tools/kernel2minor: fix endian conversion issues, allow creating little-endian images

Signed-off-by: Felix Fietkau <nbd@nbd.name>

tools/kernel2minor/patches/110-fix_endian_conv.patch

@@ -0,0 +1,33 @@
+--- a/k2m_biops.h
++++ b/k2m_biops.h
+@@ -10,7 +10,9 @@
+ */
+ 
+ //нужна ли конвертация. устанавливавется автоматически в 1 для НЕ big_endian систем
+-static int endian_need_conv = __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__;
++static int big_endian;
++
++#define endian_need_conv (!!big_endian ^ (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
+ 
+ /* конвертор из одного байтового порядка в обратный
+    x обязательно должна быть переменной но не выражением !
+--- a/kernel2minor.c
++++ b/kernel2minor.c
+@@ -76,7 +76,7 @@ void print_help(void){
+   char *usage[] =
+     { "-k", "Path to kernel file", kernel_file,
+       "-r", "Path to result file", res_file,
+-      "-e", "Enable endian convert", endian_need_conv ? "Yes" : "No",
++      "-e", "Enable endian convert to big-endian", big_endian ? "Yes" : "No",
+       "-c", "Use ECC", use_ecc ? "Yes" : "No",
+       "-s", "FLASH Unit(Chunk) size", chunk_size_str,
+       "-i", "Add image info block", add_image_info_block ? info_block_size_str : "No",
+@@ -595,7 +595,7 @@ int main(int argc, char *argv[]){
+       case 'k': snprintf(kernel_file, sizeof(kernel_file) - 1, "%s", optarg); break;
+       case 'r': snprintf(res_file, sizeof(res_file) - 1, "%s", optarg); break;
+       case 'c': use_ecc = 1; break;
+-      case 'e': endian_need_conv = 1; break;
++      case 'e': big_endian = 1; break;
+       case 's': chunk_size = atoi(optarg); break;
+       case 'i': add_image_info_block = 1; align_size = atoi(optarg); break;
+       case 'p': strncpy(platform_name, optarg, sizeof(platform_name)); break;