ppc4xx: Make USB working with CONFIG_4xx_DCACHE defined
This patch disables the 44x d-cache on 'usb start' and reenables it on 'usb stop'. This should be seen as a temporary fix until the generic usb-ohci driver can life with d-cache enabled. Signed-off-by: NMatthias Fuchs <matthias.fuchs@esd-electronics.com> Signed-off-by: NStefan Roese <sr@denx.de>
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