couple of days ago , i had a problem with u-boot , basically after flashing the combined image , maemo won't boot , the phone turns off after u-boot attempts to load the kernel , if no mmc was in.
later i discovered that this problem was with the combined image that i flashed , i don't know what is wrong exactly , i used the power kernel image v40 for the combined image
http://maemo.org/packages/package_in....6.28-maemo40/
extracted the zImage from the .deb and ran builder script .
the resulting image is 2 MB so it should be fine , and it gets flashed fine also..
well since the phone was useless , i had to reflash the kernel to the combined image using pr1.2 kernel .
it was hard to get the phone to flash , pressing u , while the usb cable is plugged in on reboot , did nothing , the phone still loaded u-boot .
after several tries , i got it to work , by removing the battery , plug in the usb cable while the battery is removed ,(yellow led flashes once) , press and hold u on the keyboard , put the battery back in .
the phone went into flashing mode , i flashed the new combined image and everything went fine.
i hope this helps somebody .
if someone got u-boot working using the power kernel image , please share how .