Hi, I have noticed that the DMA allocation for non-coherent PowerPC architecture is using a hard coded virtual memory address for its memory pool. This address is typically 0xFF100000 (set by CONFIG_CONSISTENT_START) and can conflict with early ioremap in systems that enable HIGHMEM.
Is there any reason why we have to use an arbitrary virtual address ? If the virtual address must be known at compile time, can't we use fixmap ? I also can't figure out why we need to use a virtual address known at compilation time and cannot just allocate pages using get_free_pages and mark them as non cacheable and non swappable. For those of you that want to check it out, the code is in arch/powerpc/lib/dma-noncoherent.c Thanks, Remi _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
