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SubjectRe: [RFC PATCH 02/17] powerpc: Split up PHYS_64BIT config option to fix "select" issues
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Benjamin Herrenschmidt wrote:

> For PHYS_64BIT, I'm not 100% certain at this point what the best
> approach it. It should clearly be fixed and hidden for real 64-bit. As
> for the rest, should it be user selectable ?

I have been unable to convince our BSP teams that the minor performance
improvement of a 32-bit kernel vs 36-bit is not worth the hassle. We ship
a lot of lower-end e500 systems that will never have more than 2GB of memory.

The P1022DS is an example. We ship 32-bit and 36-bit versions of U-Boot,
the kernel, and the device tree. I recently added code to U-boot to
detect if you have a mismatched U-Boot and device tree, because it is so
easy to mess that up. I would like nothing more than to abandon 32-bit
for all e500, but I don't see Freescale allowing that any time soon.

--
Timur Tabi
Linux kernel developer at Freescale


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