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From: Peter Maydell <peter.maydell@linaro.org>
Date: Wed, 6 Apr 2016 20:27:48 +0100
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Subject: Re: [Qemu-devel] [PATCH 0/2] Add gpio_key and use it for ARM virt
	power button
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To: "Emilio G. Cota" <cota@braap.org>
Cc: Wei Huang <wei@redhat.com>, QEMU Developers <qemu-devel@nongnu.org>, "Huangpeng (Peter)" <peter.huangpeng@huawei.com>, qemu-arm <qemu-arm@nongnu.org>, Shannon Zhao <shannon.zhao@linaro.org>, Shannon Zhao <zhaoshenglong@huawei.com>

On 6 April 2016 at 18:50, Emilio G. Cota <cota@braap.org> wrote:
> I might be doing something wrong, but aarch64-softmmu @ master only works for me
> after reverting 94f02c5ea94 "ARM: Virt: Use gpio_key for power button". Bisect log
> appended.
>
> This is what I get when booting aarch64 as per [1]:
> $ aarch64-softmmu/qemu-system-aarch64 -machine virt -cpu cortex-a57 -machine type=virt \
>  -nographic -smp 1 -m 2048 -kernel img/aarch64/aarch64-linux-3.15rc2-buildroot.img  \
> --append "console=ttyAMA0"
>
> qemu-system-aarch64: Unknown device 'gpio-key' for default sysbus
> Aborted (core dumped)

Your tree isn't building right (this is a dependency bug in our
makefiles somewhere) -- it hasn't built the new object file
with the gpio-key device in it, which means a runtime failure
when the device can't be found. You should be able to fix this
by deleting the aarch64-softmmu/config-devices.mak file from
your build tree and then doing a rebuild.

(One day I may get round to figuring out what happens here.
The oddity is that it doesn't cause problems for an
incremental rebuild, only for a build after a 'make clean'.)

thanks
-- PMM