Ah, it is STM32L476RET. So, that wouldn't be the problem, but I have to check the errata for this chip. It is 62 pages long =|
On Sun, Jun 21, 2020, at 19:50, Gregory Nutt wrote: > On 6/21/2020 4:36 PM, Gregory Nutt wrote: > > > >> I will consider this possibilities, thanks. > >> > >> What is driving me crazy is that it actually seems to be triggered by > >> the binary being bigger than 256KB (MCU has 512KB, dual bank). I > >> already had to use openocd from git since it would not flash the > >> image in that case. Now openocd flashes correctly. However, the bad > >> reset behavior also seems to happen in this case. I have the same > >> problem with optimization turned on but which increases binary size > >> above 256KB. > >> > >> I cannot think something in the code that would change in this case, > >> since banks are contiguous. Maybe some chip errata, I don't know. > > > > Yes, I do recall some issue with the F429's in this regard. There was > > an errata. I believe that there are some pins in the upper 256Kb bank > > that interfered with some other peripheral. DavidS would know better > > than I. I thought it effected USB? > > > > You never mention which part you are using (or perhaps wan't paying > > attention). You should check the errata. > > I think this is the errata I was thinking of. In the STM32F42xx and > STM32F43xx Errata sheet: > > 2.2.10 PA12 GPIO limitations > > Description > When PA12 is used as GPIO or alternate function in input or output > mode, the data read > from Flash memory can be corrupted. This behavior is observed only > when the following > conditions are met: > > • The device operates from a 2.7 to 3.6 V VDD power supply whatever > the temperature > range > • Flash memory Bank2 is used or the dual bank feature is enabled. > > Impacted products > • STM32F42xxI and STM32F43xxI part numbers > • STM32F42xxG and STM32F43xxG part numbers only when dual bank > feature is > enabled. > > Not impacted products > • STM32F42xxG and STM32F43xxG part numbers when dual bank feature is > disabled > • STM32F42xxE and STM32F43xxE part numbers. > > Workaround > PA12 must be left unconnected on the PCB (configured as push-pull > and held Low). You > can use all the other GPIOs and all alternate functions except for > the ones mapped on > PA12. Use the OTG_HS peripheral in full-speed mode instead of the > OTG_FS peripheral. > > This limitation is fixed in silicon starting from revision 3. > > Note that this has been fixed in current versions. > >
