Hi,
-----Original Message----- From: u-boot-bounces@lists.denx.de [mailto:u-boot-bounces@lists.denx.de] On Behalf Of Jan Kiszka Sent: Monday, November 10, 2014 6:56 PM To: Marc Zyngier Cc: u-boot@lists.denx.de Subject: Re: [U-Boot] ARM: PSCI 0.1 vs 0.2
On 2014-11-10 14:08, Marc Zyngier wrote:
On 10/11/14 12:51, Jan Kiszka wrote:
Hi Marc,
what is the motivation to expose a PSCI 0.1 interface in U-boot, instead of 0.2? Support for preexisting users of 0.1? The kernel seems to be happy with both, and I'm now wondering if we should actually add the legacy version to Jailhouse as well (I hope we can
avoid this).
The initial rational was simple: at the time this code was written, the 0.2 spec still in review, and nobody was implementing it. Supporting 0.1 was the only viable use-case.
Still studying the logic: Is it possible to provide both interfaces, and would it make sense?
Supporting both is very easy. Just output the 0.2 function numbers that actually make sense for 0.1 and have both compatible strings.
Ah, cool - parameters and return values of, say, CPU_ON/OFF are compatible across both versions?
Jan
--
We did send out some ARMv8 PSCI v0.2 u-boot patches, which can be seen here:
http://permalink.gmane.org/gmane.comp.boot-loaders.u-boot/194210
Regards, Bhupesh