On 8/20/21 4:17 PM, Robin Murphy wrote:

On 2021-08-20 14:19, Johan Jonker wrote:

quoted

On the MK808 only a microSD slot is connected with the SDMMC Host
Controller,
so remove the cap-mmc-highspeed property from the &mmc0 node.

Why, does it do any harm? 

Harm not. Example rk3066 u-boot:

quoted

quoted

quoted

sd_select_mode_and_width

sd card: widths [4, 1, ] modes [MMC legacy, SD High Speed (50MHz), UHS
SDR12 (25MHz), UHS SDR25 (50MHz), ]
host: widths [4, 1, ] modes [MMC legacy, MMC High Speed (26MHz), SD
High Speed (50MHz), MMC High Speed (52MHz), ]
trying mode SD High Speed (50MHz) width 4 (at 50 MHz)

I would say only advertise host capabilities that are under normal
circumstances occur. How realistic is it to use a TF/Micro SD TO SD Card
Extension Cable Adapter (giggle) for a deprecated mmc card?

Johan

It's perfectly possible to connect a

full-sized card to a microSD slot with an adapter. I came across my old
SDIO WiFi card a while back and tried it that way for a giggle, but
unfortunately it turned out not to be a chipset supported by any
upstream driver.

Robin.

quoted

Signed-off-by: Johan Jonker <redacted>
---
  arch/arm/boot/dts/rk3066a-mk808.dts | 1 -
  1 file changed, 1 deletion(-)

diff --git a/arch/arm/boot/dts/rk3066a-mk808.dts

b/arch/arm/boot/dts/rk3066a-mk808.dts
index 9790bc63b..b67f5cb51 100644

--- a/arch/arm/boot/dts/rk3066a-mk808.dts
+++ b/arch/arm/boot/dts/rk3066a-mk808.dts

@@ -123,7 +123,6 @@

    &mmc0 {
      bus-width = <4>;
-    cap-mmc-highspeed;
      cap-sd-highspeed;
      vmmc-supply = <&vcc_sd>;
      status = "okay";