========================================================================!! 任务一: !!
!! 任务描述:完成在linux2.6.22下的usb驱动的移植,实现usb主设备驱动,并写出总结文档 !!
========================================================================2007.11.161.在kernel启动是出现如下问题:
mount: mounting tmpfs on /dev failed
解决方案如下,
File systems --->
Pseudo filesystems --->
[*] Virtual memory file system support (former shm fs)
2.另附上vivi启动参数,最近一直用nfs,转换着麻烦,先记下来cp
设置从flash 启动:
param set linux_cmd_line "noinitrd init=/linuxrc console=ttySAC0 root=/dev/mtdblock3"
设置从nfs启动:
param set linux_cmd_line "noinitrd init=/linuxrc console=ttySAC0 root=/dev/nfs nfsroot=192.192.192.xx:/srv/nfs/rootfs ip=192.192.192.200:192.192.192.xx:192.192.192.xx:255.255.255.0::eth0:off"
设置从ramdisk启动:
param set linux_cmd_line "console=ttySAC0 initrd=0x30800000,0x400000 root=/dev/ram"。
3.测试通过了usb device的测试,可以进行从设备操作,对usb device进行模块加载操作,方法如下:(两个.ko文件为usb驱动的模块文件,需要加载后使用)
$ insmod s3c2410_udc.ko
$ insmod g_file_storage.ko file=/dev/mtdblock5 stall=0 removable=1
4、usb从部分添加内容:
4.1.usb初始化为从设备时配置:
+++ linux-2.6.22/arch/arm/mach-s3c2410/mach-f2410.c 2007-11-15
&s3c_device_i2c,
&s3c_device_iis,
&s3c_device_nand,
+/* add by feng */
+ &s3c_device_usbgadget,
};
/* USB */
s3c_device_usb.dev.platform_data = &usb_s3c2410_info;
s3c2410_modify_misccr(S3C2410_MISCCR_USBSUSPND0 |
- S3C2410_MISCCR_USBSUSPND1, 0x8);
+ S3C2410_MISCCR_USBSUSPND1 |
+ S3C2410_MISCCR_USBHOST, 0x0);
4.2.添加udc驱动:
+++ linux-2.6.22/drivers/usb/gadget/s3c2410-udc.c 2007-11-15 17:38:17.000000000 +0800
+++ linux-2.6.22/drivers/usb/gadget/s3c2410-udc.h 2007-11-15 17:38:31.000000000 +0800
+++ linux-2.6.22/include/asm/arch-s3c2410/regs-udc.h 2007-11-16 01:22:25.000000000 +0800
4.3.在kconfig中添加udc选项支持:
+++ linux-2.6.22/drivers/usb/gadget/Kconfig 2007-11-15
Select this only if your OMAP board has a Mini-AB connector.
+# add by feng
+config USB_GADGET_S3C2410
+ boolean "S3C2410"
+ depends on ARCH_S3C2410
+ help
+ Samsung's S3C2410 is an ARM-4 processor with an integrated
+ full speed USB 1.1 device controller.
+ It has 4 configurable endpoints, as well as endpoint
+ zero (for control transfers).
+
+config USB_S3C2410
+ tristate
+ depends on USB_GADGET_S3C2410
+ default USB_GADGET
+ select USB_GADGET_SELECTED
+
+config USB_S3C2410_DEBUG
+ boolean "S3C2410 udc debug messages"
+ depends on USB_GADGET_S3C2410
+#end add
+
config USB_GADGET_AT91
boolean "AT91 USB Device Port"
4.4.在makefile中添加udc选项支持:
+++ linux-2.6.22/drivers/usb/gadget/Makefile 2007-11-15 17:01:04.000000000 +0800
obj-$(CONFIG_USB_FSL_USB2) += fsl_usb2_udc.o
+#add by feng
+obj-$(CONFIG_USB_S3C2410) += s3c2410-udc.o
2007.11.15一、学习ctags查找源码的用法,超级方便
步骤:
1,现在源码目录中运行指令
$ ctags –R * ($ 为Linux系统Shell提示符)
2,用vi进入编辑环境,
Ctrl + ]查找查询
Ctrl + T返回上一步
:ta XX 查找文件XX
二、usb从部分(以后添加)
1,添加udc驱动:
在kconfig中添加udc支持:
在makefile中添加udc支持:
2.配置
Device Drivers --->
USB Gadget Support --->
Support for USB Gadgets
USB Peripheral Controller (S3C2410) --->
(X) S3C2410
File-backed Storage Gadget
2007.11.14参考luofuchong的帖子,修改文件,并修改mach-f2410.c文件,使其支持usb的初始化
在mach-f2410.c添加如下:
#include #include #include #include #include /* USB */static struct s3c2410_hcd_info usb_s3c2410_info = { .port[0] = { .flags = S3C_HCDFLG_USED }, .port[1] = { .flags = S3C_HCDFLG_USED }}; int __init s3c2410_init_usb(void){ unsigned long upllvalue; printk("USB Control, (c) 2006 pc104\n"); s3c_device_usb.dev.platform_data = &usb_s3c2410_info; s3c2410_modify_misccr(S3C2410_MISCCR_USBSUSPND0 | S3C2410_MISCCR_USBSUSPND1, 0x8); upllvalue = (0x78<<12)|(0x02<<4)|(0x03); while(upllvalue!=__raw_readl(S3C2410_UPLLCON)) { __raw_writel(upllvalue,S3C2410_UPLLCON); mdelay(1); } return 0;}static void __init f2410_init_machine(void)
{
s3c_device_nand.dev.platform_data = &sbc2410x_nand_info;
platform_add_devices(f2410_devices, ARRAY_SIZE(f2410_devices));
s3c2410_init_usb();}
下面为配置:
下面为拷贝luofuchong的
linux-2.6.14下USB驱动移植心得,主要根据2.6.22的核改了一下,使其可以支持u盘。
/*****************************************from luofuchong**********************************/1、让内核支持热插拔 │ General setup ---> [*] Configure standard kernel features (for small systems) ---> [*] Support for hot-pluggable devices (NEW) 2.USB驱动设置Device Drivers ---> Generic Driver Options ---> <*> Userspace firmware loading supportBlock devices ---> <*> Low Performance USB Block driver SCSI device support ---> <*> SCSI generic support [*] Probe all LUNs on each SCSI device USB support ---> <*> Support for Host-side USB [*] USB device filesystem <*> OHCI HCD support <*> USB Mass Storage support [*] USB Monitor 3、加入了MSDOS fs和VFAT fs的支持。File systems ---> DOS/FAT/NT Filesystems ---> <*> MSDOS fs support <*> VFAT (Windows-95) fs support (936) Default codepage for FAT (cp936) Default iocharset for FAT File systems ---> Partition Types ---> [*] PC BIOS (MSDOS partition tables) support 4. 加入中文字体库(可惜在我的板上还是没能正常显示中文~_~,知道的朋友麻烦告诉我一声,大家一起探讨) Native Language Support ---> <*> Simplified Chinese charset (CP936, GB2312) <*> NLS UTF8 5、另外,如果想让内核把它当成SCSI设备来处理的话,只要把上面:Device Drivers ---> Block devices ---> <*> Low Performance USB Block driver的 Low Performance USB Block driver这个选项去掉,然后把: Device Drivers ---> SCSI device support ---> <*>SCSI disk support的SCSI disk support这个选项选上,重新编译内核就行。/***************************************end from*********************************************/2007.11.13
查找资料:
linux-2.6.14下USB驱动移植心得
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