lingon
Posts: 157
Joined: Fri Aug 26, 2011 7:31 am

Increasing the EMMC2 frequency with vcmailbox for a EMMC module?

Tue May 12, 2020 8:37 pm

I have an EMMC module with a uSD-EMMC adapter: viewtopic.php?f=28&t=248157. On a Raspberry Pi 4 the EMMC module does not reach DDR50 speed. Would it be possible to read the EMMC2 frequency in use with vcmailbox and then set the frequency to twice the value to increase the speed to DDR50?

What is the correct syntax for the vcmailbox commands to achieve these two tasks?

Is the documentation on https://github.com/raspberrypi/firmware ... ace#clocks up to date?

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