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From: Tabi Timur-B04825 <B04825@freescale.com>
To: Li Yang-R58472 <r58472@freescale.com>
Subject: Re: [PATCH] powerpc/85xx: allow CONFIG_PHYS_64BIT to be selectable
Date: Fri, 24 Feb 2012 02:45:36 +0000
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Cc: "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>,
 Huang Changming-R66093 <r66093@freescale.com>,
 Wood Scott-B07421 <B07421@freescale.com>
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Li Yang-R58472 wrote:

> I agree with Changming that we shouldn't setting PHYS_64BIT by default.

The default kernel should always be the compatible with as much as=20
possible.  Disabling PHYS_64BIT by default means that the default kernel=20
will not work with a 36-bit DTS.  If you attempt to boot such a kernel=20
with a 36-bit DTS, there will be no text output.  Most people will not=20
know why it's not working.

So the safest option is for PHYS_64BIT to be enabled by default.  That=20
way, the kernel will always work.

--=20
Timur Tabi
Linux kernel developer at Freescale=