Hi Dragan and Folker, On 2024-05-02 03:28, Dragan Simic wrote: > Hello Folker, > > On 2024-04-30 07:42, Folker Schwesinger wrote: >> On Sun Apr 28, 2024 at 2:36 PM CEST, Chukun Pan wrote: >>> [...] >>> +&sdhci { >>> + bus-width = <8>; >>> + max-frequency = <200000000>; >>> + mmc-hs200-1_8v; >> >> Out of curiosity, does this board also support HS400? From a very brief >> look this board seems quite similar to Rock 4 series boards, that do >> support HS400. > > In a word, no, unfortunately. In more detail, the Rockchip RK3566 > and RK3568 SoCs support the eMMC modes up to and including HS200, but > not the HS400 mode. The datasheet for RK3568 only mention HS200 mode, however, HS400 mode is working in U-Boot after adjusting tap number for transmit clock [1]. Linux may need similar adjustment to make HS400 mode work on RK3568. RK3566 that this board use only support HS200, as specified in datasheet. [1] https://source.denx.de/u-boot/u-boot/-/commit/5c053f3adc69eaf83645b5d44c6adbb2d49a3fa7 Regards, Jonas > >>> + non-removable; >>> + pinctrl-names = "default"; >>> + pinctrl-0 = <&emmc_bus8 &emmc_clk &emmc_cmd &emmc_datastrobe>; >>> + vmmc-supply = <&vcc_3v3>; >>> + vqmmc-supply = <&vcc_1v8>; >>> + status = "okay"; >>> +}; >>