bricks/_common_stm32/link: Use full remaining RAM for stack.

Also rename the hub-specific value to explain that it is not the
actual stack size but only a lower bound to force a build error,
similar to upstream MicroPython.

Author: laurensvalk

bricks/_common_stm32/link.ld

@@ -4,7 +4,6 @@
 
 /* top end of the stack */
 _estack = ORIGIN(RAM) + LENGTH(RAM);
-_sstack = _estack - _stack_size;
 
 /* define output sections */
 SECTIONS
@@ -81,7 +80,8 @@ SECTIONS
     .stack :
     {
         . = ALIGN(4);
-        . = . + _stack_size; /* will cause linker error if there is not enough space for stack. */
+        _sstack = .;
+        . = . + _minimal_stack_size; /* will cause linker error if there is not enough space for stack. */
         . = ALIGN(4);
     } >RAM
 

bricks/cityhub/city_hub.ld

@@ -23,7 +23,10 @@ MEMORY
 }
 
 "MAGIC_OFFSET" = 0x100;
-_stack_size = 4K;
+
+/* Minimal stack size to allow the build to proceed. The actual stack size is whatever is left after
+   statically allocated memory. It can be tuned by setting PBSYS_CONFIG_PROGRAM_LOAD_RAM_SIZE. */
+_minimal_stack_size = 4K;
 
 /* Start of data storage. */
 _pbdrv_block_device_storage_start = ORIGIN(FLASH_USER_0);

bricks/debug/debug.ld

@@ -9,4 +9,6 @@ MEMORY
     RAM (xrw)           : ORIGIN = 0x20000000, LENGTH = 128K
 }
 
-_stack_size = 8K;
+/* Minimal stack size to allow the build to proceed. The actual stack size is whatever is left after
+   statically allocated memory. It can be tuned by setting PBSYS_CONFIG_PROGRAM_LOAD_RAM_SIZE. */
+_minimal_stack_size = 8K;

bricks/essentialhub/essential_hub.ld

@@ -18,4 +18,7 @@ MEMORY
 }
 
 "FW_INFO_OFFSET" = 0x200;
-_stack_size = 16K;
+
+/* Minimal stack size to allow the build to proceed. The actual stack size is whatever is left after
+   statically allocated memory. It can be tuned by setting PBSYS_CONFIG_PROGRAM_LOAD_RAM_SIZE. */
+_minimal_stack_size = 12K;

bricks/movehub/move_hub.ld

@@ -23,7 +23,10 @@ MEMORY
 }
 
 "MAGIC_OFFSET" = 0x100;
-_stack_size = 3K;
+
+/* Minimal stack size to allow the build to proceed. The actual stack size is whatever is left after
+   statically allocated memory. It can be tuned by setting PBSYS_CONFIG_PROGRAM_LOAD_RAM_SIZE. */
+_minimal_stack_size = 3K;
 
 /* Start of data storage. */
 _pbdrv_block_device_storage_start = ORIGIN(FLASH_USER_0);

bricks/primehub/prime_hub.ld

@@ -17,4 +17,6 @@ MEMORY
     RAM (xrw)             : ORIGIN = 0x20000000, LENGTH = 320K
 }
 
-_stack_size = 16K;
+/* Minimal stack size to allow the build to proceed. The actual stack size is whatever is left after
+   statically allocated memory. It can be tuned by setting PBSYS_CONFIG_PROGRAM_LOAD_RAM_SIZE. */
+_minimal_stack_size = 16K;

bricks/technichub/technic_hub.ld

@@ -23,7 +23,10 @@ MEMORY
 }
 
 "MAGIC_OFFSET" = 0x200;
-_stack_size = 8K;
+
+/* Minimal stack size to allow the build to proceed. The actual stack size is whatever is left after
+   statically allocated memory. It can be tuned by setting PBSYS_CONFIG_PROGRAM_LOAD_RAM_SIZE. */
+_minimal_stack_size = 8K;
 
 /* Start of data storage. */
 _pbdrv_block_device_storage_start = ORIGIN(FLASH_USER_0);