USB OHCI issue

Hi everybody,

I am currently playing around with U-Boot's (PCI) OHCI driver on a 405 board. U-Boot's USB stuff is running fine on this board. I can read files from an USB stick without any problems.

But when I start Linux with a (rather old) 2.4.21 kernel, the still connected USB stick is not detected as storage device. I have two ways to get USB working under this Linux kernel:

a) I do not start the USB subsystem at the U-Boot prompt ('usb start')
b) I disconnect and reconnect the USB stick when Linux is running.

Both options are not really what I want. Calling 'usb stop' before booting Linux does not help.

I am not sure if this is a Linux or U-Boot issue. Perhaps a newer kernel does not show this issue, but upgrading is currently not an option:-)

Can anybody verify this behavior with other 2.4.x kernels?

Regards
Matthias

Hi Matthias,

So maybe USB does not get stopped completely when "usb stop" is issued. Are you using the generic USB driver (CONFIG_USB_OHCI_NEW) ? Maybe you need some board dependant code to correctly stop USB?

So the kernel doesn't get notified of the already plugged device if it has been started under U-Boot. I suppose this supports the theory of "usb stop" not working.

I would try to find why :-)

Best regards

Markus Klotzbuecher

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