Hi Greg, Thank you for your suggestions; I did add the -mlong-calls to the platform Make.defs
-ARCHCFLAGS = -fno-builtin +ARCHCFLAGS = -fno-builtin -mlong-calls I tried it out, same issue. Let me know if you have other ideas; I wonder if anyone has done in-system programming like this before without a boot-loader? Thank you! -james On Mon, Dec 12, 2022 at 11:05 PM James Dougherty <jafr...@gmail.com> wrote: > Hi Greg, > > No,l I don't, the relevant extract from make V=1 is as below! > > arm-none-eabi-gcc" -- -fno-builtin -Wall -Wstrict-prototypes -Wshadow > -Wundef -fno-strict-aliasing -g -Os -mcpu=cortex-m7 -mthumb -mfpu=fpv5-d16 > -mfloat-abi=hard -I. > > I will test that out tomorrow... > > Thank you! > -James > > > On Mon, Dec 12, 2022 at 12:18 PM Gregory Nutt <spudan...@gmail.com> wrote: > >> Do you have the compiler option -mlong-calls selected? That is necessary >> in order to call from the FLASH address space (at 0xxx xxxx) to the SRAM >> address space (2xxx xxxx). >> >
