STM32F205RCTb system boot loader

[sangamesh]

Posted on February 18, 2015 at 10:52

Hi

We want to use USB DFU feature available in system bootloader for firmware upgradeController used: STM32F205RCTbHow to jump to bootloader from application(Running in Flash). what should be the Boot options (Boot 0 and Boot 1 positions in hardware)Please assist on thisAwaiting your replyThank youSangamesh

[Tesla DeLorean]

Posted on February 18, 2015 at 13:36

Covered this a lot of times

https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/Calling%20stm32429I-Eval%20Bootloader&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F&currentviews=33

https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Java/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Java/jumping%20to%20the%20bootloader%20via%20software%20does%20not%20permit%20dfu%20mode&FolderCTID=0x01200200770978C69A1141439FE559EB459D758000F9A0E3A95BA69146...

[sangamesh]

Posted on February 20, 2015 at 14:42

Hi clive

Thank you very much for the informationI have one doubt, what is Address for Ram signature in following snippet

 LDR     R0, =0x2000FFF0 ; Address for RAM signature

                LDR     R1, =0xDEADBEEF

                LDR     R2, [R0, #0]

                STR     R0, [R0, #0] ; Invalidate

                CMP     R2, R1

                BEQ     Reboot_Loader

                LDR     R1, =0xDEADDEAD

                CMP     R2, R1

                BEQ     Reboot_RAM

Is it any address in RAM, where we load 0xDEADBEEF value and compare in reset handler?Please clarify

[Tesla DeLorean]

Posted on February 20, 2015 at 18:32

As if it's not clearly stated, the RAM address is 0x2000FFF0

*((uint32_t *)0x2000FFF0) = 0xDEADBEEF; // Write the magic value Or pick, and consistently apply, a different address more appropriate to your chip/system.