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MSP430F5259: Custom bootloader project for IAR

Part Number: MSP430F5259
Other Parts Discussed in Thread: MSPBSL, , UNIFLASH, MSP-FET

Hello,

I am working on a medical device for a customer which has a requirement for firmware updates in the field by micro SD Card.  I already have the SD Card working with low level reads/writes in the application and I can port that code to the bootloader. 

I have two questions:

1.  Where can I find the project files and source for the bootloader that is already loaded in boot flash for this device?  I downloaded the "MSPBSL_CUSTOMBSL430  MSB bootloader for MSP430" from this page: https://www.ti.com/tool/MSPBSL, and I looked at the IAR projects contained in the download but there is nothing for the MSP430F5259.  My goal is to use that BSL as a starting point, remove the UART/I2C support and hook in the uSD drivers I already have working to the flash programming.  Can you please point me in the right direction?

2.  How is the bootloader flashed?  I am using the UniFlash tool with a TI MSP-FET for the application.

Thanks!