Artesyn ATCA-7365 Installation and Use (November 2014) - Manual (Page 126)

BIOS
ATCA-7365 Installation and Use (6806800K65N) 126
Uncorrectable errors are logged and signaled as correctable, but change the channel state to
"Disabled", and the working partner to "Redundancy Loss".
4.7.4 Lockstep Channel Mode
The Lockstep configuration requires a minimum of two DIMMs, one in Channel 0 and one in
Channel 1. Channel 2 is not used in Lockstep Channel Mode. The ECC DRAM on each DIMM is
mapped in to two adjacent symbols so that any failure of the DRAM can be corrected. The
correction capabilities in lockstep mode are:
 Correction of any x4 or x8 DRAM device failure.
 Detection of 99.986% of all single bit failures that occur in addition to an x8 DRAM failure.
The Memory Controller will detect a series of failures on a specific DRAM and use this
information in addition to the information provided by the code to achieve 100% detection
of these cases.
 Detection of all permutations of 2 x4 DRAM failures.
4.8 Restoring BIOS Default Settings
The blade provides an on-board configuration switch that allows to load BIOS settings from the
DEFAULT area of the IPMI Boot Parameters. In order to restore the BIOS default settings using
this switch, you have to proceed as follows.
Procedure
To restore the BIOS default settings, proceed as follows:
1. Remove the blade from the system.
See Installing and Removing the Blade on page 66 for the exact procedure.
2. Set the on-board switch SW4-3 OFF and SW4-4 ON.
See Switch Settings on page 58 for the exact location of SW4.
3. Install and power up the blade.
See Installing and Removing the Blade on page 66 for the exact procedure.
4. Wait until the blade has completely booted and is up and running.