Howto write to flash from user space (II)

[bodhi at despammed.com]

I already read http://www.linux-mtd.infradead.org/
but I found no useful informations
How can I write directly into flash from an user space application ?
I am using a SA1110 with 16MB StrataFlash.
I tried using /dev/mem but I can only read and not write to flash.
I do not have any /dev/mtd* device in my /dev , why ?
Do I need to develop a driver ?
Please help me, with at least a useful link or better a sample.
TIA

(sorry for the broken thread, I've lost the original message)