Yes, I am. I have a limited knowledge of what uboot is, and I figured by asking here I would use my time more effectively (because the answers would be publicly visible to plenty of other people who lack understanding of this just like I do) than by looking up every little detail.

Plus, whatever I look up is PROBABLY going to be rather general UBoot documentation and less applicable to the N900 port, or at least for all I knew that was the case. I mean the way I'm reading the earlier posts, it seems like the MicroSD card needs to be formatted into a very specific partition arrangement (three different ones, I think, as I read it), only the last one of which contains the kernel. Since the command "run mmcboot" or "run noloboot" tells me nothing about the existence of other options, I figured it would be safer to ask. Yes, I knew that the big deal about uboot was that it was a good multibooting method that didn't involve reflashing the NAND for each OS switch - and I suspected that it was at least in principle applicable to however-many-kernels-you-can-fit-on-your-device. But no, that wasn't self apparent, not when I didn't see a single mention of using UBoot to put stuff on the internal memory, or frankly, anything else beyond a very formulaic way of putting it on an SD card (Yes, I get that formulaic instructions help people who don't know what they are doing - but when they are placed without comment, with the assumption that people who know better will know better and people who don't won't need to or will figure it out, it makes it indistinguishable from a suggestions that that's the only way to do it.)

Either way, thank you for answering.

- Edit -

Matan, are you sure the instructions give the right command "fiasco-flasher [parameters/arguments]"? My N900 only has a "flasher" command, and two "fiasco-[something]" commands that are obviously not the flasher.

To be sure, I checked some wiki pages, and I'm pretty confident the proper command is "flasher", not "fiasco-flasher".

- Edit 2 -

On that note, running "flasher -k my.u-boot.power41a -f" results in "Suitable USB device not found, waiting." Which leads me to be confused - wasn't the way the instructions were written suggesting that the commands are all run from the N900? (Presumably in the directory the image is stored in?) (And I tried running that but with "fiasco-" in front of flasher, but that just doesn't seem to exist as a command.)