On 24/03/2020 23:58, Jaehoon Chung wrote:
> Enable SDHCI_SDMA configuration.
> 
> Signed-off-by: Jaehoon Chung <jh80.ch...@samsung.com>
> Reviewed-by: Peng Fan <peng....@nxp.com>
> Reviewed-by: Minkyu Kang <mk7.k...@samsung.com>
> ---
>  configs/rpi_4_32b_defconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/configs/rpi_4_32b_defconfig b/configs/rpi_4_32b_defconfig
> index 72cda5d949..7189914606 100644
> --- a/configs/rpi_4_32b_defconfig
> +++ b/configs/rpi_4_32b_defconfig
> @@ -25,6 +25,7 @@ CONFIG_DFU_MMC=y
>  CONFIG_DM_KEYBOARD=y
>  CONFIG_DM_MMC=y
>  CONFIG_MMC_SDHCI=y
> +CONFIG_MMC_SDHCI_SDMA=y

RPi4 can only do DMA transfers to the first GiB of memory. I wasn't sucessfull
in understanding the mmc/sdhci code to see where we take the dma-ranges property
into account so that we don't use an address > 1 GiB.

Are we safe in this regard? If we are, then we can also enable this for
rpi_4_defconfig and rpi_arm64_defconfig I think.

Regards,
Matthias

>  CONFIG_MMC_SDHCI_BCM2835=y
>  CONFIG_DM_ETH=y
>  CONFIG_BCMGENET=y
> 

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