On 19 Feb 2016, Arnd Bergmann wrote:
On Thursday 18 February 2016 11:02:33 Nicolas Pitre wrote:
quoted
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?
Here's a question:
Can we just get rid of PHYS_OFFSET???
If it's only used at boot for XIP systems, we could:
A) pass it in via an unused register like atags and DT
or
B) just assume that atags or DT is in RAM, so round down to the nearest section and assume that is the start of your RAM
If it is needed after initial boot, then on first boot we save what was passed in from the boot loader for later use.
Chris