OK:

Here the text (in English) to know how that to do so that microSD does boot, which depends completely on U-boot

The link Obtained of post in this site (I do not remember what). Thanks to the author.


"Afterwards, add a third partition after the others. Format as FAT. Convert the MeeGo kernel to a uImage like this:

mkimage -A arm -O linux -T kernel -C none -a 80008000 -e 80008000 -n vmlinuz-2.6.35.3-5.2-n900 -d vmlinuz-2.6.35.3-5.2-n900 uImage

Copy the resulting uImage to the root of the new FAT partition. Put SD card in N900.
Turn on. It will boot MeeGo fully automatically.
"


Note:

for that commando one is due to install as it follows:

sudo apt-get install uboot-mkimage





Esp...

En pocas palabras, crear otra particion FAT32 en la microSD (lo hice con Gparted) despues de las otras que se generaron. Correr el comando descrito y el resultado llamado "uImage" copiarlo en la particion creada.