Re: unable to install beta6 [amd64] on Dell 2850 with 4 GB RAM,workaround

From: Scott Long (scottl_at_FreeBSD.org)
Date: 09/30/04

  • Next message: Nate Lawson: "Re: [Fwd: cvs commit: src/sys/dev/acpica acpi_pci_link.c]" 
    Date: Thu, 30 Sep 2004 10:03:45 -0600
To: Claus Guttesen <cguttesen@yahoo.dk>

    Claus Guttesen wrote:
    >>The AMR driver cannot handle >4GB of RAM. Even
    >>though you only have
    >>4GB, your chipset is remapping part of it to the
    >>
    >>>4GB region. The
    >>
    >>driver incorrectly interfaces with busdma and cannot
    >>handle this
    >>scenario very well. The panic is to be expected.
    >>You can verify
    >>this by setting the tunable 'hw.physmem' in the
    >>loader to some
    >>value under 4GB to artifically limit the amount of
    >>RAM that the OS
    >>sees.
    >
    >
    > Added hw.physmem=4G to /boot/loader.conf and it seems
    > to solve the issue. Dmesg now tells me that I have
    >
    > real memory = 3489398784 (3327 MB)
    > avail memory = 3367739392 (3211 MB)
    >
    > It seems that it does ignore some RAM, but is this the
    > correct behaviour?
    >
    > Without hw.physmem I get
    >
    > real memory = 5100273664 (4864 MB)
    > avail memory = 4125847552 (3934 MB)
    >
    > So it appears to perform an incorrect probing of
    > memory.
    >
    > Thank you.
    > Claus
    >

    That's not always the case. The system might be excluding a large
    part of the address space for some reason and mapping the RAM around
    it. Can you send a verbose dmesg to me in private?

    Scott
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