Hi Ilias, On Fri, Nov 24, 2023 at 10:50 PM Ilias Apalodimas <ilias.apalodi...@linaro.org> wrote: > > Hi Shantur > > On Fri, 24 Nov 2023 at 18:51, Shantur Rathore <i...@shantur.com> wrote: > > > > Hi Heinrich, > > > > I am trying to work out how to enable the SetVariableRT service in > > U-Boot and came across your patch [1] which initially had the > > SetVariable RT service enabled in EFI but in the final patch this was > > removed. > > I am hoping to implement it on top of the SPI Flash EFI store [2] to > > be able to set Boot order and boot items from Linux the UEFI way. > > > > Can I pick your brain on why it was dropped in the patch? > > Is there any limitation in SetVariableRT service ? > > I recently had a talk about it in Plumbers [0]. Generally speaking, RT > + hardware owned by the kernel is a very weird combination since you > can't guarantee exclusive access to the flash or the bus and you have > to preserve a *lot* of code alive in u-boot. > > I'll respond to your v1 patchset and we can discuss details there as well. > > [0] https://lpc.events/event/17/contributions/1653/
Thanks for the background and helping me understand the problem. Makes me wonder how things work in the PC world. U-boot being only ~1MB, can we not leave it all in memory and maybe just disable SPI access to Linux. I might be talking rubbish, just thinking what weird ways it can be worked. Regards, Shantur