My x230's TPM has gone missing somewhere between 4.5 and the current head. CONFIG_LPC_TPM is still set, but neither coreboot nor the Linux payload detects it. Bisecting will take a while since it requires reflashing; does anyone know where it might have gone?
On Mon, Dec 12, 2016 at 11:37:30AM -0700, Trammell Hudson wrote:
My x230's TPM has gone missing somewhere between 4.5 and the current head. CONFIG_LPC_TPM is still set, but neither coreboot nor the Linux payload detects it.
Based on a tip, I reverted this patch:
https://review.coreboot.org/#/c/17425/
And the x230 can find its TPM and my measured boot works again.
Also, I mispoke slightly before. With the current head coreboot finds the TPM (cbmem --console shows the call to tpm_init()), but Linux is not able to make use of it. This makes it seem like the runtime TPM ACPI table entry generation is the problem.
On Mon, Dec 12, 2016 at 1:12 PM, Trammell Hudson hudson@trmm.net wrote:
On Mon, Dec 12, 2016 at 11:37:30AM -0700, Trammell Hudson wrote:
My x230's TPM has gone missing somewhere between 4.5 and the current head. CONFIG_LPC_TPM is still set, but neither coreboot nor the Linux payload detects it.
Based on a tip, I reverted this patch:
https://review.coreboot.org/#/c/17425/
And the x230 can find its TPM and my measured boot works again.
Also, I mispoke slightly before. With the current head coreboot finds the TPM (cbmem --console shows the call to tpm_init()), but Linux is not able to make use of it. This makes it seem like the runtime TPM ACPI table entry generation is the problem.
Can you provide the isal -d dumps of before and after for your board? I think in one they'll be in SSDT and the other in DSDT. They should reside in /sys/firmware/acpi/tables/ that you can copy them and run them through iasl -d.
-- Trammell
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Trammell Hudson