Difference between revisions of "OpenPOWER Firmware"

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(→‎Components: rewrite into table and process sections; add info from Stewart Smith talk at LCA 2016)
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== See also ==
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* [[OpenBMC|OpenBMC]]
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* [[OpenPOWER|OpenPOWER]]
  
 
== External Links ==
 
== External Links ==

Revision as of 00:04, 22 February 2018

OpenPOWER Firmware is an open-source alternative to OpenFirmware and proprietary IBM firmware used on Power machines.[1] It is a general name for many separate pieces of software used to start recent Power Architecture chips made by IBM.[2]

OpenBMC is a separate project that creates firmware for the Baseboard Management Controller.

Components

Firmware Runtime Location Function
Self-Boot Engine (SBE) SBE core (on CPU chip)
  • initialises CPU core
  • loads Hostboot
Hostboot CPU core
  • loads Skiboot
  • inits DRAM (zeroing for ECC mem.), Processor Bus, Memory buffer
Skiboot CPU core
  • implements OpenPOWER Abstraction Layer (OPAL) for OS runtime services
  • setup PCIe, device tree, real time clock, NVlink, sensors
  • loads Petitboot, OCC
Petitboot CPU core
  • boot menu
  • loads operating system
On-Chip Controller (OCC) OCC core (on CPU chip)
  • thermal regulation on CPU chip

Process

  1. OpenBMC starts SBE
  2. SBE loads Hostboot
  3. Hostboot loads Skiboot
  4. Skiboot loads OCC, Petitboot
  5. Petitboot loads the operating system
  6. operating system talks to firmware through OPAL

References

  1. ↑ Kerr, Jeremy. OpenPOWER: building an open-source software stack from bare metal. LCA 2015 - video on YouTube
  2. ↑ Smith, Stewart. Adventures in OpenPOWER Firmware. LCA 2016 - video on YouTube

See also

External Links

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