Michael Ellerman [off-list ref] a écrit :

Christophe Leroy [off-list ref] writes:

quoted

When not using large TLBs, the IMMR region is still
mapped as a whole block in the FIXMAP area.

Do not remove pages mapped in the FIXMAP region when
initialising paging.

Properly report that the IMMR region is block-mapped even
when not using large TLBs.

Signed-off-by: Christophe Leroy <redacted>
---
 arch/powerpc/mm/mem.c        |  8 --------
 arch/powerpc/mm/nohash/8xx.c | 13 +++++++------
 2 files changed, 7 insertions(+), 14 deletions(-)

This blows up pmac32_defconfig + qemu mac99 for me with:

Ok, then there is still something I have not understood about fixmap.  
I'll look at it next week

Christophe