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CCS/TMS320F28377D: How to use SCI BOOT1 ?

Part Number: TMS320F28377D
Other Parts Discussed in Thread: CONTROLSUITE

Tool/software: Code Composer Studio

I want to use SCI BOOT1 Mode with GPIO28 & 29. But I failed to boot load through SCI.

I use the "blinky_with_dcsm_cpu01" example project In TI controlSUITE to test. I did the following:

(1) In DCSM_Z1_ZoneSelectBlock.asm file, I uncommented the two .long words and change the value as 0xFFFF815A.

(2)In 2837xD_dcsm_lnk_cpu1.cmd,  I removed ", type = DSECT" as below:

(3) Then, I compile and load the program successfully by using an JTAG emulator. 

With operations above,I didn't boot load through SCI (GPIO28&29) successfully.

Did I miss some important points? Do I need to configure GPIO28&29 for SCI If I want to use SCI BOOT1 Mode? Do I need to write my BootLoader for SCI BOOT1 Mode?