On 8/20/21 4:17 PM, Robin Murphy wrote:
> On 2021-08-20 14:19, Johan Jonker wrote:
>> 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:
>>>>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.
>
>> Signed-off-by: Johan Jonker <jbx6244@xxxxxxxxx>
>> ---
>> 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";
>>
