PCI Express LTSSM stress using BMC-based Embedded JTAG/ITP
Summary
The 44-minute, 29-second combination presentation and demonstration covered a lot of material: among the highlights were detailed technical coverage and demos on: If you’ve gotten this far, you’re probably familiar with the Intel CScripts, and how they are used for design validation, debug and test. Running one loop in this environment took about 49 seconds – rather slow, due to a lot of overhead associated with the PC-based Python interpreter, the middleware on the PC, the Ethernet connection between the host and target, the logging of transactions for debug purposes, and other factors. To overcome this latency issue, one approach is to take the Python-based CScript, re-write it in ‘C’, and port it to run down on a BMC, invoking the run-control API directly within our SED firmware. Security – by avoiding the Ethernet backhaul, and having the application run autonomously on the BMC, the network connection is eliminated as an attack surface. Another training code sample we provide in our SED firmware is dumpmca, that dumps the machine check architecture (MCA) registers for a given socket(s), thread(s) and bank(s).
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