Linker load flash refactor fill memory (#294)

* sw Makefile and general readme minor modifications

- For the Makefile within the SW folder, the wildcard was not behaving as expected for GNU make 4.3.
- For the general Readme, added the verible stuff before any make, and adding an initial folder structure. This structure can be helpful for someone new to get a initial organizational sense of the project.

* fix uart pins and spi flash memory size

* Added macro for uart baudrate by default based on the target

* linker modification for the flash (.data section being in wrong place)

* Added cmake + cpp with the same upstream folder structure

* Major commit includding Makefile doc automatisation, CMake, and FreeRTOS porting

1. Makefile doc automatisation
2. CMake
3. FreeRTOS porting (new linker tpl, new vectors.S)

* Minor permission changes

* Update README.md

* Minor CMake, linker, freeRTOS, and Makefile modifications

- Avoid creating an extra template for freertos linker.
- Modifying CMakeLists to be compliant with all apps (baremetal and freertos based)
- Readme and other minor modifications

* FPGA testing + commands automatizations

- change pin assignment to get the tricolor led working for the freertos application
- Modify readme files to update with all the different commands
- created a gdbInit file

* Updating readme and app for freertos

* CMake auto backend

No need to deal with hard-coded paths, CMake searches for you! :)

* fix CMake include list

* minor update

remove some comments
add additional command to directly run blinky freertos

* Using the needed HEAP for the current freeRTOS example

* Fixing apps and CMakeLists

* Re-adjust ram. Re-size also stack and heap for on-chip linker

* Add comment hjson

* Modify Readme

* Updating CMake backend

* Change crt logic based on supported preprocessor variables

* Added vector file for freertos

* Fix compilation issues with some APPs

* Added script to compile them all

* Added script file

* Fill linker flash load up to __boot_address

sw/linker/link_flash_load.ld.tpl

@@ -26,42 +26,15 @@ SECTIONS {
     {
         PROVIDE(__vector_start = .);
         KEEP(*(.vectors));
+        __VECTORS_AT = .;
     } >RAM AT >FLASH
 
-    /* this should be removed or made elegant */
+    /* Fill memory up to __boot_address */
     .fill :
     {
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
-        LONG(0xDEADBEEF);
+        FILL(0xDEADBEEF);
+        . = ORIGIN(RAM) + (__boot_address) - 1;
+        BYTE(0xEE)
     } >RAM AT >FLASH
 
     /* crt0 init code */