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

From: Claus Guttesen (cguttesen_at_yahoo.dk)
Date: 09/30/04

  • Next message: Ceri Davies: "Re: Bug in #! processing" 
    Date: Thu, 30 Sep 2004 14:09:46 +0200 (CEST)
To: Scott Long <scottl@FreeBSD.org>

    > 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

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  • Next message: Ceri Davies: "Re: Bug in #! processing"

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