Difference between revisions of "OpenPOWER Firmware"
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(Add column indicating where each piece of firmware is loaded from (i.e. where it is stored when the system is powered down)) |
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| Line 7: | Line 7: | ||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
! Firmware | ! Firmware | ||
| − | ! | + | ! Executed on |
| + | ! Loaded from | ||
! Function | ! Function | ||
|- | |- | ||
| [[Self-Boot Engine|Self-Boot Engine]] (SBE) | | [[Self-Boot Engine|Self-Boot Engine]] (SBE) | ||
| SBE core (on CPU chip) | | SBE core (on CPU chip) | ||
| + | | SEEPROM | ||
| | | | ||
* initialises CPU core | * initialises CPU core | ||
| Line 18: | Line 20: | ||
| [[Hostboot|Hostboot]] | | [[Hostboot|Hostboot]] | ||
| CPU core | | CPU core | ||
| + | | SPI Flash | ||
| | | | ||
* loads Skiboot | * loads Skiboot | ||
| Line 24: | Line 27: | ||
| [[Skiboot|Skiboot]] | | [[Skiboot|Skiboot]] | ||
| CPU core | | CPU core | ||
| + | | | ||
| | | | ||
* implements [[OpenPOWER Abstraction Layer|OpenPOWER Abstraction Layer]] (OPAL) for OS runtime services | * implements [[OpenPOWER Abstraction Layer|OpenPOWER Abstraction Layer]] (OPAL) for OS runtime services | ||
| Line 31: | Line 35: | ||
| [[Petitboot|Petitboot]] | | [[Petitboot|Petitboot]] | ||
| CPU core | | CPU core | ||
| + | | | ||
| | | | ||
* boot menu | * boot menu | ||
| Line 37: | Line 42: | ||
| [[On-Chip Controller|On-Chip Controller]] (OCC) | | [[On-Chip Controller|On-Chip Controller]] (OCC) | ||
| OCC core (on CPU chip) | | OCC core (on CPU chip) | ||
| + | | | ||
| | | | ||
* thermal regulation on CPU chip | * thermal regulation on CPU chip | ||
Revision as of 16:39, 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 |
|---|---|---|---|
| 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
- OpenBMC starts 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
