Hi Ryan,
you are probably using the CONFIG_USB_OHCI_NEW option for your PCI OHCI controller. The code in drivers/usb/usb_ohci.c is currently not aware of caches. So we need to add some flush/invalidates at the correct places.
I think nobody will keep you from starting to work on this :-)
Matthias
On Thursday 15 May 2008 06:33:07 Ryan CHEN wrote:
Hi all, I am porting U-Boot to a MIPS64 platform, that uses USB host controller NEC uPD720101 on PCI bus.
I didn't modify anything related with USB driver, I just enabled OHCI in the configuration. When CPU cache is disabled, USB is perfect working. When CPU cache is enabled, every driver works well but not USB.
Could you suggest me how to solve the problem? Is there any specific part of USB driver that requires cache handling?
Best Regards, Ryan Chen