Messages in this thread | | | Date | Tue, 3 Jul 2001 11:51:18 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: Memory access |
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Em Tue, Jul 03, 2001 at 04:45:32PM +0200, Guillaume Lancelin escreveu: > 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!)
are you accessing it directly? read Documentation/IO-mapping.txt
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