Software Optimization for Early Linux Boot for Time Critical...
summary
Using an AM62P reference platform a custom multi-threaded SBL boots R5 cores and the device manager in parallel, reuses ROM-initialized boot peripherals, and tunes OPI NOR to 1666MHz to skip A53 SPL and U-Boot and directly load TF-A and a stripped Linux, cutting boot from ~25s to about 1.7s total while bringing up the MCU chime and splash in ~125 ms and the display app by ~1.5 s. Filesystem experiments (initramfs, ext4, UBIFS, squashfs) reveal surprising mount-time tradeoffs.
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chapters (15)
- 0:00Texas Instruments boot optimization
- 1:08Heterogeneous early boot problem
- 2:10TI AM62P boot sequence
- 3:54R5 SPL and DDR challenges
- 6:05Optimized bootloader design
- 7:54SPL limitations in OS stack
- 9:19Stage two bootloader integration
- 11:26MCU early boot for time-critical
- 12:52Kernel and filesystem optimization
- 13:34Unnecessary kernel configs removed
- 14:38Initramfs and init manager
- 15:22Filesystem mount performance
- 16:52Boot sequence benchmarks
- 17:58Upstreaming boot time challenges
- 19:22Q&A
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