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[sw] 🐛 fix heap size override via console

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stnolting 2023-10-26 21:48:40 +02:00
parent e26297e669
commit 4d4bb69715
3 changed files with 6 additions and 8 deletions
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4
docs/datasheet/software.adoc
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@ -277,10 +277,10 @@ calling `make` without the need to change the makefile(s) or the linker script.
to the executable (`-g`) and will also re-define the linker script's `__neorv32_heap_size` variable setting the maximal heap
size to 4096 bytes (see sections <<_linker_script>> and <<_ram_layout>>):
.Using the `USER_FLAGS` Variable for Customization
.Using the `USER_FLAGS` Variable for Customization (setting the heap size to 4kB)
[source,bash]
----
$ make USER_FLAGS+="-g -Wl,--__neorv32_heap_size,__heap_size=4096" clean_all exe
$ make USER_FLAGS+="-Wl,--defsym,__neorv32_heap_size=4096" clean_all exe
----

6
sw/example/demo_newlib/main.c
View file

@ -55,7 +55,7 @@
/**********************************************************************//**
* @name Max heap size (from linker script's "__neorv32_heap_size")
**************************************************************************/
extern const unsigned __crt0_max_heap;
extern char __crt0_max_heap[];
/**********************************************************************//**
@ -85,12 +85,12 @@ int main() {
neorv32_uart0_printf("<<< Newlib demo/test program >>>\n\n");
// heap size definition
volatile uint32_t max_heap = (uint32_t)&__crt0_max_heap;
volatile uint32_t max_heap = (uint32_t)__crt0_max_heap;
if (max_heap > 0){
neorv32_uart0_printf("MAX heap size: %u bytes\n", max_heap);
}
else {
neorv32_uart0_printf("ERROR! No heap size defined (linker script -> '__neorv32_heap_size')!\n");
neorv32_uart0_printf("ERROR! No heap size defined (USER_FLAGS+='-Wl,--defsym,__neorv32_heap_size=1024')!\n");
return -1;
}

4
sw/example/demo_newlib/makefile
View file

@ -1,7 +1,5 @@
# Configure max HEAP size
USER_FLAGS+="-Wl,--defsym,__neorv32_heap_size=1024"
override USER_FLAGS += "-Wl,--defsym,__neorv32_heap_size=1024"
# Modify this variable to fit your NEORV32 setup (neorv32 home folder)
NEORV32_HOME ?= ../../..
include $(NEORV32_HOME)/sw/common/common.mk