I have referred to the page you have mentioned and have tried to use the standalone DDR tool but can't seem to find the correct settings. I was to try to use Config tools to see if maybe it would give me little more insight as to what is going on. This is the end of the log file where the error happens.
DEBUG memtool.common.factories new instance -> <memtool.processor.imx8m.mimx8mm.MIMX8MM object at 0x00000275A788FA00>
DEBUG memtool.common.factories new instance -> <memtool.processor.imx8m.mimx8mm.MIMX8MM object at 0x00000275A788FA30>
INFO memtool.phyinit.phy_init Run phyinit for 2017.09\ddr3
DEBUG memtool.phyinit.phy_init Shared library C:\ProgramData\NXP\mcu_data_v11\processors\MIMX8MM5xxxLZ\ksdk2_0\mem_validation\ddrc\phyinit\sharedlib\phyinit_2017.09_ddr3.dll
DEBUG memtool.common.factories new instance -> <memtool.phyinit.phy_init.PHYInitDriver object at 0x00000275A78C3460>
DEBUG memtool.phyinit.phy_init PHY config file C:\Users\slira\AppData\Local\Temp\mem_validation\phy_config_final.json
DEBUG memtool.phyinit.phy_init Phyinit output file C:\Users\slira\AppData\Local\Temp\mem_validation\phy_training_out_1d2d.txt
[Error]// [dwc_ddrphy_phyinit_setUserInput] unknown PhyInit field name 'Lp4RxPreambleMode[0]'
I am not sure what setting is tied to 'Lp4RxPreambleMode[0]'
If this is tied to the memory, we are using ISSI part # IS43TR16K01S2AL-125KBL.
Datasheet for ISSI part: https://www.issi.com/WW/pdf/43-46TR16K01S2A-AL.pdf
These are the settings I am using for this part.

When I run the test I different results in Step 2: DDR memory accessing. This is a sample of one of the runs.

The address of failure can change on different runs as well as the both patterns.
Any insight would be much appreciated.