Download 2.6.37 and rescueOS-initrd-0.5.4.img and then in terminal: flasher-3.5 -k 2.6.37 -n rescueOS-initrd-0.5.4.img -l -b"rootdelay root=/dev/ram0". While holding the u key, connect the N900 to your computer via USB and put the battery to phone. If all goes well charge the battery:
/rescueOS/charge21 then check parttions, rootfs..
But please don't tell me you can't or something until you make it on linux.