Comment 3 for bug 1973375

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James O'Connor (jpoc) wrote : Re: Please test secure-boot and lockdown on the early 5.18 kernel (ppc64le)

My witherspoon openpower firmware successfully boots. The next roadblock is that I need a secure boot override jumper opened on the planar of the test system. An internal lab ticket has been opened for that. I will test both the 5.18 and 5.19-rc ppc64el kernels above.

https://developer.ibm.com/articles/protect-system-firmware-openpower/

"Secure boot is enabled by means of a secure mode override jumper on the system board. When the jumper is removed, secure mode is in force and the secure boot code in each component is activated. When the jumper is in place, secure mode is disabled, in which case the boot process will ignore the container metadata and load any image from PNOR, signed or unsigned."