skiboot 5.9.7 was released on Friday December 22nd, 2017. It replaces skiboot-5.9.6 as the current stable release in the 5.9.x series.
Over skiboot-5.9.6, we have two bug fixes, they are:
phb4: Change PCI MMIO timers
Currently we have a mismatch between the NCU and PCI timers for MMIO accesses. The PCI timers must be lower than the NCU timers otherwise it may cause checkstops.
This changes PCI timeouts controlled by skiboot to 33-50ms. It should be forwards and backwards compatible with expected hostboot changes to the NCU timer.
p8-i2c: Limit number of retry attempts
Currently we will attempt to start an I2C transaction until it succeeds. In the event that the OCC does not release the lock on an I2C bus this results in an async token being held forever and the kernel thread that started the transaction will block forever while waiting for an async completion message. Fix this by limiting the number of attempts to start the transaction.