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Booting from Flash performance issue

Former Member

Hi, I'm noticing a huge difference in the application code performance between booting out of Flash and running off JTAG from SDK. Happens when I try to run from both QSPI and SD card. I checked the init_ps7.tcl against the init_ps7.c code, and it pretty much lines up. The FSBL runs both ps7_init() and ps7_post_config(), and the registers configurations contained within match line by line.

Has anyone else seen this? Maybe I'm missing something like a linker setting? Could a peripheral in the PL be causing this?

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    So, you are saying that performance in the Flash-booted scenario is worse than the JTAG-booted. Correct? That does seem odd. Are you loading the bitstream in the JTAG case? Are you using the same ELF in both cases for the application?

     

    The most likely culprit in that case is the FSBL not matching the init TCL, but you appear to have already checked that. 

     

    You can improve performance by changing from the default Debug Build Configuration to Release, but I'm guessing you are using the same Build Configuration for both. 

     

    Bryan