Diagnostics for Samsung SSD EVO 840
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LICENSE Initial commit Jan 18, 2017
README.md README: Fix up JTAG information Jun 27, 2017
mex1.conf Add files via upload Jan 18, 2017
ssddiag.pl Added GPIO diagnostics May 3, 2018



Diagnostics software for Samsung SSD EVO 840 problems


  • detects the firmware version from the running code.
  • looks whether the controller is able to see a SATA connection, and whether the firmware was able to establish the connection.
  • checks the 8 Flash channels
  • analyzes Stack-Traces
  • analyzes the Inter-Process-Communication between the ARM cores, and explains their meaning
  • takes approximately 1 minute to execute

System requirements:

  • OpenOCD.org and a supported JTAG adapter (must be 1.8v tolerant, FT2232H-based adapters are common and work well)
  • Perl.org

Supported SSDs:


Supported controllers:

  • SAMSUNG S4LN045X01-8030 (MEX)

Supported Firmware:

  • EXT0BB6Q
  • EXT0CB6Q

Supported JTAG adapters (1.8v tolerant):

Usage: Adapt mex1.conf to your JTAG adapter Run ssddiag.pl

If you want additional diagnostics, run it with --debug parameter, but this can increase the runtime from 1 minute to 60 minutes.

If you need more information, please read the Repair Manual: http://www2.futureware.at/~philipp/ssd/TheMissingManual.pdf

Sample diagnostics can be found here: http://www2.futureware.at/~philipp/ssd/diag/