David Hendricks posted comments on this change.

Patch set 1:

I haven't gone thru this patch again (I suspect it's fine), but wanted to add response to your comment in 22020. The W25Q256FV is an example of a chip which supports:

Native 4BA instructions
Extended address register: 3BA commands used with a separate register to hold the most significant address byte.
4BA address mode: 3BA commands re-purposed to clock in 4 address bytes instead of 3.

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