TI E2E Community
MSP430 Ultra-Low Power 16-bit Microcontroller Forum
Disabling the bootstrap loader (BSL)
I am using a MSP430F5419A part in a security and safety critical application and I want to disable use of the bootstrap loader (BSL) as much as possible. I have set the SYSBSLOFF in the SYSBSLC register to prevent access by the application firmware. To disable external access, I planned to erase the BSL in the Flash, but I read a post on this forum that this was a bad idea.
Why is erasing the BSL not a good idea? I have erased it on one of my parts and see to be able to debug, program, etc. via Spi-by-Wire.
If you do not use BSL and do not want others to use BSL, erasing the BSL-Flash is not a bad idea.
A. KirchhoffWhy is erasing the BSL not a good idea? I have erased it on one of my parts and see to be able to debug, program, etc. via Spi-by-Wire.
BSL is a last-chance to revive an MSP that isn't responding to JTAG anymore. Or a convenient wy to do field updates without need for a FET.
Since the BSL is password-protected and a wrong password erases the MSP content, there is no need to disable it. At lesat not on the 5x family (and on older families, there was no way to disable/erase it anyway).
If you erase the BSL, well, the last chance is spoiled, but everyhting else will still work. As long as you don't break something (e.g. by flashing a software that causes a reset loop and blocks JTAG)
_____________________________________Before posting bug reports or ask for help, do at least quick scan over this article. It applies to any kind of problem reporting. On any forum. And/or look here.If you cannot discuss your problem in the public, feel free to start a private conversation: click on my name and then 'start conversation'. But please do so only if you really cannot do it in a public thread, as I usually read all threads. And I prefer to answer where others can profit from it (or contribute to it) too.
Got it. Thanks for your reply.
I agree the BSL is a nice backup in case something goes wrong after blowing the JTAG fuse, but good to know the two (SBW/JTAG) are unrelated.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.