ADSP-BF707 uptade external flash with UART ( Uart bootloader )

Dear All, 

I am using the Winbond W25Q32 external flash for boot ADSP-BF707.

I can update the external flash using the JTAG connection and the ICE1000.

My Question; 

I want to update the external flash with UART. 
Is this possible?

Is there a "bootloader" you can share?

I found a bootloader (Blueboot). However, it does not support the BF707 series.

I'm waiting for your help.