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Initialize and Access of 256KB OCM (SRAM)

Former Member


During the boot time, the boot ROM will load the FSBL image from Flash to 192KB OCM (lower addr space).

I am wondering at what stage the unused 192KB and the upper 64KB OCM will be initialized? Is the initialization at BootROM or FSBL stage?

Is that a way that I can access the OCM before the initializaiton step or control the initialization process?

Thanks.

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  • 0 in reply to Former Member

    Thanks for the comments. When the BootROM loads the FSBL to OCM, will it first initialize the 192KB+64KB OCM to all zeros? I would like to check the power-up states of OCM SRAM but now I see all unused OCM intialized to zeros after FSBL. I am wondering whether I could customize the FSBL to extract the uninitialized OCM. However, if the 256KB OCM initiliazation is done at BootROM stage, then nothing could help. Thanks.