Booting Linux: SD card required or not ?

Hi guys,
sorry for this newbiest question (and sorry also if replicated, my
previous post disappeared...)
I wonder if I need a SD card to boot linux on a Qtek 9000 or not

In http://www.handhelds.org/moin/moin.cgi/UniversalHowtoInstallLinux
I can read:
"Prepare your device for running linux from ramdisk *and* from SD-CARD"

Seems that I need a SD card and to configure it....

But in http://gnulinux.biz/files/Universal/ramdisk/readme
I read: "Just copy all this files *either* to your SD card or on your
device. STart 'gnuharet.exe' and hit "RUN"."

Seems that no SD card is required...

What is the right understanding ?

Best regards to all of amazing linux xda developers !

-- 
Olivier Marce	                +33 1 69 63 41 67
R&I Department
Route de Nozay
F-91461 Marcoussis (France)