Source: Hacker News
Article note: It's an excellent tale of a bug hunt.
I spent some time staring into device trees and specifically weird SD/MMC behavior at the U-Boot to Linux hand-off a few months ago on some Zynq boards... this totally tracks, though I haven't cracked the behavior I was seeing. In my case, the boards in question have sequenced regulators for 3v3, 1v9, 1v8, and 1v5 and some examples have other issues with the power sequence, so it's a great angle to look at. I should see if the behaviors are related.
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