Hello everyone, today I got the linker message "...bss will not fit in region ram .....ram overlflowed by 912 bytes". I have used the examples/default Project with the STM32L053. This MCU has 8k RAM. On your web-site there is the information that the min. RAM footprint is about 1.5k. What could I do to make to make the program fit into this MCU?
Best regards Bernhard
Hi Bernhard!
today I got the linker message "...bss will not fit in region ram .....ram overlflowed by 912 bytes". I have used the examples/default Project with the STM32L053. This MCU has 8k RAM. On your web-site there is the information that the min. RAM footprint is about 1.5k. What could I do to make to make the program fit into this MCU?
Short answer: Try compiling with CFLAGS=-DGNRC_PKTBUF_SIZE=512
Long answer: 1.) The default example includes simple link-layer support using the lower layers of the GNRC network stack. This also includes the packet buffer which is per default configured to be 6kB. This size makes kind of sense for an IPv6 setting, where you may need to store several IP datagrams with a full MTU (1280 bytes for IPv6), but is most likely way too huge for simple link-layer usage. I will open an according PR. 2.) I agree that the statement about the min. RAM footprint as mentioned on the web page is a bit imprecise. The problem to make a sensible statement about the minimum memory requirements is manyfold: what do you consider as minimum? Only the kernel? Basic networking support? Simple IP support? Only peripheral drivers? And which platform and which toolchain do you consider? If I remember correctly the 1.5k of RAM represents the RAM usage on a MSP430 with hello-world.
Cheers, Oleg