# \[PATCH 4/9\] ARM: add CONFIG\_PHYS\_OFFSET default values

- From: Nicolas Pitre \<hidden\>
- Date: 2016-02-19 16:10:27 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2016/02/4689483
- Thread: https://ratatoskr.run/linux-arm-kernel/2016/02/8730107/t.md

```text
On Fri, 19 Feb 2016, Arnd Bergmann wrote:

> On Thursday 18 February 2016 11:02:33 Nicolas Pitre wrote:
> > 
> > Acked-by: Nicolas Pitre <redacted>
> > 
> > Is there a way to provide a default for defaults?
> 
> We could have something like
> 
> config PHYS_OFFSET_0
> 	bool
> 
> config PHYS_OFFSET_1
> 	bool
> 
> config PHYS_OFFSET_2
> 	bool
> 
> ... (we need 8 of the 16 possible addresses)
> 
> 
> config PHYS_OFFSET
> 	hex "Physical address of main memory" if MMU
> 	default DRAM_BASE if !MMU
> 	default 0x00000000 if PHYS_OFFSET_0
> 	default 0x10000000 if PHYS_OFFSET_1
> 	default 0x20000000 if PHYS_OFFSET_2
> 	default 0x30000000 if PHYS_OFFSET_3
> 	default 0x70000000 if PHYS_OFFSET_7
> 	default 0x80000000 if PHYS_OFFSET_8
> 	default 0xa0000000 if PHYS_OFFSET_A
> 	default 0xc0000000 if PHYS_OFFSET_C
> 
> 
> and then select one of the bool symbols from each platform.
> Would that address your question?

Yes, but the ugliness factor isn't worth it IMHO.

I was wondering if something like this was possible:

config PHYS_OFFSET
        hex "Physical address of main memory" if MMU
        default DRAM_BASE if !MMU
        default 0x10000000 if FOO
        default 0x20000000 if BAR
        default 0x30000000 if BAZ
        default 0x00000000


Nicolas
```