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dm365 URB problem

hello :

I want to use dm365 with a usb webcam.
I have two usb webcams and the driver I think is right for them.
Now I load the usb_core and musb_hdrc module from kernel source,
and then load the driver for each other.

But after that, I use the v4l2's example code, I got the following two error messages for each other:

webcam with UVC driver:

the driver load sucessful message
uvcvideo: Found UVC 1.00 device USB 2.0 Camera (0c45:62f1)
usbcore: registered new driver uvcvideo

execute error message
uvcvideo: Failed to submit isoc URB 0 (-90).
VIDIOC_STREAMON error 90, Message too long

webcam with gspca driver:

the driver load sucessful message
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: USB GSPCA cam
era found.(ZC3XX)
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [spca5xx_prob
e:4275] Camera type JPEG
/home/pencil722/獢/DM365/useful/gspcav1-20071224/Vimicro/zc3xx.h: [zc3xx_con
fig:669] Find Sensor HV7131R(c)
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [spca5xx_getc
apability:1249] maxw 640 maxh 480 minw 160 minh 120
usbcore: registered new driver gspca
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: gspca driver
01.00.20 registered

execute error message
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [spca5xx_set_
light_freq:1932] Sensor currently not support light frequency banding filters.
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [gspca_set_is
oc_ep:945] ISO EndPoint found 0x81 AlternateSet 7
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: init isoc: us
b_submit_urb(0) ret -90
/home/pencil722/獢/DM365/useful/gspcav1-20071224/gspca_core.c: [spca5xx_open
:1996]  DEALLOC error on init_Isoc

According the these two messages, I think that there are some problems I need to solve.
One is the URB related problem, the other is ISO related problem.
These two problems I think related to the error message are new to me.
As result, I don't have any idea to solve them.

Can anyone tell me what my problem with the error message?
And How to slove the error message?

regards,

Peter

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