loader: change stack size from 32 words to 128 words

If you need to place more local variables or do complex function call, take care of the stack size, you may need to increase it

loader/startup.S

@@ -18,6 +18,8 @@ _start:
 	csrw mcause, x0
 	csrw mtval, x0
 
+        /* no global variables or static variables are allowed in loader_main and its called sub functions */
+        /* TODO: take care of the stack size usage, if your function and subfunction are complex and use many variable */
 	jal loader_main
 
 	ebreak
@@ -33,5 +35,7 @@ early_exc_entry:
 	.section .data
 	.balign REGBYTES
 stack:
-	.fill 32, REGBYTES, 0x8675309
+        /* TODO: Change 128 to bigger size if your code is complex and workarea is big enough */
+        /* Otherwise it may crupt normal text section code */
+	.fill 128, REGBYTES, 0x8675309
 stack_end: