Better STOPINTR bit semantics in the PXA2xx DMA.
Don't error out on reading GPCR register, just warn (Thorsten Zitterell). Don't zero a memory that's already zeroed. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3676 c046a42c-6fe2-441c-8c8c-71466251a162
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