2 Oct
2018
2 Oct
'18
4 p.m.
The dwmmc controllers on rk3188 do not have idma support, so need to use the fifo-mode and it my tests they became confused and stopped working if the frequency was to high.
While I only tested in somewhat bigger steps, 32MHz for example hung the controller, while reducing it to 16MHz worked just fine and is reasonably fast to load a kernel from mmc.
Signed-off-by: Heiko Stuebner heiko@sntech.de Reviewed-by: Philipp Tomsich philipp.tomsich@theobroma-systems.com Acked-by: Philipp Tomsich philipp.tomsich@theobroma-systems.com
arch/arm/dts/rk3188-radxarock-u-boot.dtsi | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
Applied to u-boot-rockchip, thanks!