Dear Goetz,
Sorry I write in english it's more easy for me. I am desapered my Syno DS209 is looked.
Also i have connected it via serial interface and Uboot and Tftp server to re load flash memory with the last original zImage and rd.bin.
My only problem, is I don't know the flash memory layout (flash is M25P32) for erasing memory.
I have trying whith your layout :
0xf8080000-0xf827ffff : "zImage"
0xf8280000-0xf83bffff : "rd.gz"
see my commands:
tftpboot 0ax3000000 zImage <>>> load image in free zone
erase 0xf8080000 0xf827ffff >> erase 32 sectors
cp.b 0ax3000000 8080000 827ffff >>> nothing only prompt after 10 secondes
tftpboot 0x3000000 rd.bin
erase 0xf8280000 0xf83bffff >>> 20 sectors erased
cp.b 0ax3000000 8280000 83bffff >>> nothing only prompt after 10 secondes
protect on all
reset >>>>>
but when I reset I have message "## Booting image at f8080000 ...
Bad Magic Number
I think you know very well, you are my only chance...
Thank you very much.