Is it possible to mod a Dell R740 BIOS to support the microcode and boot with a non-standard public production intel CPU? In this case an Intel Xeon Platinum 8275CL Socket 3647 which was a custom CPU Amazon had Intel create for their C5 AWS Servers. I know it works with some other brand systems already, but it does not current work in the Dell servers. I have tried it in my R740 and it won't post\boot.



R740-021102C.cap
Dell EMC Server PowerEdge BIOS R740/R740xd/R640/R940/7920R Version 2.11.2

dl.dell.com/FOLDER07290108M/1/BIOS_92RFG_WN64_2.11.2.EXE
Extract with 7zip or similar, BIOS is in Payload folder

Bios release notes:
- Updated the "Processor and Memory Reference Code" for the second-generation Intel Xeon Processor Scalable Family to IPU 2021.1.
- Updated the Processor Microcode to version 0x3102 for the second-generation Intel Xeon Processor Scalable Family.
- Updated the Processor Microcode to version 0x6B06 for the Intel Xeon Processor Scalable Family.
- Updated the Purley Refresh PV Candidate Reference Code Version 612D02.
- Updated the AEP Release 1.0.0.3515 files to Purley Refresh UEFI Source.
- Updated SPS to SPS_E5_04.01.04.505.0 (IPU 2021.1) for Purley Refresh.
- Enhancement to address the security vulnerabilities (Common Vulnerabilities and Exposures - CVE) such as CVE-2021-21555, CVE-2021-21556, CVE-2021-21557, CVE-2020-24511, CVE-2020-12358, CVE-2020-12360, CVE-2020-24486.

GenuineIntel Family 6 Model 85 Stepping 7
Cascade Lake-SP
2nd Generation Intel® Xeon® Scalable Processors
cpu-world.com/CPUs/Xeon/Intel-Xeon%208275CL.html

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 85
model name : Intel(R) Xeon(R) Platinum 8275CL CPU @ 3.00GHz
stepping : 7
microcode : 0x5000017
cpu MHz : 3000.000
cache size : 36608 KB
physical id : 0
siblings : 48
core id : 0
cpu cores : 24
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single kaiser fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx avx512f rdseed adx smap clflushopt clwb avx512cd xsaveopt xsavec xgetbv1 ida arat
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass
bogomips : 6000.00
clflush size : 64
cache_alignment : 64
address sizes : 46 bits physical, 48 bits virtual
power management:

This is a DELL proprietary system bios...only SLIC tool could open the file but not the CAP in the refereed folder, only after EXE to ROM.
Not seeing an easy way of any kind of mod in this file, but can w8 for other users opinion.