On Mon, Jan 16, 2017 at 09:47:06AM +0000, André Przywara wrote: > On 16/01/17 08:55, Maxime Ripard wrote: > > On Fri, Jan 13, 2017 at 09:42:28AM +0000, Andre Przywara wrote: > >>> Re wanting to build SPL either as 32-bit or 64-bit, could this be a > >>> Kconfig option perhaps? > >> > >> Sounds like a direction worth to investigate. > >> In the moment we have two separate defconfig files, because CPU_V7 and > >> ARM64 are actually mutually exclusive, which is really a pain and the > >> main reason that part wasn't merged. > > > > I really like that option. > > So I gave this a try this weekend, I have something like: > > +choice > + prompt "32/64 bit build selection" > + depends on MACH_SUN50I > + > +config SUNXI_64BIT_BUILD > + bool "64-bit Aarch64 build" > + select ARM64 > + > +config SUNXI_32BIT_BUILD > + bool "32-bit ARM build" > + select CPU_V7 > + select PHYS_64BIT > + > +endchoice > > I then set CONFIG_SUNXI_64BIT_BUILD=y in the defconfig. > That seems to work, however switching to a 32-bit build requires either > a) a separate defconfig - which is what we didn't want > b) manually toggling this via menuconfig > c) sed-ing these two lines in .config > > I was hoping that there was some simple command line way of toggling a > Kconfig option, à la: > $ make pine64_plus_defconfig CONFIG_SUNXI_32BIT_BUILD=y > > But that didn't work. > mergeconfig.sh wasn't helpful as well. > > Any ideas on how we could easily switch between the two options?
I know that Linux has a way to append defconfig fragments (originally for android options iirc). That could be worth a look. Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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