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ESXi 5.1 with patch ESXi510-201407001 and ESXi 5.5 Update 2 might fail to boot if TXT is disabled but TPM is enabled in the system BIOS of the host with Intel Xeon processor E5 v3 series
Some systems with Intel Xeon processor E5 v3 series might expose BIOS options for both Trusted Platform Module (TPM) and the Trusted Execution Technology (TXT) features. On such systems, the ESXi host might fail to boot if TXT is disabled but TPM is enabled in the BIOS. This issue occurs as the ESXi host needs both the features to be disabled in the BIOS for a successful boot. Workaround: Ensure that TPM is disabled along with TXT in the BIOS during the configuration of the system BIOS.
KB:2087032