base-hw Bootstrap implementation: 16.05 version vs. 17.02 version

[Vasan VS]

Hi Stefan,

Many thanks for the details and pointers. We will change this and see if we
are getting any changes in behaviour.

Regards

Vasan


On Fri, Apr 21, 2017 at 6:31 PM, Stefan Kalkowski <
stefan.kalkowski at ...1...> wrote:

> Hello,
>
> On 04/18/2017 12:42 PM, Vasan VS wrote:
> > Hi all,
> >
> > We are trying to build and run Genode on a custom board with iMX6
> > processor. As part of this process, we are trying to understand the
> > implementation of base-hw in the 17.02 version release.
> >
> > In trying to understand the implementation of base-hw in the 16.05
> > implementation and in the current 17.02 version, we find that the
> > bootstrap portion of the implementation is present in 17.02 source base
> > @ base-hw/src/bootstrap which is NOT present in 16.05 code base.
> >
> > We had a look at the detailed release notes of all the intermediate
> > releases between these two versions (16.05->16.08, 16.08->16.11,
> > 16.11->17.02) but we could not find any documentation of the changes
> > that has been done on this particular portion of base-hw between these
> > two releases.
> >
> > If we use the 16.05 version on our board, we get the "Kernel
> > initialized" message after init is started but on the 17.02 version, the
> > board is hanging and refusing to boot up after "Starting kernel"
> > message(from uboot).
> >
> > Can someone help us with the following:
> > a) Provide the details of the changes that has been done between the two
> > versions in the bootstrap portion
>
> I'm really sorry that we did not add a corresponding section in the last
> release notes. Actually, this was done by intention, because the
> bootstrap component[1] is part of a major restructuring of base-hw to
> run core/kernel as part of every protection domain[2] that is not yet
> complete. Anyway, now I think it would have been better to at least give
> some hints in the release notes.
>
> In principle, the bootstrap component is used to initialize the cpu
> cores, to setup core's page-table, and to execute any board specifics
> that need to be done before the MMU is enabled. Finally it enables the
> MMU and starts core. Moreover, all board specific things are encoded
> into bootstrap and not core. Instead bootstrap provides all necessary
> information, like available RAM to core in a generic way, via the so
> called Bootinfo.
>
> > b) Point us to any clues on why we are facing this hang problem after
> > the log service is initialized and while enabling the MMU and caches.
>
> As already mentioned, bootstrap initializes core's page-tables.
> Therefore, all available RAM and memory-mapped I/O registers used by
> core need to be stated within the board-specific Platform::Board
> constructor in the bootstrap component. The current release contains
> some intermediate state, where the corresponding file for your platform
> resides here:
>
>   repos/base-hw/src/bootstrap/spec/imx6/platform.cc
>
> Another, thing that changed recently is that we enabled multiprocessor
> support for the Wandboard, which is the i.MX6 board we are using. To be
> on the safe side, you can limit the numbers of cores in these files:
>
>   repos/base-hw/lib/mk/spec/imx6/*.mk
>
> Regards
> Stefan
>
> [1] https://github.com/genodelabs/genode/issues/2092
> [2] https://github.com/genodelabs/genode/issues/2091
>
> >
> > Thanks in advance,
> >
> > Vasan
> >
> >
> >
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>
> --
> Stefan Kalkowski
> Genode Labs
>
> https://github.com/skalk · http://genode.org/
>
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