Hi Jaehoon,
If card and host are supported DDR mode, then it can be used the DDR mode. This patch-set has dependency about beomho's patch-set. (Based-on u-boot-samsung repository)
http://patchwork.ozlabs.org/patch/331986/ http://patchwork.ozlabs.org/patch/331987/ http://patchwork.ozlabs.org/patch/331989/ http://patchwork.ozlabs.org/patch/331988/
It's result for loading image.
sdhci controller ->5260488 bytes read in 259 ms (19.4 MiB/s) dwmmc controller without DDR mode -> 5260488 bytes read in 202 ms (24.8 MiB/s) dwmmc controller with DDR mode -> 5260488 bytes read in 118 ms (42.5 MiB/s)
Download the 400M image with lthor. sdhci controller -> 59.4sec (Avg 6.95 MB/s) dwmmc controller without DDR mode -> 61.6sec (Avg 6.72MB/s) dwmmc controller with DDR mode -> 60.4sec (Avg 6.85MB/s)
With downloading we aren't observing time improvement for downloading the test image and flashing it, because of the time consuming crc32 calculation.
After applying the patch: http://patchwork.ozlabs.org/patch/335223/
The time itself reduces significantly to less than 20 seconds.
In spite of the above I've tested this patch set on Trats2, so
Tested-by: Lukasz Majewski l.majewski@samsung.com Acked-by: Lukasz Majewski l.majewski@samsung.com