Issue with i9-10900TE while activating PAE on linux kernel 5.15.x

oartigues

1/24/24, 8:54 AM

I've to compile a linux 32b kernel 5.15.86 RT56 for running on 2 different computers with Intel CPUs : one with an i7-9700TE and 32Gb RAM, and the other one using an i9-10900TE with 64 Gb RAM.

I need to activate the support of 64Gb of RAM (CONFIG_HIGHMEM64G=y) + PAE (Physical Address Extension) Support (CONFIG_X86_PAE=y)

Once the linux kernel is compiled, it is working correctly on the i7-9700TE CPU computer. No issue there. But impossible to start it on the i9-10900TE CPU computer : black screen at startup without any keyboard, nothing. It is saying that such a result occurs when the CPU is not PAE compatible...

I've checked on the Intel description of the Intel i9-10900TE where PAE compatibility is set.

If I disable the PAE (Physical Address Extension) Support (CONFIG_X86_PAE=n) and set support of 4Gb of RAM instead of 64Gb (CONFIG_HIGHMEM4G=y), then the i9-10900TE CPU computer is starting correctly using the compiled linux 32b kernel 5.15.86 RT56, but with limited RAM support which is not what I'm expected.

I've asked about this issue to Intel community, but they asked me to post my query on Ubuntu community.
The Ubuntu community asks me to forward it to kernel.org.
The kernel.org asks me to forward it to serverfault.com. But I don’t know if this is the correct channel. I hope so.

Could you please tell me why it is not possible to enable 64Gb of RAM (CONFIG_HIGHMEM64G=y) + PAE (Physical Address Extension) Support (CONFIG_X86_PAE=y) on an Intel i9-10900TE cpu ?

I can forward full .config kernel compilation file for checking if needed, even if I don't know how to do that.

Best regards Olivier

Best regards,

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