From: eLinux.org

Nand Flash256

Common 256megabit flash models:

Media:k9f5608u0a.pdf Samsung
Media:tc58256aft.pdf Toshiba
Media:tc58dvm82a1ft.pdf Toshiba
sdtnf-256 Sandisk(no datasheet but compatible)
sdtngahe0-256 Sandisk(no datasheet but compatible)

Hardware