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+.. _skiboot-5.0:
+
+===========
+skiboot 5.0
+===========
+
+Skiboot 5.0 was released Friday 10th April 2015.
+
+Changes in 5.0 (since rc3):
+
+ - Fix chip id for nx coprocessors.
+ - hw/ipmi: Fix FW Boot Progress sensor
+ - bt: Add a temporary workaround for bmc dropping messages
+ - FSP/CUPD: Fix lock issue
+
+Changes in rc3 (since rc2):
+
+ - add support for cec_power_down on mambo
+ - external/opal-prd: Use link register for cross-endian branch
+ - opal header file rework, Linux and skiboot now very closely match (API
+   in opal-api.h)
+ - libflash: don't use the low level interface if it doesn't exist
+ - libflash/file: add file abstraction for libflash
+ - external: create a GUARD partition parsing utility
+
+Changes in rc2 (since rc1):
+
+ - opal: Fix an issue where partial LID load causes opal to hang.
+ - nx: use proc_gen instead of param
+ - use chip id for NX engine Coproc Instance num
+ - Fix (hopefully) missing dot symbols in skiboot.map
+ - exceptions: Catch exceptions at boot time
+ - exceptions: Remove deprecated exception patching stuff
+ - mambo: Make mambo_utils.tcl optional
+ - mambo: Exit mambo when the simulation is stopped
+ - add NX register defines
+ - set NX crb input queues to 842 only
+ - core: Catch attempts to branch through a NULL pointer
+ - plat/firestone: Add missing platform hooks
+ - plat/firestone: Add missing platform hooks
+ - elog: Don't call uninitialized platform elog_commit
+ - external/opal-prd: Use "official" switch-endian syscall
+ - hw/ipmi: Rework sensors and fix boot count sensor
+
+Changes in rc1 (since 4.1.1):
+
+General:
+
+  * big OPAL API documentation updates
+    We now document around 19 OPAL calls. There's still ~100 left to doc
+    though :)
+  * skiboot can load FreeBSD kernel payload (thanks to Nathan Whitehorn)
+  * You can now run sparse by setting C=1 when building
+  * PSI: Revert the timeout for PSI link recovery to architected value
+    now 30mins (prev 15)
+  * cpuidle: Add validated metrics for idle states
+  * core/flash: Add flash API
+    OPAL_FLASH_(READ|WRITE|ERASE)
+  * capi: Dynamically calculate which CAPP port to use
+    no longer hardwired to PHB0
+  * vpd: Use slca parent-child relationship to create vpd tree
+  * opal: Do not overwrite same HMI event for multiple HMI errors.
+    Now Linux will get a HMI event for each HMI error
+  * HMI event v2 now includes information about checkstop
+  * HMI improvements, handle more conditions gracefully:
+
+    * TB residue error
+    * TFMR firmware control error
+    * TFMR parity
+    * TFMR HDEC parity error
+    * TFMR DEC parity error
+    * TFMR SPURR/PURR parity error
+    * TB residue and HDEC parity HMI errors on split core
+  * hostservices: Cache lids prior to first load request
+  * Warn when pollers are called with a lock held
+    and keep track of lock depth.
+
+    **NOTE:** This means we will get backtraces in skiboot msglog on FSP machines
+    This is a KNOWN ISSUE and is largely harmless.
+    There's still a couple that we haven't yet cleaned, these
+    messages can be thought of as a TODO list for developers.
+
+  * Don't run pollers in time_wait if lock held
+  * pci: Don't hang if we have only one CPU
+  * Detect recursive poller entry
+  * General cleanup
+  * Cleanup of opal.h so that we can have Linux and skiboot match
+  * add sparse annotations to opal.h
+  * Platform hooks for loading and preloading resources (LIDs)
+    This lays the groundwork for cutting 4-20 seconds off boot in a
+    future skiboot release.
+  * Fix potential race when clearing OCC interrupt status
+  * Add platform operation for reading sensors
+
+    * add support to read core and memory buffer temperatures
+
+Mambo/POWER8 Functional Simulator:
+
+  * Replace is_mambo_chip() with a better quirks mechanism.
+  * Don't hang if we only have one CPU and PCI.
+
+BMC systems:
+
+  * BMC can load payload from flash
+  * IPMI on BMC systems: graceful poweroff and reboot
+  * IPMI on BMC systems: watchdog timer support
+  * IPMI on BMC systems: PNOR locking
+  * Support for IPMI progress sensor
+  * IPMI boot count sensor
+  * capi: Rework microcode flash download and CAPP upload
+    load microcode on non-fsp systems
+  * NEW opal-prd userspace tool that handles PRD on non-FSP systems.
+    and OPAL PRD calls to support it.
+  * Improvements to opal-prd, libflash, and ipmi
+  * ECC support in libflash
+  * Load CAPI micro code, enabling CAPI on OpenPower systems.
+  * Dynamically calculate which CAPP port to use, don't hardcode to PHB0
+  * memboot flash backend
+
+POWER8
+
+  * add nx-842 coproc support
+
+FSP systems:
+
+  * Make abort() update sp attn area (like assert does)
+    On FSP systems this gives better error logs/dumps when abort() is hit
+  * FSP/LEDS: Many improvements and bug fixes
+  * LED support for FSP machines
+    Adds OPAL_LEDS_(GET|SET)_INDICATOR and device-tree bindings
+  * Refactor of fsp-rtc
+  * OCC loading fixes, including possible race condition where we would
+    fail to IPL.
+
+POWER7
+
+  * Fix unsupported return code of OPAL_(UN)REGISTER_DUMP_REGION on P7
+  * occ: Don't do bad XSCOMs on P7
+    The OCC interrupt register only exists on P8, accessing it on P7 causes
+    not only error logs but also causes PRD to eventually gard chips.
+  * cpu: Handle opal_reinit_cpus() more gracefully on P7
+    no longer generate error logs
+  * libflash updates for openpower
+  * misc code cleanup
+  * add nx-842 coproc support