[PATCH 1/2] powerpc/85xx: fix problem that prevents PHYS_64BIT from configurable

[Tabi Timur-B04825]

On Thu, Feb 16, 2012 at 7:27 PM, Kumar Gala <galak at kernel.crashing.org> wrote:

> For some of these platforms like P2041RDB, P3041DS, P3060QDS, P4080DS, & P5020DS only a 36-bit physical address map is supported by u-boot and the device tree.  This was a decision that was made to NOT support 32-bit address map for these boards and accept the performance implication of it to reduce the # of builds, etc.

Was this a Freescale internal decision, or is this a generic 85xx decision?

For the record, I'm in favor in leaving out support for 32-bit address
map in the upstream kernel, and having it be an option on the SDK
only.  However, in order to do that, we cannot have "select
PHYS_64BIT" in the Kconfigs.  It needs to be in the defconfigs
instead.  Putting it in the defconfig will eliminate the need to have
it in every Kconfig block, so I think that's an improvement.

Then the SDK can include a defconfig that does not have PHYS_64BIT
defined.  And the SDK can include 32-bit U-Boots and 32-bit device
trees for any board where Freescale determines there is a need.

I think Leo's patch simplifies things for everyone.

-- 
Timur Tabi
Linux kernel developer at Freescale