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Re:Booting embedded Linux in 0.37 seconds on an ARMv7-A CPU ... by OnACoffeeBreak on Thursday June 18, 2020 @07:53AM (#23562188)
https://www.jedec.org/sites/default/files/docs/JESD84-B451.p...

You can use http://bugmenot.com/view/jedec.org to get free-to-use credentials.

The section in point is "A.6.1Bus initialization".

I'd say that if your MMC works fine going full-speed out of the gate and the IC on the board supports this speed, then you unlikely to encounter any issues.

Re:Booting embedded Linux in 0.37 seconds on an ARMv7-A CPU ... by eerimoq on Thursday June 18, 2020 @08:15AM (#23562329)
Thank you very much. Very helpful answer. I'll continue to use 52 MHz until I encounter problems (if any).