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EL3 execution

segfault

Hello Experts,

I need to operate a custom app at EL3 on a Cortex-A53 core running on the i.MX8 based  platform. The bootflow shows me that a hand-off from ATF (BL31) to U-boot (BL33) is where the transition from EL3 to EL2 occurs for Uboot and it stays at EL2.

Can anyone suggest a procedure or mechanism to keep the Uboot and custom apps running at EL3? Are there any examples ?

Thanks in advance.

Parents
  • 0 in reply to Martin Weidmann

    Thanks for the reply. The EL3 requirement is imposed by the BSP vendor supplying the RTOS. At this time the purpose is not clear. Currently, I can see U-boot operating after BL31 handoff at EL2.

    Can you suggest what can be customized in BL31 (ATF) for initial experiments?

    I tried some mods to BL31 code to avoid the EL2 setup but that appears to fail. 

Reply
  • 0 in reply to Martin Weidmann

    Thanks for the reply. The EL3 requirement is imposed by the BSP vendor supplying the RTOS. At this time the purpose is not clear. Currently, I can see U-boot operating after BL31 handoff at EL2.

    Can you suggest what can be customized in BL31 (ATF) for initial experiments?

    I tried some mods to BL31 code to avoid the EL2 setup but that appears to fail. 

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