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

On Thu, Feb 16, 2012 at 7:27 PM, Kumar Gala [off-list ref] wro=
te:

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 d=
evice tree. =A0This was a decision that was made to NOT support 32-bit addr=
ess map for these boards and accept the performance implication of it to re=
duce 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.

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