On Wed, 2015-07-08 at 13:29 +1000, Samuel Mendoza-Jonas wrote: > Older big-endian ppc64 kernels don't include the FIXUP_ENDIAN check, > meaning if we kexec from a little-endian kernel the target kernel will > fail to boot. > Returning to big-endian before we enter the target kernel ensures that > the target kernel can boot whether or not it includes FIXUP_ENDIAN. > > Signed-off-by: Samuel Mendoza-Jonas <sam...@au1.ibm.com> > --- > V2: As suggested by Anton take advantage of the rfid call and switch off > MSR_LE and branch to the target kernel in the same step. > > kexec_trampoline.S | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) > > diff --git a/kexec_trampoline.S b/kexec_trampoline.S > index a3eb314..3751112 100644 > --- a/kexec_trampoline.S > +++ b/kexec_trampoline.S > @@ -88,8 +88,15 @@ start: > > li r5,0 > > - mtctr r4 > - bctr > + mtsrr0 r4 > + > + mfmsr r5 > + clrrdi r5,r5,1 /* Clear MSR_LE */ > + mtsrr1 r5 > + > + li r5,0 > + > + rfid
Is kexec-lite meant to be specific to book3s-64? The README just says "A simple kexec for flattened device tree platforms" and I see a __powerpc64__ ifdef in kexec_trampoline.S (but not in the above patch)... -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
