Hi,
on the matter of getting u-boot work with the ADI Sidewinder Reference Platform, I found the previously posted patches and used them as starting point for my own patch set. The Sidewinder board works with this patch, including ECC (optional).
There is a minimum set of ifdefs in cpu/ixp/start.S and no board-specific low-level.S and thus no endless code-duplication. The SDRAM parameters are handled by configuration definitions. The ixp425.h and ixp465.h header files should be merged but that can follow in a different patch, possibly renaming the defines and fixing all board specific code. The new initialisation routine was also tested on an IXP425, it really works on both.
The npe_less_fw.patch allows to have NPE-C firmware and still use NPE-B. There is no need to load firmware to NPE-C if you are not going to use it.
This work was done for Erhardt+Leimer GmbH.
Note: I hope this can be merged, however, your description at http://www.denx.de/wiki/U-Boot/Patches makes me worry. I can only use Lotus Notes and that's a bit limited. No, I cannot use another MUA from here, really! If you can accept them at attachments (patches with description header, diff index and Signed-off-by line, I use quilt locallly).
Sincerly,
Hendrik Sattler
PS: please CC on answers as I am not subscribed.