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

Author: aw

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