All, I'm trying to mmap() a region of device memory into user space. When the user app tries to write to the page, I'm getting a SIGBUS. My code in foo_mmap() looks essentially like: ... voff = bhandle + client_offset; poff = vtophys(voff); return i386_btop(poff); I know that voff is fine as I can write in the kernel to that address and the right things happen. Any ideas? Anything I can do to help narrow down the cause? Thanks, -JohnG To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message