Adventures in OpenPower Firmware
Stewart Smith
https://linux.conf.au/schedule/30215/...
In mid 2014, IBM released the first POWER8 based systems with the new Free and Open Source OPAL
firmware. Since then, several members of the OpenPower foundation have produced
(or are currently producing) machines based on the POWER8 processor with
the OPAL firmware.
This talk will cover the POWER8 chip with an open source firmware stack and how it all fits together.
We will walk through all of the firmware components and what they do,
including the boot sequence from power being applied up to booting an
operating system.
We'll delve into:
the time before you have RAM
the time before you have thermal management
the time before you have PCI
runtime processor diagnostics and repair
the bootloader (and extending it)
building and flashing your own firmware
using a simulator instead
the firmware interface that Linux talks to
device tree and OPAL calls
fun in firmware QA and testing
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