skiboot-5.4.2 was released on Friday December 2nd 2016. It replaces skiboot-5.4.1 as the current stable release.
Over skiboot-5.4.1, we have two bug fixes exclusively aimed at machines with TPMs:
i2c: Add nuvoton TPM quirk, disallowing i2cdetect as it can hard lock the TPM
p8-i2c improve I2C reset code path, solves getting stuck resetting i2c engine