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Date:      Wed, 16 Dec 1998 23:57:01 -0800
From:      David Greenman <dg@root.com>
To:        Sam Pigg <sam@redbacknetworks.com>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: tyan S1836DLUAN >512Mb problems 
Message-ID:  <199812170757.XAA19359@root.com>
In-Reply-To: Your message of "Wed, 16 Dec 1998 23:45:47 PST." <199812170745.XAA21794@phred.redbacknetworks.com> 

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>
>>> Trying to use 1 gig of memory on a tyan S1836DLUAN (dual 450 PII's)
>>> running 3.0-RELEASE, keep having problems with the system freezing up,
>>> rebooting, compiles failing due to signal 11's etc. If I decrease the
>>> memory to 512 megs (I'm using those weird micron 256meg simms btw)
>>> everything works fine. Tyan claims this motherboard can support up to
>>> '1GB SPD SDRAM or SDRAM+ECC in addition to the new 100MHz
>>> SDRAMs'
>>>
>>> This motherboard uses the 440GX chipset, but another system with
>>> a tyan S1832DL (440BX chipset) suffers from the same symptoms when
>>> >512 megs of ram are installed.
>>
>>The problem is not with the motherboard. Most of the mother boards that
>>support SMP PII's have the same problem.  I was unable to locate where in
>>the configs the problem comes from though.  I was testing dual PII 400
>>when they were first avalible from Compaq with 1.0 gig of 256meg dimms.
>>They are recognized fine by the bios but FreeBSD won't work with it.   I
>>tested NT, Novell, and Sco all of which work although no where near as
>>well and the system with 512meg and SMP FreeBSD.
>>
>>Rob.
>
>
>I've upgraded the board bios, changed to a new memory vendor, etc etc.
>Still have exactly the same symptoms, and from what rob said it would
>seem this problem is specific to freebsd, and not any particular motherboard.
>
>Is anyone actually running a freebsd machine with more than 512 megs of
>memory? Anyone have a clue at all as to why freebsd can't support
>a gig of ram? windblows seems to have no problem (which doesnt help me much)

   Wcarchive is a Tyan 1662D (dual P6) motherboard with 1GB of RAM. Works
great. Your problems sound like memory bus loading issues.

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project

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