Framebuffer using system memory

[Alessio Sangalli <alesan@manoweb.com>]

Hi I am working on a framebuffer that uses the system memory.

What I mean here is that I need to pass mem=120M to a system that has
128MB to "reserve" 8MB of memory for the framebuffer; then I program the
hardware to use that region of memory.

The reason I do this is that it seems impossible to kmalloc more that
4MB of contiguos physical memory with the Linux Kernel.

Bottom line, I do not know how to map those 8MB back to userspace. If
userspace opens mmaps /dev/mem and writes to the appropriate location it
can access the fb perfectly.

Any hints? All of this is on ARM9.

Thank you
Alessio


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