Hello Albert, Albert ARIBAUD wrote: > Le 21/10/2010 12:11, Reinhard Meyer a écrit : >> Hello, >> >> observation here: >> >> ICACHE is always ON. No crash with "usb read 21000000 0 1000" >> Sorry that I can't reproduce the problem here, not even with 10000 >> blocks. >> (tried a few dozen times) >> (ARM926EJS - AT91SAM9XE) >> (based on TOT 3ed16071b006dbda65070a4143db74da469f6e30 of 35h ago) >> >> 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.
Yep. I think if you want to use dcache here, you have to activate CONFIG_EHCI_DCACHE and implement the flush_dcache_range(), invalidate_dcache_range(), flush_invalidate() functions for your plattform, if not implemented yet. > And I suggest we move this dcache issue to its own discussion thread. Yep. bye, Heiko -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
