On Fri, 6 Dec, 2019, 1:39 PM Jan Kiszka, <[email protected]> wrote:
> On 05.12.19 20:32, Mani Sadhasivam wrote: > > Hi Jan, > > > > On Thu, Dec 5, 2019 at 1:38 PM Jan Kiszka <[email protected] > > <mailto:[email protected]>> wrote: > > > > [re-adding the mailing list] > > > > On 05.12.19 09:07, Jan Kiszka wrote: > > > On 05.12.19 08:49, Mani Sadhasivam wrote: > > >> > > >> > > >> On Thu, Dec 5, 2019 at 1:09 PM Jan Kiszka <[email protected] > > <mailto:[email protected]> > > >> <mailto:[email protected] <mailto:[email protected]>>> > > wrote: > > >> > > >> On 05.12.19 08:14, Mani Sadhasivam wrote: > > >> > Hi Jan, > > >> > > > >> > On Thu, Dec 5, 2019 at 12:36 PM Jan Kiszka > > <[email protected] <mailto:[email protected]> > > >> <mailto:[email protected] <mailto:[email protected] > >> > > >> > <mailto:[email protected] > > <mailto:[email protected]> <mailto:[email protected] > > <mailto:[email protected]>>>> > > >> wrote: > > >> > > > >> > On 02.12.19 19:43, Manivannan Sadhasivam wrote: > > >> > > Hello, > > >> > > > > >> > > I can see that the Zephyr RTOS has been mentioned in > > the FAQ as > > >> > > one of the ported OS for non-root cells. > > >> > > > > >> > > Is there any reference code I can look into? > > >> > > > >> > There is x86 support for Zephyr as Jailhouse "inmate". > > Check out > > >> > zephyr/boards/x86/x86_jailhouse/doc/board.rst. If you > > run into > > >> trouble, > > >> > report to the communities. > > >> > > > >> > > > >> > Ah, just noticed that it got removed some time ago: > > >> > > > >> > > > https://github.com/zephyrproject-rtos/zephyr/commit/f3611fdd0c8ca54a9f19bc56a14b4a2fdadaffe3#diff-bb9445fa64739ef6a5a6b59d520deb07 > > >> > > > >> > > >> Too bad they didn't reach out... > > >> > > >> > But this could be helpful! > > >> > > > >> > > >> Partly. For ARM, you likely don't need so may changes, see > below. > > >> > > >> > > > >> > > > >> > We could probably also easily support ARM, but the last > > time this > > >> > question came up, there was still not A-core support in > > Zephyr > > >> which is > > >> > a precondition. > > >> > > > >> > > > >> > That's what I'm trying to do on IMX8M EVK in spare time. > > There is > > >> an ongoing > > >> > PR for adding Cortex-A support in Zephyr, so I'm planning to > > >> utilize that. > > >> > > >> That is good news. If you combine that with the device tree > > description > > >> for inmates, actually those for the Linux cells, you should > > be able to > > >> boot without code modifications. > > >> > > >> > > >> Don't we need MMU support in inmate? The current ARMv8 PR doesn't > > have the > > >> MMU support. > > > > > > Technically, we don't. Earlier versions of our demo inmates were > > running > > > without MMU as well, but as that implies running without caches as > > well, > > > we changed that. In any case, the inmate starts in reset state, > means > > > with MMU (and caches) off. > > > > > > > > > I got it working partially(not fully though). What would be the Flash and > > SRAM address would you recommend? The Flash start address should > > be 0x0 since that's the CPU default start address, how about SRAM? > > I didn't play with targets where SRAM was involved so far, but I could > imagine that it will be easiest to map it at a location where it would > appear physically in exclusive use as well. > I just got it working. FWIW, the wip commits are here: https://github.com/Mani-Sadhasivam/zephyr/commits/jailhouse There are couple of caveats though: 1. Zephyr places the vector table at the start/base address and the reset entry next to it. But jailhouse didn't seem to find the reset entry and it always tries to start from the base address. Is there any config option available for fixing this? Since the vector table size is fixed, it should be relatively simple to make it start from that address I believe. 2. Currently the GICv3 Rdist address is hardcoded for 2nd core but in ideal case we should find it based on MPIDR value as done in jailhouse inmate demo. I'm getting faults while trying to read MPIDR_EL1 system register, so need to debug it. Thanks, Mani > > Jan > > -- > Siemens AG, Corporate Technology, CT RDA IOT SES-DE > Corporate Competence Center Embedded Linux > -- You received this message because you are subscribed to the Google Groups "Jailhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/jailhouse-dev/CANBTL1XmekrVLi%2BAfTT7oM9tZjNUcOd-7TM8KeeEH6TLSd-b0A%40mail.gmail.com.
