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MCBSTR9: PFQBC (Prefetch Queue) Enable in STR91X.S


Information in this article applies to:

  • MCBSTR9 Evaluation Boards

QUESTION

It appears that the Prefetch Queue is disabled in the startup file STR91x.s. 

Is this correct, and what do I need to change on the STR91x.S file?

ANSWER

Rev. D devices enable the Prefetch Queue by default. For earlier revisions, you may enable the Prefetch Queue (PFQ/BC) by changing the definition of SCU_SCR0_Val to the following in the STR91x.S file:

SCU_SCR0_Val    EQU     0x00000197

Setting this value to 0x00000196 disables the Prefetch Queue.

MORE INFORMATION

  • ST Reference Manual for STR91xF

Last Reviewed: Wednesday, January 20, 2021


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