On Tue, Jun 11, 2019 at 05:20:12PM -0500, Larry Finger wrote: > Your first patch did not work as the configuration does not have > CONFIG_ZONE_DMA. As a result, the initial value of min_mask always starts > at 32 bits and is taken down to 31 with the maximum pfn minimization. When > I forced the initial value of min_mask to 30 bits, the device worked. Ooops, yes. But I think we could just enable ZONE_DMA on 32-bit powerpc. Crude enablement hack below: diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 8c1c636308c8..1dd71a98b70c 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -372,7 +372,7 @@ config PPC_ADV_DEBUG_DAC_RANGE config ZONE_DMA bool - default y if PPC_BOOK3E_64 + default y config PGTABLE_LEVELS int
