Re: tpm_tis TPM2.0 not detected on cold boot
From: Michael Niewöhner
Date: Tue Jan 01 2019 - 11:16:21 EST
On Mon, 2018-12-31 at 16:17 -0500, Mimi Zohar wrote:
> On Sun, 2018-12-30 at 14:22 +0100, Michael NiewÃhner wrote:
> > > difference is that on a cold boot, the TPM takes longer to initialize.
> > Well, as I said. Waiting for 10, 20 or even 60 seconds in the boot manager
> > does
> > not solve the problem. So the problem is NOT that the TPM takes longer to
> > initialize. Even adding a delay of 20 seconds before TPM init does not solve
> > that while that should be more than enough time.
> The purpose of commenting out the TPM2 selftest was to minimize the
> TPM initialization delay, so that the TPM is ready before IMA. After
> James' patch that wasn't needed anymore.
> Looking back at this thread, I see you're using systemd-boot, not
> grub2. When you commented out the systemd-boot timeout, IMA found the
> TPM. The question is why isn't the TPM ready with the timeout before
> IMA (like above)? Has systemd-boot done the selftest?
I am not sure wether systemd-boot touches TPM at all but I get the same
behaviour with syslinux-efi.