The moderm kernel on powernv platform cannot possibly boot with values less than 12 as the default DMA window of 2GB requires (2<<30)/4096 TCEs which is 4MB of contiguous memory, log2(4M) == 22 so anything less than 12 won't work.
Signed-off-by: Alexey Kardashevskiy <[email protected]> --- I am hitting this when switching the system page size from 64K to 4K and back. When I switch to 64K, zone order is set to 9 by default and it does not change when I switch to 4K as 9 is still within the limits. And there are other folks complaining about this too. --- arch/powerpc/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 927d2ab..3516f16 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -637,7 +637,7 @@ config FORCE_MAX_ZONEORDER int "Maximum zone order" range 8 9 if PPC64 && PPC_64K_PAGES default "9" if PPC64 && PPC_64K_PAGES - range 9 13 if PPC64 && !PPC_64K_PAGES + range 12 13 if PPC64 && !PPC_64K_PAGES default "13" if PPC64 && !PPC_64K_PAGES range 9 64 if PPC32 && PPC_16K_PAGES default "9" if PPC32 && PPC_16K_PAGES -- 2.5.0.rc3
