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(and i quote:)
This will enable ECC test mode. This ECC mode can detect and
correct single bit error[s], detect double bit errors, and detect all
errors confined to a single nibble. When this mode is enabled, all
DRAM latencies are increased by one cycle.
As a practical matter, it seems to be not working right...
regards
dwp
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After investigation by Engineering & Support team:
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To: Eric Gauthier Date: 7-Mar-1997
Ron Sarkozy From: Dave Pierson
Yasunori Kobayashi Dept: TOEM Support Engineering
Phone: 508-841-3020
Loc/Mail Stop: SHR3-1/D20
[email protected]
Subject: EBM3x-PA (DMCC Pentium SBC)
Please forward to the FAEs.
Product:
EBM3x-PA
Short version:
NO risk.
Problem
One of the settings in the BIOS set up function allows the user
to make the SBC unusable.
Fix:
Leave the ECC Test Enable function as it is in the factory default.
If it has been modified, reset it to the default, as below.
================================================================
From the EBM3-PA vendor:
>The "ECC Test" enable/disable setup question under the AMIBIOS Chipset
>setup menu sets bit6 of TXC configuration register 50h3D 1. This
>forces DRAM memory parity data (MPD[7:0]) to "0" during DRAM writes.
>During reads, MPD[7:0] are compared according to the selected DRAM
>integrity algorithm and the appropriate error status is generated.20
>As you've probably realized, ECC test mode requires 36 bit SIMMs and
>has little use outside of a manufacturing/engineering test environment:
>when the ECC Test setup option is enabled, it essentially forces
>errors to occur under normal circumstances. This option may be removed
>from from Setup in future BIOS releases.
>If the user does enable ECC Test mode, the system may appear to hang.
>If this happens, there are three methods of recourse:
> 1) hold down the <INSERT> key during boot:
> this allows the user to enter Setup and change settings;
> 2) hold down the <END> key during boot,
> this causes the BIOS to reload the Optimal Default settings; and
> 3) remove the CMOS backup battery for 10 to 30 seconds, this
> clears the memory containing the BIOS settings.
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