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Re: [Qemu-ppc] [Qemu-devel] [PATCH] PPC: E500: Generate device tree on r

From: Alexey Kardashevskiy
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH] PPC: E500: Generate device tree on reset
Date: Wed, 24 Jul 2013 12:58:22 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

On 07/23/2013 01:28 AM, Alexander Graf wrote:
> Today we generate the device tree once on machine initialization and then
> store the finalized blob in memory to reload it on reset.
> This is bad for 2 reasons. First we potentially waste a bunch of RAM for no
> good reason, as we have all information required to regenerate the device
> tree available anyways.
> The second reason is even more important. On machine init when we generate
> the device tree for the first time, we don't have all of the devices fully
> initialized yet. But the device tree needs to potentially walk devices to
> put information about them into the device tree.

Not fully initialized yet? They are not even created at the machine init
point as far as I can tell, and that was the reason to do for spapr what
you are trying to do for e500 :)


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