod mmcblk0 b 179 0”建立节点,烧写根文件系统。系统启动后将SD卡插入到卡座,在终端出现如下信息:

[@MrFeng=W]#mmc0: card 0002 removed

s3c2440-sdi s3c2440-sdi: powered down.

s3c2440-sdi s3c2440-sdi: running at 0kHz (requested: 0kHz).

s3c2440-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).

s3c2440-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).

s3c2440-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).

s3c2440-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).

s3c2440-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).

s3c2440-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).

s3c2440-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).

s3c2440-sdi s3c2440-sdi: running at 16875kHz (requested: 25000kHz).

s3c2440-sdi s3c2440-sdi: running at 16875kHz (requested: 25000kHz).

mmc0: new SD card at address 0002

mmcblk0: mmc0:0002 00000 1.90 GiB

 mmcblk0:<4>mmcblk0: retrying using single block read

 

拔下SD卡出现:

[@MrFeng=W]#mmc0: card 0002 removed

s3c2440-sdi s3c2440-sdi: powered down.

 

说明:V1.2是对V1.1SD卡移植部分进行修改,V1.1中移植SD卡是不完善的,只关闭了SD卡写保护,没有添加检测SD卡部分,这将导致使用不正常。

 

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