Comment # 14 on bug 1202438 from Richard Brown

Copy/Paste of my debugging info for Michael as we dug deeper in this

Image based with MicroOS 0829 using his 1202438 patched grub2

TPM 2.0 On + Enabled in the BIOS, Dell 5510 (so, default settings). Boot fails,
tpm-hello below

Hello!
TPM 2.0
HashAlgorithmBitmap 0x3
TPMPresentFlag 0x1
NumberOfPcrBanks 0x2
ActivePcrBanks0x3

TPM 2.0 Off  in the BIOS, Dell 5510. Boot WORKS! (YAY!), tpm-hello below

Hello!
No TPM Handle found!


TPM 2.0 On but Disabled, Dell 5510, Boot FAILS (meh) tpm-hello below

Hello!
TPM 2.0
HashAlgorithmBitmap 0x3
TPMPresentFlag 0x1
NumberOfPcrBanks 0x2
ActivePcrBanks 0x3

So, it seems there's no difference between On+Enabled and On+Disabled, but
turning the TPM off does work with your patch