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Just got a new 1287-compatible and swapped it out. No luck. The
settings must be stored in the 1230 NVRAM chip. Now I just have to
find one of those. 

Thanks for all your help!

Zach Lowry || Murfreesboro, TN || www.zachlowry.net
Linux / *BSD / Irix / Solaris / Apple / Unix Network Administration

Registered Linux User #264589
14 Different NetBSD-Supported Machines


> -----Original Message-----
> From: Izumi Tsutsui [mailto:tsutsui@ceres.dti.ne.jp]
> Sent: Saturday, February 08, 2003 10:33 AM
> To: zlowry@directvinternet.com
> Cc: tsutsui@ceres.dti.ne.jp
> Subject: Re: RiscServer 4200 and Serial Console
> 
> 
> Hi,
> 
> Sorry for late responce (I've missed your mail in my mbox).
> If you don't mind, please cc: to the public list to share
> information.  
> 
> In article
> <HGEIJJKCLGJLHGNAPIGMKENLHIAA.zlowry@directvinternet.com>
> zlowry@directvinternet.com wrote:
> 
> > Well, I found another DS1287, or, more specifically, a knock-off.
> > An "ODIN OEC12C887A" which I think will work. Odd thing is,
> > there's 2 clock chips on the 4200. One is a DS1230Y-150, with
> > 256k NVRAM on it. The other is a "Benchmarq bq3287mt". Any idea
> > on which one to
> > replace, or both? I looked on line and apparently only the
> > Benchmarq chip is a 1287 compatible, the other isn't, but it has
> > the NVRAM on it. 
> 
> I think ARC machines actually have two NVRAMs, but I don't know
> which NVRAM has what contents.
> 
> According to src/sys/arch/arc/include/rd94.h, there are
> at least three address region for NVRAMs and it looks
> environment variables on ARC BIOS are stored "Unprotected NV-ram"
> area, but I have not tested which region is which NVRAM.
> (at least, MAC address was stored in "Protected NV-ram" area.)
> 
> Anyway, ARC machines see checksums on NVRAMs, and if checksum
> is wrong BIOS will initialize all contents with default values,
> so it's worth to try to reset NVRAM contents before replacing it
> (that the way I did).
> ---
> Izumi Tsutsui
> tsutsui@ceres.dti.ne.jp

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