RTT broken on STM32 Blue pill
simonsunnyboy opened this issue · comments
I tried building the STM32 Blue pill target with current main branch of today.
$ make PROBE_HOST=swlink ENABLE_RTT=1
This builds but exceeds the 128K FLASH available and thus cannot be flashed in the end:
` LD blackmagic.elf
Memory region Used Size Region Size %age Used
rom: 134788 B 128 KB 102.84%
ram: 13636 B 20 KB 66.58%
/usr/lib/gcc/arm-none-eabi/9.2.1/../../../arm-none-eabi/bin/ld: address 0x8020ce0 of blackmagic.elf section .text' is not within region rom'
/usr/lib/gcc/arm-none-eabi/9.2.1/../../../arm-none-eabi/bin/ld: blackmagic.elf section .ARM.exidx' will not fit in region rom'
/usr/lib/gcc/arm-none-eabi/9.2.1/../../../arm-none-eabi/bin/ld: address 0x8020ce0 of blackmagic.elf section .text' is not within region rom'
/usr/lib/gcc/arm-none-eabi/9.2.1/../../../arm-none-eabi/bin/ld: region rom' overflowed by 3716 bytes collect2: error: ld returned 1 exit status make[1]: *** [Makefile:133: blackmagic.elf] Fehler 1 make: *** [Makefile:17: all] Fehler 2
If I omit the ENABLE_RTT flag the build is working however I cannot use RTT then.
You can work around this by removing some of the targets from the Makefile, look at the lines following "SRC =" and delete any targets you do not need right now.
We are aware of this problem, as this duplicates issue #1579.
Please note that building with GCC 9 is unsupported now, as is using your distro's toolchain due to issues with miscompilation and you should upgrade your compiler to ARM's GNU toolchain version 12.2.Rel1. The upgraded compiler does much better on code generation and optimisation, which helps alleviate this problem somewhat. More details are available on the linked issue.
You can work around this by removing some of the targets from the Makefile, look at the lines following "SRC =" and delete any targets you do not need right now.
If that means removing support for NXP or vendors different than ST, this looks like a short-term solution. I will try that.
We are aware of this problem, as this duplicates issue #1579.
Please note that building with GCC 9 is unsupported now, as is using your distro's toolchain due to issues with miscompilation and you should upgrade your compiler to ARM's GNU toolchain version 12.2.Rel1. The upgraded compiler does much better on code generation and optimisation, which helps alleviate this problem somewhat. More details are available on the linked issue.
Update of toolchain is noted but of no concern for me as only the BMP is affected.
I could work around by building the hosted variant which allows me to have working RTT support as a stop-gap even if it not on the probe itself.