Fix boot process so the board boots by default. Remove unused linker …

…script configs

fiveforths.ld

@@ -15,54 +15,7 @@ SECTIONS {
  {
  . = ALIGN(4);
  *(.text) /* .text sections (code) */
- *(.text*) /* .text* sections (code) */
  *(.rodata) /* .rodata sections (constants, strings, etc.) */
- *(.rodata*) /* .rodata* sections (constants, strings, etc.) */
- *(.srodata) /* .rodata sections (constants, strings, etc.) */
- *(.srodata*) /* .rodata* sections (constants, strings, etc.) */
- _etext = .; /* define a global symbol at end of code */
- _sidata = _etext; /* This is used by the startup in order to initialize the .data secion */
  } >FLASH
 
- /* This is the initialized data section
- The program executes knowing that the data is in the RAM
- but the loader puts the initial values in the FLASH (inidata).
- It is one task of the startup to copy the initial values from FLASH to RAM. */
- .data : AT ( _sidata )
- {
- . = ALIGN(4);
- _sdata = .; /* create a global symbol at data start; used by startup code in order to initialise the .d
-ata section in RAM */
- _ram_start = .; /* create a global symbol at ram start for garbage collector */
- . = ALIGN(4);
- *(.data) /* .data sections */
- *(.data*) /* .data* sections */
- *(.sdata) /* .sdata sections */
- *(.sdata*) /* .sdata* sections */
- . = ALIGN(4);
- _edata = .; /* define a global symbol at data end; used by startup code in order to initialise the .dat
-a section in RAM */
- } >RAM
-
- /* Uninitialized data section */
- .bss :
- {
- . = ALIGN(4);
- _sbss = .; /* define a global symbol at bss start; used by startup code */
- *(.bss)
- *(.bss*)
- *(.sbss)
- *(.sbss*)
- *(COMMON)
-
- . = ALIGN(4);
- _ebss = .; /* define a global symbol at bss end; used by startup code */
- } >RAM
-
- /* this is to define the start of the heap, and make sure we have a minimum size */
- .heap :
- {
- . = ALIGN(4);
- _heap_start = .; /* define a global symbol at heap start */
- } >RAM
 }

src/03-interrupts.s

@@ -3,6 +3,9 @@
 ##
 
 .text
+.global _start
+_start:
+ j boot
 
 .balign CELL
 .global interrupt_handler

src/06-initialization.s

@@ -6,7 +6,7 @@
 .global _start
 
 # board boot initializations
-_start:
+boot:
  call interrupt_init # RISC-V interrupt CSR initialization
  call uart_init # board specific UART initialization
  call gpio_init # board specific GPIO initialization