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To run the test, select Memory from the Main Menu, Extended Pattern Test, and press
<Enter>. If no errors occur, select Return to main menu when this test finishes. Select
Browse error list if errors occur.
Walking 1s test
This test uses the Walking 1s Left Test and the Walking 1s Right Test routines to
identify shorts on data lines and data bits stuck at 1. Run this test if the BIOS finds
memory errors or memory problems constantly occur.
To run the test, select Memory from the Main Menu, Walking 1s Test, and press
<Enter>. A list of parameters appears:
You can specify the beginning and ending memory locations in the Memory Start and
Memory End fields. If the displayed percentage is less than 100%, the percentage is
the amount of system memory between the Memory Start and Memory End values
tested.
You can also specify the size of the bit pattern that is written to memory in this test in
the Pattern Size field. By changing the bit pattern size, otherwise undetected memory
errors will be discovered. You should change this parameter to ALL to perform the
most thorough memory error detection test. The bit pattern sizes are 8 bits, 16 bits, 32
bits, or all bit pattern sizes. The default is 8 bits. This test sequentially turns on all bits
in system memory in a rolling pattern. The pattern is constructed so that only one bit
of each byte is 1 at any time.
Walking 0s test
The Walking 0s test writes shifting patterns to memory to find memory errors. This
test uses two test routines to identify open data lines. The two routines are the
Walking 0s Left Test and the Walking 0s Right Test. Run this test if the BIOS POST
routines report memory errors or the system has constantly recurring memory
problems.
Run the TestSelect Memory from the Main Menu and Walking 0s Test. Press <Enter>
to start the Walking 0s Test. A list of parameters appears, as shown below:
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Hardware Maintenance Manual: xSeries 380
Test Name
Write/Read Cycle
This subtest runs diagnostics using both read and write instructions.
Read Cycle
This subtest runs diagnostics using read instructions.
Description
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