RE: [PATCH] powerpc/85xx: allow CONFIG_PHYS_64BIT to be selectable

-----Original Message-----
From: Tabi Timur-B04825
Sent: Friday, February 24, 2012 10:46 AM
To: Li Yang-R58472
Cc: Huang Changming-R66093; galak@kernel.crashing.org;
benh@kernel.crashing.org; Wood Scott-B07421; linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] powerpc/85xx: allow CONFIG_PHYS_64BIT to be
selectable
=20
Li Yang-R58472 wrote:
=20

quoted

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

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

Even though the user still need to know the addressing mode that u-boot is =
using.  It won't work if the addressing mode of u-boot and device tree are =
different.

- Leo