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

[Li Yang-R58472]

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