Hello Wolfgang
Am 03.12.2010 15:47, schrieb Wolfgang Denk:
Has anyone an explanation for this behavior? Is anyone out there having dcache running on an ARM926 and working usb/tftpboot?
Many drivers have not been written to work with enabled caches.
What is the reason that special handling is needed when dcache is enabled? If a driver doesn't use any DMA there should be no need as the dcache is only enabled for the RAM and not for any memory mapped IO if I understand the code in arch/arm/lib/cache-cp15.c right.
As far as USB is concerned, you might be lucky that your system usies a EHCI controller, so setting CONFIG_EHCI_DCACHE should help.
No, only OHCI.
As for the network driver, you will probably have to figure out yourself how to fix that.
As the memory mapped network controller (SMSC9221) is not cached it shouldn't be a problem or do I miss something here?
Patches welcome.
If someone can give me a little push into the right direction I will try but currently I have no idea what to do besides activating the cache right before the default "bootm" booting.
Thanks a lot Matthias