Re: [PATCH 0/5] ARM: orion5x/dove/mv78xx0 multiplatform

Arnd Bergmann
2015-12-10T21:00:39Z

On Thursday 10 December 2015 20:03:18 Detlef Vollmann wrote:
> On 12/10/15 14:43, Arnd Bergmann wrote:
> > On Thursday 10 December 2015 14:18:11 Arnd Bergmann wrote:
> >> On Thursday 10 December 2015 13:56:05 Detlef Vollmann wrote:
>
> >>> The bad news:
> >>> My own config (which is massivly stripped down) produces a kernel
> >>> image that's more than 26K bigger than on v4.4-rc3 without any
> >>> added functionality.
> >>> The DNS-323 is extremly constrained in space (the whole system
> >>> including boot loader, kernel and filesystem has to fit into 8M flash).
> >>> Any ideas how I can get rid of this additional overhead?
> >>
> >> Can you send me your config file? I can have a look.
> >>
> >
> > I've done a quick check with an allnoconfig-like test and it seems that
> > CONFIG_OF is weighing in at around 86K here, with all the other options
> > it pulls in, comparing an allnoconfig kernel for DS-323 with one that
> > has CONFIG_OF enabled as well.
> >
> > The multiplatform kernel also enables CONFIG_OF unconditionally, but is
> > otherwise a little smaller than the mach-orion5x based one:
> >
> > text data bss dec hex filename
> > 942144 64112 17648 1023904 f9fa0 build/tmp/vmlinux-orion-allno
> > 1027516 54052 20824 1102392 10d238 build/tmp/vmlinux-multi-plus-orion
> > 1025320 66020 18744 1110084 10f044 build/tmp/vmlinux-orion-plus-of
> >
> > The diff below shows all the differences between orion-allno and
> > multi-plus-orion.
> How did you get the orion-allno config and how did you get it compiled?
> I tried to apply your changes to my config and compile it, but
> it started silentoldconfig which introduced back 'ARCH_MULTIPLATFORM'

The first and third row are without my patches, once they are applied,
ARCH_ORION becomes a sub-option of ARCH_MULTIPLATFORM.

Arnd