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List: linuxbios
Subject: [coreboot] [coreboot - Bug #429] I2C CR50 TPM fails to initialize
From: Matt DeVillier <coreboot () fe80 ! eu>
Date: 2022-10-18 19:59:16
Message-ID: redmine.journal-1194.20221018195915.700 () fe80 ! eu
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Issue #429 has been updated by Matt DeVillier.
proposed fix: https://review.coreboot.org/c/coreboot/+/68550
----------------------------------------
Bug #429: I2C CR50 TPM fails to initialize
https://ticket.coreboot.org/issues/429#change-1194
* Author: Matt DeVillier
* Status: New
* Priority: High
* Target version: none
* Start date: 2022-10-17
* Affected versions: 4.15, 4.16, 4.17, master
----------------------------------------
On several (but not all) Chromebook platforms which use an I2C interface for the CR50 \
TPM, the TPM fails to initialize due to I2C transaction errors.
The following boards with I2C CR50 TPM are known to be affected:
google/brya (banshee variant confirmed, others untested)
google/drallion
google/poppy (soraka and nautilus variants)
google/reef (all variants)
The following boards with I2C CR50 TPM are known to be working:
google/eve
google/guybrush
google/kahlee
google/zork
cbmem shows the following, with the i2c transactions repeating 100x until failing. \
This causes a significant increase in boot time.
```
[INFO ] Probing TPM I2C: i2c 2:50 W 1 bytes : 06 \
[ERROR] I2C TX abort detected (00000001) \
[ERROR] cr50_i2c_read: Address write failed \
[INFO ] .i2c 2:50 W 1 bytes : 06 \
[ERROR] I2C TX abort detected (00000001) \
[ERROR] cr50_i2c_read: Address write failed \
...
```
soraka/nautilus show slightly different output:
```
[INFO ] Probing TPM I2C: Cr50 TPM IRQ timeout!
[INFO ] .Cr50 TPM IRQ timeout!
[INFO ] .Cr50 TPM IRQ timeout!
[INFO ] .Cr50 TPM IRQ timeout!
...
```
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