Specifications

portions of these patterns in the memory to fill the memory and as Hamming patterns (such as
Hamming [8,4], Hamming[16,11], Hamming[32,26] or Hamming[64,57]) encoding with the additional
most significant byte (MSB) parity bit to cover the parity bits in the Hamming code. This allows for
detecting multiple bit errors.
• Data Cache — Performs a rotation of a 16MB array in four clockwise rotations for 16 iterations of the
complete rotation. The 16MB size ensures that memory is not within the cache lines and causes cache
ejections through each of the rotations.
CLI Options
./memtool - Memory Tool
version 2.0
admin, 2014-10-01, bamboo-build-num
Syntax: ./memtool <option>
--h := show this help
--list := list all of the memory regions
--version := Display the version of the memtool
--info --region=# := display configuration info of device
--test [--region=#] [--testlist=test0,test1... ] := test all memory or specified
memory region
--read --region=# --addr=address --count=bytes := read the specified physical
address
--write --region=# --addr=address --val=data0,data1, ... ,dataN := write at the
specified physical address
Available Tests are:
ALL_TESTS, ADDRESS_READ, ADDRESS_WRITE, ADDRESS_WALKING1, ADDRESS_WALKING0,
DATA_READ,
DATA_WRITE, DATA_WALKING1, DATA_WALKING0, DATA_SLIDING1, DATA_SLIDING0,
DATA_PATTERN, DATA_CACHE
The memtool uses long options for the parameters which requires two hyphens in front of the options.
Options are required, optional, or none. If a parameter is required, it is specified as such and must include an
equal sign; if an option is optional, it is enclosed with square brackets. However, do not type the brackets at
the CLI. For example, the
-region and -testlist options are optional and you must enter them as -
region=0 and -testlist=0.
• List — Lists the memory regions known by SDI. The tool queries SDI for the regions and prints a list of
the regions with a region number that you can use for the subsequent options requiring a region
number.
• Info — Lists the SPD information for the specified regions. Specifying a region allows the tool to read
SPD from different DIMM modules, each specified in its own region. The output lists the actual data read
and completes some parsing of the parameters so you do not have to decode the values. Decoding is
based on the SPD standard definition for DDR3 and DDR4 DIMM memory.
• Test — Runs tests that include: Address Read/Write, Address Walking 1/0, Data Read/Write, Data
Walking 1/0, Data Sliding 1/0 and Data Patterns (that writes Hamming patterns that you can use to
detect multiple bit errors and identify single bit errors). These tests run during the normal memory tests.
In extended memory tests, the data cache memory test runs — this is a lengthy test to cause multiple
ejections of data from the cache and testing the caches.
In Verbosity 0, only the pass/fail message prints for all of the tests. In Verbosity 1, each test prints its own
pass/fail and other information; for example, what failed in the test. Higher verbosities show where each
pass of the test performs and has verbose output. All output, regardless of verbosity, is in the log. You
can see every level of detail by referring to the log.
• Read — Reads physical memory locations. You can loop over address read cycles to look for data that is
volatile or read physical devices on the memory bus (localbus for Power-PC processors). You can
specify a region, address, and count of successive bytes to read.
Dell DiagOS Tools 58