platform/prime_hub: remove .boot section

The bootloader doesn't actually look at this information, so it can
be removed. Originally, this special section was inferred from the
layout of the official firmware image.

Author: dlech

bricks/primehub/prime_hub.ld

@@ -34,9 +34,6 @@ SECTIONS
         _fw_isr_vector_src = .;   /* The isr vector table must be copied to SRAM since the
                                      firmware doesn't start at the beginning of the flash memory */
         KEEP(*(.isr_vector)) /* isr vector table */
-        . = 0x200;
-        *(.boot)           /* .boot section for info read by bootloader */
-        KEEP(*(.boot))
         *(.text)           /* .text sections (code) */
         *(.text*)          /* .text* sections (code) */
         *(.rodata)         /* .rodata sections (constants, strings, etc.) */
@@ -89,7 +86,6 @@ SECTIONS
     .checksum :
     {
         . = ALIGN(4);
-        _checksum = .;
         LONG(CHECKSUM)
     } >FLASH
 

lib/pbio/platform/prime_hub/platform.c

@@ -26,16 +26,6 @@ typedef struct {
     const void *reserved;
 } boot_t;
 
-// defined in linker script
-extern const uint32_t _checksum;
-
-// special boot info table read by bootloader
-const boot_t __attribute__((section(".boot"))) boot = {
-    .fw_ver = "v0.5.00.0020-2b83556",
-    .checksum = &_checksum,
-    .magic = (const uint8_t[16]) {1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4},
-};
-
 enum {
     COUNTER_PORT_A,
     COUNTER_PORT_B,