What is the difference between ARCH_XXX MACH_XXX TARGET_XXX macros

[Tom Rini]

On Wed, Dec 04, 2019 at 05:49:09PM +0800, Tim Williams wrote:

> Hello, I am trying to port u-boot to a new board,
> 
> There are several macros, how to use them properly?
> 
>  CONFIG_ARCH_XXX
>  CONFIG_MACH_XXX
>  CONFIG_TARGET_XXX
> 
> for example, my board has:
> 
>   SoC: LS2K1000
>   ISA: MIPS32r1, MIPS32r2, MIPS64r1, MIPS64r2
> Board: UselessRouter or HelloRouter, TBD
>   NIC: 4 1000Mbps NIC(No built in switcher)

Code that is generic to LS2K1000 but not your boards should use
CONFIG_SOC_xxx and everything board-specific should be
CONFIG_TARGET_xxx.  CONFIG_ARCH_xxx / CONFIG_MACH_xxx should get used
likely sparingly, but we are indeed inconsistent and could use
CONFIG_SOC_xxx in some of those cases.

-- 
Tom
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