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by jkson
Tue Jan 23, 2018 5:35 pm
Forum: Device Tree
Topic: mmc1 SDIO clock changing
Replies: 7
Views: 4237

Re: mmc1 SDIO clock changing

Thank you very much! I've compiled kernel and tried it. Sd_overclock works for underclocking sdhost. And max-frequency even better! I was able to set sdio to 0,5 MHz, make diagnosis and take a big step in my project)
by jkson
Sun Jan 21, 2018 5:20 pm
Forum: Device Tree
Topic: mmc1 SDIO clock changing
Replies: 7
Views: 4237

Re: mmc1 SDIO clock changing

Thank you! I think you have many another things to do, this question is not so important for community, only for me. I will use primary SD interface, because mmc overlay works fine with it, and I can use it with 1-bit width and underclocking with minor changes: [email protected]:~ $ sudo cat /sys/kerne...
by jkson
Sun Jan 21, 2018 7:27 am
Forum: Device Tree
Topic: mmc1 SDIO clock changing
Replies: 7
Views: 4237

mmc1 SDIO clock changing

Hi! I've connected second SD card via SDIO 1-bit bus. Works well with sdio overlay. But, how I can change clock frequency for this interface? I want to make some diagnosis with my oscilloscope and need a clock lowest as possible. I've tried change the parameter sdio_overclock, but nothing was change...

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