Memory access

[Guillaume Lancelin]

Writing a device driver for a IO card, I have the following message from
the kernel:
Unable to handle kernel paging request at virtual address 000d0804.
[then it gives the register values]
Segmentation fault."

This address (0xd0804) is the location of a "mailbox" reserved by the IO
card, and from which commands are passed to the card.

My question: is the kernel using or protecting this area of the memory,
and is there a way to deprotect it??? (how dangerous!)

Thanks
Guillaume

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