vxkernel - v0.6.0-29 : fix fxcg50 support

*fix*
> [board/fxcg50]
  | [fxcg50.ld] add ".dynamic" section support
> [kernel/src/module/kalloc]
  | [area_vhex] force first alloc block to NULL
> [vxsdk.toml]
  | [fxcg50] force little endian
  | [fxcg50] force SH4A with no-FPU instruction generation
  | [fxcg50] add missing lib dependencies (libgcc and libc)
  | [fxcg50] proper export linker flags for GCC
  | [sdl2] proper export linker script

boards/fxcg50/fxcg50.ld

@@ -95,6 +95,8 @@ SECTIONS
 	.got.plt : { *(.got.plt) *(.igot.plt) *(.igot) }
 	.got     : { *(.got) }
 
+    .dynamic : { *(.dynamic) }
+
 	/* readable / writable data */
 	.data ALIGN(4) : {
 

boards/sdl2/board.toml

@@ -14,6 +14,3 @@ modules = [
 drivers = [
     'mpu:common:sdl2'
 ]
-install_files = [
-    'sdl2.ld'
-]

kernel/src/modules/kmalloc/area_vhex.c

@@ -240,7 +240,7 @@ static void *vhex_malloc(size_t size, void *data)
 	int c = size_class(size);
 
 	/* Try to find a class that has a free block available */
-	block_t *alloc;
+	block_t *alloc = NULL;
 	for(; c <= 15; c++)
 	{
 		block_t *list = index->classes[c];

vxsdk.toml

@@ -27,6 +27,8 @@ assets_prefix = [
         '-nostdlib',
         '-fPIE',
         '-O1',
+        '-mb',
+        '-m4-nofpu',
         '-fstrict-volatile-bitfields',
         '-Wa,--dsp'
     ]
@@ -35,10 +37,14 @@ assets_prefix = [
         '-Wl,--whole-archive',
         '-lvxkernel',
         '-Wl,--no-whole-archive',
-        '@sh-elf-vhex@'
+        '@sh-elf-vhex@',
+        '-lc',
+        '-lgcc'
     ]
-    VXSDK_PUBLIC_LINKER_SCRIPT = [
-        'fxcg50.ld'
+    VXSDK_PUBLIC_BUILD_LDFLAGS = [
+        '-T {VXSDK_CURRENT_SOURCE_DIR}/boards/fxcg50/fxcg50.ld',
+        '-static-pie',
+        '-Wl,-q'
     ]
 
 [sdl2]
@@ -56,6 +62,6 @@ assets_prefix = [
         '-lSDL2',
         '-lm'
     ]
-    VXSDK_PUBLIC_LINKER_SCRIPT = [
-        'sdl2.ld'
+    VXSDK_PUBLIC_BUILD_LDFLAGS = [
+        '-T {VXSDK_CURRENT_SOURCE_DIR}/boards/sdl2/sdl2.ld',
     ]