Difference between revisions of "OpenPOWER Firmware"
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| Hostboot Bootloader (HBBL) | | Hostboot Bootloader (HBBL) | ||
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− | | SBE SEEPROM (on CPU chip) | + | | SBE [[SEEPROM|SEEPROM]] (on CPU chip) |
[https://git.raptorcs.com/git/talos-hostboot/tree/src/bootloader Source] | [https://git.raptorcs.com/git/talos-hostboot/tree/src/bootloader Source] | ||
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Revision as of 09:44, 30 June 2021
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 (on CPU module) |
|
Self-Boot Engine (SBE) firmware | SBE core (on CPU chip) | SBE SEEPROM (on CPU module) |
|
Hostboot Bootloader (HBBL) | CPU core | SBE SEEPROM (on CPU chip) |
|
Hostboot | CPU core | PNOR (SPI Flash) |
|
Skiboot | CPU core | PNOR (SPI Flash) |
|
Skiroot/Petitboot | CPU core | PNOR (SPI Flash) | |
OCC firmware | OCC core (on CPU chip) | PNOR (SPI Flash) | The On-Chip Controller (OCC) manages:
|
CME HCODE | CME cores (on CPU chip) | PNOR (SPI Flash) | The Core Management Engines (CME) are auxillary cores used for power management purposes. They are ultimately responsible to the OCC.
|
SGPE and PGPE HCODE | SGPE and PGPE cores (on CPU chip) | PNOR (SPI Flash) | General Purpose Engine (GPE) cores which assist, and are managed by, the OCC.
|
IOPPE HCODE | IOPPE cores (on CPU chip) | PNOR (SPI Flash) |
|
OpenBMC | BMC chip | BMC SPI Flash |
(This is not part of OpenPOWER firmware, but is mentioned to give a picture of the division of responsibilities. Not all POWER9 systems use a BMC; IBM systems use a FSP.)
|
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, Skiroot
- Petitboot application within Skiroot loads the operating system
- OS 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
See also
External Links
- OpenPOWER firmware source code on GitHub
- For a better understanding of OpenPOWER firmware and boot processes, see:
- Bug tracker for firmware issues specific to Raptor CS products: https://bugs.raptorengineering.com/