[fpc-devel] Raspberry Pi Pico: Heapsize is initialized with wrong value

[Michael Ring]

I am using heapmgr but with trunk compiler the value of __heapsize is 
plain wrong (and way too big)

When I compile my code with my old compiler for pico all is fine, when I 
debug into heapmgr I see that __heapsize is set correctly to 16384 based 
on this setting:

program spi_st7789;
{$MODE OBJFPC}
{$H+}
{$MEMORY 16384,16384}

When I use current main compiler the value is 308528 which is more than 
available memory, this is why I found the issue....


The reason for this is that a line from my original code for linkerfile 
generation was not included:

       Add('    *(.data .data.*)');
       // Special Section for the Raspberry Pico, needed for linking to spi
*      Add('    *(.time_critical*)');
*      Add('    KEEP (*(.fpc .fpc.n_version .fpc.n_links))');
       Add('    _edata = .;');


and for that reason the content of that section in loaded to start of 
flash (and during startup to ram) instead of the correct data for __heapsize

Was there a reason for leaving this out when my code was merged to main?


I guess no, so I will create a PR to fix this issue, please comment when 
there was a reason for leaving this out.


Michael
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freepascal.org/pipermail/fpc-devel/attachments/20240401/4851f6b1/attachment.htm>