Hi Sudeep, On Thu, Mar 14, 2024 at 02:59:20PM +0000, Sudeep Holla wrote: > On Thu, Mar 14, 2024 at 08:52:59AM -0600, Mathieu Poirier wrote: > > On Wed, Mar 13, 2024 at 05:17:56PM +0000, Abdellatif El Khlifi wrote: > > > Hi Mathieu, > > > > > > On Wed, Mar 13, 2024 at 10:25:32AM -0600, Mathieu Poirier wrote: > > > > On Tue, Mar 12, 2024 at 05:32:52PM +0000, Abdellatif El Khlifi wrote: > > > > > Hi Mathieu, > > > > > > > > > > On Tue, Mar 12, 2024 at 10:29:52AM -0600, Mathieu Poirier wrote: > > > > > > > This is an initial patchset for allowing to turn on and off the > > > > > > > remote processor. > > > > > > > The FW is already loaded before the Corstone-1000 SoC is powered > > > > > > > on and this > > > > > > > is done through the FPGA board bootloader in case of the FPGA > > > > > > > target. Or by the Corstone-1000 FVP model > > > > > > > (emulator). > > > > > > > > > > > > > >From the above I take it that booting with a preloaded firmware is > > > > > > >a > > > > > > scenario that needs to be supported and not just a temporary stage. > > > > > > > > > > The current status of the Corstone-1000 SoC requires that there is > > > > > a preloaded firmware for the external core. Preloading is done > > > > > externally > > > > > either through the FPGA bootloader or the emulator (FVP) before > > > > > powering > > > > > on the SoC. > > > > > > > > > > > > > Ok > > > > > > > > > Corstone-1000 will be upgraded in a way that the A core running Linux > > > > > is able > > > > > to share memory with the remote core and also being able to access > > > > > the remote > > > > > core memory so Linux can copy the firmware to. This HW changes are > > > > > still > > > > > This is why this patchset is relying on a preloaded firmware. And > > > > > it's the step 1 > > > > > of adding remoteproc support for Corstone. > > > > > > > > > > > > > Ok, so there is a HW problem where A core and M core can't see each > > > > other's > > > > memory, preventing the A core from copying the firmware image to the > > > > proper > > > > location. > > > > > > > > When the HW is fixed, will there be a need to support scenarios where > > > > the > > > > firmware image has been preloaded into memory? > > > > > > No, this scenario won't apply when we get the HW upgrade. No need for an > > > external entity anymore. The firmware(s) will all be files in the linux > > > filesystem. > > > > > > > Very well. I am willing to continue with this driver but it does so little > > that > > I wonder if it wouldn't simply be better to move forward with upstreaming > > when > > the HW is fixed. The choice is yours. > > > > I think Robin has raised few points that need clarification. I think it was > done as part of DT binding patch. I share those concerns and I wanted to > reaching to the same concerns by starting the questions I asked on corstone > device tree changes.
Please have a look at my answer to Robin with clarifications [1]. Apart from mapping the register area rather than using the reg property I'll also add the mboxes property as Krzysztof confirmed. [1]: https://lore.kernel.org/all/20240314134928.ga27...@e130802.arm.com/ Cheers, Abdellatif