On Mon, Aug 31, 2015 at 09:19:26PM +1000, Michael Ellerman wrote: > On Mon, 2015-08-31 at 15:53 +0800, Boqun Feng wrote: > > On Mon, Aug 31, 2015 at 04:52:38PM +1000, Benjamin Herrenschmidt wrote: > > > On Mon, 2015-08-31 at 14:44 +0800, Boqun Feng wrote: > > > > Hi all, > > > > > > > > I hit a strange build error on v4.2, when I try to build a LE kernel > > > > with a slightly modification of the ppc64_defconfig. What I did is just > > > > make ppc64_defconfig and make menuconfig to set CPU_LITTLE_ENDIAN=y, and > > > > then build the kernel. > > > > > > > > I did a little research myself, and found out the error is because of > > > > trying to build a LE kernel with CONFIG_PPC_PS3=y. So a simple way to > > > > reproduce is: > > > > > > First, LE isn't supported on PS/3 :-) It's only supported on POWER8 > > > machines (and *some* P7 machines and only when running as KVM guest). > > > > Got it, thank you ;-) > > > > So should we modify Kconfigs of all the platform to reflect this? > > Yes. Maybe something like this? > > diff --git a/arch/powerpc/platforms/Kconfig.cputype > b/arch/powerpc/platforms/Kconfig.cputype > index c140e94..c359f72 100644 > --- a/arch/powerpc/platforms/Kconfig.cputype > +++ b/arch/powerpc/platforms/Kconfig.cputype > @@ -415,9 +415,13 @@ config VDSO32 > big endian. That is because the only little endian configuration we > support is ppc64le which is 64-bit only. > > +config CHOOSE_ENDIAN > + bool > + > choice > prompt "Endianness selection" > default CPU_BIG_ENDIAN > + depends on CHOOSE_ENDIAN > help > This option selects whether a big endian or little endian kernel > will > be built. > diff --git a/arch/powerpc/platforms/powernv/Kconfig > b/arch/powerpc/platforms/powernv/Kconfig > index 604190c..32d5661 100644 > --- a/arch/powerpc/platforms/powernv/Kconfig > +++ b/arch/powerpc/platforms/powernv/Kconfig > @@ -18,6 +18,7 @@ config PPC_POWERNV > select CPU_FREQ_GOV_ONDEMAND > select CPU_FREQ_GOV_CONSERVATIVE > select PPC_DOORBELL > + select CHOOSE_ENDIAN
IIUC, we can actually set PPC_POWERNV=y and PPC_PS3=y at the same time, right? So this can't prevent PPC_PS3 && CPU_LITTLE_ENDIAN from being true. > default y > > config OPAL_PRD > diff --git a/arch/powerpc/platforms/pseries/Kconfig > b/arch/powerpc/platforms/pseries/Kconfig > index 54c87d5..182f485 100644 > --- a/arch/powerpc/platforms/pseries/Kconfig > +++ b/arch/powerpc/platforms/pseries/Kconfig > @@ -21,6 +21,7 @@ config PPC_PSERIES > select HOTPLUG_CPU if SMP > select ARCH_RANDOM > select PPC_DOORBELL > + select CHOOSE_ENDIAN > default y > > config PPC_SPLPAR > > > > > > But the specific problem you are having looks like a differnet issue > > > with the PS3 boot wrapper. > > > > > > > But could the reason of this be that the building process of the PS3 > > boot wrapper assumes the kernel is BE? > > It looks more like we're getting confused between 32-bit and 64-bit, from your > log: > > ld: powerpc:common64 architecture of input file > `arch/powerpc/boot/ps3-head.o' is incompatible with powerpc:common output > > Which says it has a .o which is 64-bit but it's trying to produce 32-bit > output. > > That's probably related to the PPC64_BOOT_WRAPPER stuff. Probably, and just FYI, I build a 64bit BE kernel, the dtbImage.ps3 is ELF 32-bit MSB executable. Regards, Boqun
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