On Thursday 21 October 2010 12:34:01 Albert ARIBAUD wrote: > > But with DCACHE ON, the USB Stick is not found - maybe a timing problem: > > > > TOP9000> dc off > > Data (writethrough) Cache is OFF > > TOP9000> usb reset > > (Re)start USB... > > USB: scanning bus for devices... 2 USB Device(s) found > > > > scanning bus for storage devices... 1 Storage Device(s) found > > > > TOP9000> dc on > > Data (writethrough) Cache is ON > > TOP9000> usb reset > > (Re)start USB... > > USB: scanning bus for devices... ERROR: CTL:TIMEOUT > > 2 USB Device(s) found > > > > scanning bus for storage devices... 0 Storage Device(s) found > > > > TOP9000> > > > > > > Reinhard > > If the USB controller uses DMA, then the DCache issue probably has to do > with making sure to flush the (relevant lines of) cache before > memory-to-device DMAs and to invalidate the (again, relevant lines of) > cache after device-to-memory DMAs.
Correct. Note that the EHCI driver already supports such a mode with d-cache enabled. You need to set CONFIG_EHCI_DCACHE to enable these cache handling functions. > And I suggest we move this dcache issue to its own discussion thread. Yes. This should be analysed/handled independently. Cheers, Stefan -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: off...@denx.de _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
