From owner-freebsd-hackers  Tue Jan 16 14:29:34 2001
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Date: Tue, 16 Jan 2001 16:29:14 -0600 (CST)
From: John Gregor <johng@vieo.com>
Message-Id: <200101162229.f0GMTEH54921@vieo.com>
To: freebsd-hackers@FreeBSD.ORG
Subject: SIGBUS when writing to mmap'd device memory...
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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


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