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The patch still holds true for CRC though as it is listed
separately below
https://urldefense.proofpoint.com/v2/url?u=https-

3A__developer.arm.com_architectures_cpu-2Darchitecture_a-
2D&d=DwIFAg&c=nKjWec2b6R0mOyPaz7xtfQ&r=E3SgYMjtKCMVsB-
fmvgGV3o-
g_fjLhk5Pupi9ijohpc&m=i3kC8htMiHjXMoJWUn6QlDVZQCblbFrIJyMcW
d9nAmM&s=fA4SM6O3iC2HXIK1qSbOHzxVeHoYqcfUebEOwioHC7c&e=

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profile/exploration-tools/feature-names-for-a-profile

CRC is mandatory starting in V8.1, refer to Arm-ARM document.

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Also, looks like sve2 support in n2 core might be optional as per

above doc?

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I need to check on this. Some of the info here might not be public yet.

I found [1]. SVE2 is mandatory feature.

I see thanks for the info I will remove extension from cnxk.

Do you think the extension infra is still useful for other cases? i.e. older cores
or cases where vendor wants to enable some extensions by default?

I found a document[1] which describes about extensions not enabled by
default but supported by a given march.
In case of n2 I think memory tagging is one such feature

I think the reference is providing a different information than what you are trying to achieve here.

It looks like you are trying to address a use case where in the same CPU IP has different features enabled/disabled on different SoCs.
This is a valid use case from crypto perspective (due to export control reasons) where-in 2 different SoCs might have crypto enabled/disabled. I am not sure if other features can be enabled/disabled. But, Crypto feature is a good enough reason to address such a use case.

IMO,  we should capture the SoC specific details in SoC specific files, in this case in 'arm64_cn10k_linux_gcc'. I believe there were some challenges in doing this.
Juraj, do you remember the exact issue?

[1]https://developer.arm.com/tools-and-software/open-source-
software/developer-tools/gnu-toolchain/architecture-support

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[1] https://urldefense.proofpoint.com/v2/url?u=https-
3A__developer.arm.com_ip-
2Dproducts_processors_neoverse_neoverse-
2Dn2&d=DwIFAg&c=nKjWec2b6R0mOyPaz7xtfQ&r=E3SgYMjtKCMVsB-
fmvgGV3o-
g_fjLhk5Pupi9ijohpc&m=i3kC8htMiHjXMoJWUn6QlDVZQCblbFrIJyMcW
d9nAmM&s=kP_X-Co0cl4pZ64BZqy5rAFUlkMZE-3EhTVBabm3SW8&e=

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