Awesome Brennan, thanks for the info. That totally makes sense. I have updated the following pages to include this information:
https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139629543 https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139629542 Best, Anthony [image: photo] *Anthony Merlino* CTO & Co-founder, Verge Aero (609)-319-1399 On Sun, Jan 31, 2021 at 12:29 PM Brennan Ashton <bash...@brennanashton.com> wrote: > Looks like the inline images dropped try to attach them here. Otherwise > you can find them in "System Architecture" section of the Reference Manual. > > On Sun, Jan 31, 2021, 9:25 AM Brennan Ashton <bash...@brennanashton.com> > wrote: > >> Hey Anthony, >> The best place is usually just a GitHub ticket or here. The issue with >> CCM is that at least in some of the STM32F4 series it is directly attached >> to the D bus so the CPU absolutely cannot execute from it. Also why you >> cannot do things like DMA. This is not true for all CCM like the STM32F3. >> See they system architecture diagrams here for the two. >> >> >> >> >> >> --Brennan >> >> On Sun, Jan 31, 2021, 9:15 AM Anthony Merlino <anth...@vergeaero.com> >> wrote: >> >>> Hi all, >>> >>> I was just reading the documentation on Confluence regarding ELF >>> programs: >>> >>> https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139629543 >>> >>> Here is the relevant excerpt >>> >>> Most MCUs based on ARMv7-M family processors support some kind of Tightly >>> > Coupled Memory (TCM). These TCMs have somewhat different properties for >>> > specialized operations. The STM32 F4 supports similar Core Coupled >>> Memory >>> > (CCM). It is important to not that *you cannot execute programs from >>> CCM!* >>> > >>> >>> My question is - Is it just CCM that cannot be used when ELF loading is >>> enabled? Or is it all TCM? Also, does anyone have the technical >>> explanation >>> for why CCM results in hard-fault? >>> >>> Is there a place to raise this type of "issue" for documentation on >>> Confluence? >>> >>> Best, >>> Anthony >>> >>
