Difference between revisions of "OpenPOWER Firmware"
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(Undo revision 1160, I didn't know about FSI) |
(clarify that on TalosII boards the FSI debugging interface is used to override the normal POWER9 boot sequence) |
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# SBE executes [[OTPROM|OTPROM]], which loads SEEPROM firmware into SBE PIBMEM | # SBE executes [[OTPROM|OTPROM]], which loads SEEPROM firmware into SBE PIBMEM | ||
# SBE executes SEEPROM firmware | # SBE executes SEEPROM firmware | ||
| − | # [[OpenBMC|OpenBMC]] | + | # [[OpenBMC|OpenBMC]] uses [[FSI|FSI]] interface to start SBE |
# [[Self-Boot Engine|SBE]] loads Hostboot | # [[Self-Boot Engine|SBE]] loads Hostboot | ||
# [[Hostboot|Hostboot]] loads Skiboot | # [[Hostboot|Hostboot]] loads Skiboot | ||
Revision as of 16:17, 30 July 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 | Executed on | Loaded from | Function |
|---|---|---|---|
| OTPROM | SBE core (on CPU chip) | eFuses |
|
| Self-Boot Engine (SBE) | SBE core (on CPU chip) | SEEPROM |
|
| Hostboot | CPU core | SPI Flash |
|
| Skiboot | CPU core |
| |
| Petitboot | CPU core |
| |
| On-Chip Controller (OCC) | OCC core (on CPU chip) |
|
Process
- SBE executes OTPROM, which loads SEEPROM firmware into SBE PIBMEM
- SBE executes SEEPROM firmware
- OpenBMC uses FSI interface to start SBE
- SBE loads Hostboot
- Hostboot loads Skiboot
- Skiboot loads OCC, Petitboot
- Petitboot loads the operating system
- operating system talks to firmware through OPAL
References
- ↑ Kerr, Jeremy. OpenPOWER: building an open-source software stack from bare metal. LCA 2015 - video on YouTube
- ↑ Smith, Stewart. Adventures in OpenPOWER Firmware. LCA 2016 - video on YouTube
