add selectable (but static) SFP Base-X support - #18
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(This replaces #13 because github closed my PR, and I don't know how to reopen it.)
This adds support for "downgrading" either of the SFP+ ports to SFP ports with a firmware update.
There are 3 places where the port type must be configured:
The way that this patch works is by having U-Boot inspect the RCW, and perform fixups for the retimer and devicetree to match what it finds.
This means that the RCW is the only difference between firmware images. SFP0TYPE and SFP1TYPE can be set in site.conf (or elsewhere) to either "10g" (the default) or "1g" to determine what RCW will be included. Compared to the previous PR, I removed support for 1g+1g, and also limited 10g+1g to have the rightmost port as 1g. The two removed modes did not work reliably for different reasons. (But can very likely be added with a different mechanism.)