Dear U-boot mailing list,

We are currently trying to boot a linux kernel on a custom Zynq Ultrascale+ based board. Our goal is to run a 32-bit linux kernel on the 64-bit FPGA. In order to do this, we want to boot all (4) the CPU's in Exception Level 1 (EL1). We already found a flag called CONFIG_ARMV8_SWITCH_TO_EL1 in include/configs/xilinx_zynqmp.h (which is normally commented out). When we enable this flag, it successfully switches one CPU (the one running U-boot) to EL1, but it leaves the others untouched. Is there anything else we need to set so all of the CPU's will switch to EL1?

Met vriendelijke groet / Kind regards,

Kevin Peeters Designer

[Prodrive B.V.]http://www.prodrive-technologies.com/ Mobile

+31 62 57 28 374

Phone

+31 40 26 76 200

Address

Science Park Eindhoven 5501

5692 EM SON, The Netherlands

www.prodrive-technologies.comhttp://www.prodrive-technologies.com

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