This application report describes the procedure to achieve fast boot using Linux on the DRA821/J7200/J7VCL platform. The details captured here are directed towards replicating the results on the DRA821. However, this concept can be very easily extended to other devices in the Jacinto 7 family.
This document enables achieving a Linux prompt in approximately 3 seconds using an optimized filesystem (tisdk-tiny-image) and reduced DTSI.
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Regarding how to build the Linux/RTOS for DRA821U, see the Understanding bootloaders in Processor SDK J7200 (RTOS/Linux) section.
Regarding how to set up the EVM to test, see the Jacinto7 DRA821 Evaluation Module (EVM) User's Guide.