On Tue, Jul 14, 2020 at 02:18:55PM +0200, Christoph Hellwig wrote: > The code handling non-coherent DMA depends on being able to remap code > as non-cached. But that can't be done without an MMU, so using this > option on NOMMU builds is broken. > > Signed-off-by: Christoph Hellwig <h...@lst.de> > --- > arch/sh/Kconfig | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig > index f8027eee08edae..337eb496c45a0a 100644 > --- a/arch/sh/Kconfig > +++ b/arch/sh/Kconfig > @@ -61,6 +61,7 @@ config SUPERH > select MAY_HAVE_SPARSE_IRQ > select MODULES_USE_ELF_RELA > select NEED_SG_DMA_LENGTH > + select NO_DMA if !MMU && !DMA_COHERENT > select NO_GENERIC_PCI_IOPORT_MAP if PCI > select OLD_SIGACTION > select OLD_SIGSUSPEND > @@ -135,7 +136,7 @@ config DMA_COHERENT > bool
This change broke SD card support on J2 because MMC_SPI spuriously depends on HAS_DMA. It looks like it can be fixed just by removing that dependency from drivers/mmc/host/Kconfig. Rich
