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From: Hans Petter Selasky <hselasky@c2i.net>
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Cc: freebsd-current@freebsd.org, freebsd-amd64@freebsd.org
Subject: Re: MAXMEM ?
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On Saturday 17 September 2005 08:14, FUJITA Kazutoshi wrote:
> Hi,
>
> I have AMD64 -CURRENT box.
> Motherboard is ASUS A8N-E(chipset is nForce4).
> It has 4GB Memory.

This might indicate that your hardware does not support 4GB addressing. In the 
file "/sys/dev/usb/usb_mem.c", change "BUS_SPACE_MAXADDR_32BIT" into 
"BUS_SPACE_MAXADDR_32BIT/2".

>
> There is some trouble with GENERIC kernel,
> but specifying MAXMEM, such as
>
> options        MAXMEM=(2*1024*1024)
>
^^^ remove this option from your kernel config file.

Recompile kernel and see what happens. You might also want to change this in 
the other drivers in question, and see if it makes any difference.

--HPS