USB和SD/MMC移植笔记<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
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。
S<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />3C2440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 <*>SCSI disk support <*>SCSI CDROM support <*> USB Human Interface Device(full HID)support <*> support for Host-side USB <*>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SD、MMC、SDIO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 <*>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/mash-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(); } |
重新编译内核,下载到开发板,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. |
总结:在高版本的Linux内核中,已集成了USB和SD卡驱动,所需的只是配置,低版本的内核需要打补丁然后配置。
tengjingshu_112148725 2009-7-29 09:27