Fixed screen brightness problems (tested on 1.0.0 and 2.0.0). Some refactoring.

ipl/util.c

@@ -35,3 +35,16 @@ void exec_cfg(u32 *base, const cfg_op_t *ops, u32 num_ops)
 		base[ops[i].off] = ops[i].val;
 }
 
+#define CRC32C_POLY 0x82F63B78
+u32 crc32c(const void *buf, u32 len)
+{
+	const u8 *cbuf = (const u8 *)buf;
+	u32 crc = 0xFFFFFFFF;
+	while (len--)
+	{
+		crc ^= *cbuf++;
+		for (int i = 0; i < 8; i++)
+			crc = crc & 1 ? (crc >> 1) ^ CRC32C_POLY : crc >> 1;
+	}
+	return ~crc;
+}