Problems about usb camera driver on NiosII uclinux

Hello everyone:

I've got some problems about usb camera driver on Nios II uclinux recently.I'm using nios2linux-1.4,and the hardware environment is DE2 board. This is some of the uclinux boot information:Linux version 2.6.11-uc0 (aladdin@xjtu-04b3c1ca06) (gcc version 3.4.1 (Altera Nios II 5.1 b73))# 7 Sun Aug 13 22:23:12 2006.

I believe that the usb driver for isp1362 has no problem,because someone has successfully used it on Nios II uclinux(DE2),and he says it works well.The camera driver I use works well on arm.When uclinux boot,the usb device and camera can be recognized:

driver isp1362-hcd, 2006-04-28

datastart=80900080,dataend=80900083,adrstart=80900084,adrend=80900087,irq=4

ISP1362 Host Controller, irq 4

isp1362-hcd isp1362-hcd: new USB bus registered, assigned bus number 1

chipID=3630

isp1362-hcd isp1362-hcd: ISP1362 Memory usage:

isp1362-hcd isp1362-hcd: ISTL: 2 * 256: 512 @ $0000:$0100

isp1362-hcd isp1362-hcd: INTL: 16 * ( 64+8): 1152 @ $0200

isp1362-hcd isp1362-hcd: ATL : 32 * ( 64+8): 2304 @ $0680

isp1362-hcd isp1362-hcd: USED/FREE: 3968 128

hub 1-0:1.0: USB hub found

hub 1-0:1.0: 2 ports detected

Initializing USB Mass Storage driver...

usbcore: registered new driver usb-storage

USB Mass Storage support registered.

usbcore: registered new driver hiddev

usbcore: registered new driver usbhid

/cygdrive/c/altera/kits/nios2_51/bin/eclipse/plugins/com.microtronix.nios2linux.

kernel_1.4.0/linux-2.6.x/drivers/usb/input/hid-core.c: v2.0:USB HID core driver

usbcore: registered new driver spca5xx

/cygdrive/c/altera/kits/nios2_51/bin/eclipse/plugins/com.microtronix.nios2linux.

kernel_1.4.0/linux-2.6.x/drivers/usb/media/spca5xx/spca_core.c: spca5xx driver 0

0.57.06LE registered

usb 1-2: new full speed USB device using isp1362-hcd and address 2

/cygdrive/c/altera/kits/nios2_51/bin/eclipse/plugins/com.microtronix.nios2linux.

kernel_1.4.0/linux-2.6.x/drivers/usb/media/spca5xx/spca_core.c: USB SPCA5XX camera found. Type Vimicro Zc301P 0x301b

The file system is read-only, so I can't create /dev/video0 by mknod. What I do is creating a file named @video0,c,81,0 in /linuxf/target/dev/v4l/(linuxf is the directory of linux filesystem project). I wrote some simple drivers before,and it shown that this method works. The application program for camera works well on arm,so I think there is no problem,but when I execute it,some problems occurs:

/etc/issue www.microtronix.com June 2005

Welcome to Linux on the Nios II

Nios2 login: root

Password:

# cd /bin# server

Isochronous transfers not supported

/cygdrive/c/altera/kits/nios2_51/bin/eclipse/plugins/com.microtronix.nios2linux.

kernel_1.4.0/linux-2.6.x/drivers/usb/media/spca5xx/spca_core.c: init isoc: usb_s

ubmit_urb(0) ret -28

ERROR opening V4L interface

Is there anyone knows how I can solve the problem? Thanks!!!!