> Hello > I'm trying to issue TPM2.0 PPI commands (operation > 22) with no success. > Is there any known issue with it? > > Is there a reason PPI_TPM_REQ_MAX is set to 22? Could it be set to 127 so > we can check in tcg_operations which commands are implemented or not? > > Thanks > -Víctor Gonzalo The current tpm_ppi.c driver is a bit dated. It does not recognize v 1.3 correctly, it does not support commands with arguments, (23 requires the bank bitmask as an argument), and it limits the display to < 23. I'm working on a patch, and have successfully issued 23 (PCR_Allocate). Note that not all vendors implement 23 as it could lock users out of Bitlocker systems. My HP Spectre does, but apparently Dell's don't in general. I was planning on sampling different systems once the driver update is working. dave
