On 2014-12-29 15:12, Ian Campbell wrote:
On Mon, 2014-12-15 at 12:37 +0100, Jan Kiszka wrote:
This extends the PSCI support for the A20 to a dual v0.2 and v0.1 interface. Recent OSes will prefer v0.2, olders will still find the original interface, just at v0.2 service IDs.
In addition to the existing services, v0.2 requires us to implement both system off and reset. At least Linux will make use of them in favor of its own implementations and, thus, fail if they do not work.
What functionality does v0.2 give us over v0.1 that you are aiming to expose here?
For us, the added value is currently in next layer: we can simplify the Jailhouse hypervisor a bit when leaving out v0.1 support right from the beginning. But that means U-Boot has to support v0.2 on the platforms we target at.
v0.2 is the current standard, so I would expect new boards to use that one in the future by default. Thus, this lays the ground, though there will surely be more work required to make some code better reusable.
Jan