On Tue, 3 Jan 2023 at 15:59, Stefan Kalkowski <stefan.kalkow...@genode-labs.com> wrote: > > Hello Michael, > > > On Fri, Dec 30, 2022 at 02:49:25AM +0100, Michael Grunditz wrote: > > Hello > > > > I would like to know the requirements from u-boot in order to properly > > start genode. > > in general Genode's base-hw kernel can boot from different > environments that u-boot might provide. This depends on the platform resp. > board. The generic Cortex-A53 bootstrap code used by rpi3, i.MX8, and > allwinner64 assumes that u-boot started the kernel (or better: > bootstrap code) in the EL3, EL2, or EL1 mode, although the latter one > is not used as start mode by any of these boards if I remember > correctly. > The only requirement is that the ELF binary was setup correctly, that > all peripherals used (e.g. the UART) are accessible in this mode (e.g. > when switching from secure to normal world before). > OK. Good to know.
> Have you tried the following after loading the Genode system's uImage > to "load_addr": > > bootm start ${load_addr}; bootm loados; bootm go; > I think(!) I tried that. Gives me a crashdump from uboot. > I don't think this is a good idea, because probably u-boot does not > setup the EL2 mode properly here then. Although I'm not sure. To stay > safe, I would not try to eagerly degrade the privilege level. > Moreover, you won't be able to use the hypervisor functionality. > True. > > Do I understand you correctly that the UART in principle works in the > Genode bootstrap code, but not if you enforce u-boot to switch to EL1 > before? If this is the case, you probably have no baud-rate issue > here?! > Yea. I must have dreamt :-) _______________________________________________ Genode users mailing list users@lists.genode.org https://lists.genode.org/listinfo/users