Re: [PATCH 02/16] arm: qemu: Explain how to extract the generate devicetree

[Tom Rini]

On Wed, Oct 13, 2021 at 10:58:31AM -0600, Simon Glass wrote:
> Hi François,
> 
> On Tue, 12 Oct 2021 at 19:20, François Ozog <francois.ozog@linaro.org> wrote:
> >
> >
> >
> > Le mer. 13 oct. 2021 à 03:02, Simon Glass <sjg@chromium.org> a écrit :
> >>
> >> QEMU currently generates a devicetree for use with U-Boot. Explain how to
> >> obtain it.
> >>
> >> Signed-off-by: Simon Glass <sjg@chromium.org>
> >> ---
> >>
> >>  doc/board/emulation/qemu-arm.rst | 12 ++++++++++++
> >>  1 file changed, 12 insertions(+)
> >>
> >> diff --git a/doc/board/emulation/qemu-arm.rst 
> >> b/doc/board/emulation/qemu-arm.rst
> >> index 97b6ec64905..b458a398c69 100644
> >> --- a/doc/board/emulation/qemu-arm.rst
> >> +++ b/doc/board/emulation/qemu-arm.rst
> >> @@ -91,3 +91,15 @@ The debug UART on the ARM virt board uses these 
> >> settings::
> >>      CONFIG_DEBUG_UART_PL010=y
> >>      CONFIG_DEBUG_UART_BASE=0x9000000
> >>      CONFIG_DEBUG_UART_CLOCK=0
> >> +
> >> +Obtaining the QEMU devicetree
> >> +-----------------------------
> >> +
> >> +QEMU generates its own devicetree to pass to U-Boot and does this by 
> >> default.
> >> +You can use `-dtb u-boot.dtb` to force QEMU to use U-Boot's in-tree 
> >> version.
> >
> > this is for either Qemu experts or u-boot for Qemu maintainers. Not for the 
> > kernel développer as it is recipe for problems: could you add this warning ?
> 
> Yes I can do that...or would it be better to hide this in doc/develop
> somewhere with a link here?

Somewhere under doc/develop and an external link to the QEMU
documentation on dumpdtb would be good, as it's (as you demonstrate
throughout this series) a generic feature.

-- 
Tom

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