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write into it.

The original OKLinux way to manage the framebuffer memory is to
dma_alloc_coherent this memory, and the device mmap function is
implemented with dma_mmap_writecombine. However in my case, the memory
is already mapped to OKLinux, so I don't want to allocate it.

Does someone have an advice on what Linux kernel function I should use
instead of dma_alloc_coherent / dma_mmap_writecombine?

I think this is a general problem when one wants to implement an OKLinux
driver that uses a memory region defined in the XML, in the case where
the device must offer the mmap operation...

Thanks in advance for your hep,

Stephan.