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skiboot
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Firmware for OpenPower systems
https://github.com/open-power/skiboot
OPAL firmware (OpenPower Abstraction Layer) comes in several parts.
A simplified flow of what happens when the power button is pressed is:
1) The baseboard management controller (BMC) powers the system on.
2) The BMC selects the master chip and releases the self-boot engines (SBEs)
on the POWER8 chips, master last.
3) The BMC relinquishes control of the flexible service interface (FSI)
SCAN/SCOM engines.
4) The hostboot firmware IPLs the system. It initiates a secondary power-on
sequence through a digital power systems sweep (DPSS).
5) The hostboot firmware loads the OPAL image and moves all processors to
their execution starting points.
Here, the OPAL image is three parts:
1) skiboot (includes OPAL runtime services)
2) skiroot - the bootloader environment
a) kernel
b) initramfs (containing petitboot bootloader)
They may be all part of one payload or three separate images (depending on
platform).
The bootloader will kexec a host kernel (probably linux). The host OS can
make OPAL calls. A TODO item is to extensively document this API.
See doc/overview.txt for a more in depth overview of skiboot.
Hacking
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You will need a C compiler (gcc 4.8) for ppc64 (big endian).
You will need a POWER8 system that you can deploy new firmware to.
License
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See LICENSE
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