Bootloader running from Flash

Hi,

Can anyone Please guide me for implementing SPI boot loader for XMC 1400 with external interface of SD card.Please help me in the Firmware prospective and process which i need to

follow for the entire implementation(I am working on XMC 1400 Dev. kit with controller XMC 1404-F064x0200).

Thanks & Regards,

M. Ramarao.