This cpu has RSA signed patchfile.

cpu006FB_plat01_ver000000C1_2011-10-04_PRD_0EF87396.bin[  709.478819] ucode_loader: Update took 15719179 cycles, vendor 'GenuineIntel', cpuid=0x000006FB, old rev 0xC100000000 -> new rev 0x0

Attempt to load hand crafted non-RSA patch (with same LFSR key as CPUID 6F6, but also same iv/seed) fails:

[  582.866309] ucode_loader: loaded 4096 bytes from '../../test6FB.bin'
[  582.866313] ucode_loader: WRMSR(0x00000079, addr=0xF3977030)
[  582.866525] ucode_loader: Update took 488145 cycles, vendor 'GenuineIntel', cpuid=0x000006FB, old rev 0x0 -> new rev 0x0

TSCdiff value is same as for completely invalid patch, so it's probably rejected in early stages of loading.

This project is an independent, unofficial work based on publicly available information and reverse-engineering research, and is not affiliated with, endorsed by, sponsored by, or associated with Intel Corporation or its affiliates. It is provided "as is", without warranty of any kind. The author assumes no responsibility or liability for any use, misuse, damage, data loss, hardware failure, or other consequences arising from its use. Intel, Pentium, Core and related trademarks are the property of their respective owners and are used solely for identification and informational purposes.
  • index page
  • uop description
  • ADC
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  • AND
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  • DIV
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  • U_JCC
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  • WRSEGFLD
  • WUCONCAT
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  • WUINSERT
  • WUMERGE
  • XOR