1#!/usr/bin/python 2# 3# Copyright (C) 2016 Google, Inc 4# Written by Simon Glass <sjg@chromium.org> 5# 6# SPDX-License-Identifier: GPL-2.0+ 7# 8 9import os 10import struct 11import tempfile 12 13import command 14import tools 15 16def fdt32_to_cpu(val): 17 """Convert a device tree cell to an integer 18 19 Args: 20 Value to convert (4-character string representing the cell value) 21 22 Return: 23 A native-endian integer value 24 """ 25 return struct.unpack(">I", val)[0] 26 27def EnsureCompiled(fname): 28 """Compile an fdt .dts source file into a .dtb binary blob if needed. 29 30 Args: 31 fname: Filename (if .dts it will be compiled). It not it will be 32 left alone 33 34 Returns: 35 Filename of resulting .dtb file 36 """ 37 _, ext = os.path.splitext(fname) 38 if ext != '.dts': 39 return fname 40 41 dts_input = tools.GetOutputFilename('source.dts') 42 dtb_output = tools.GetOutputFilename('source.dtb') 43 44 search_paths = [os.path.join(os.getcwd(), 'include')] 45 root, _ = os.path.splitext(fname) 46 args = ['-E', '-P', '-x', 'assembler-with-cpp', '-D__ASSEMBLY__'] 47 args += ['-Ulinux'] 48 for path in search_paths: 49 args.extend(['-I', path]) 50 args += ['-o', dts_input, fname] 51 command.Run('cc', *args) 52 53 # If we don't have a directory, put it in the tools tempdir 54 search_list = [] 55 for path in search_paths: 56 search_list.extend(['-i', path]) 57 args = ['-I', 'dts', '-o', dtb_output, '-O', 'dtb'] 58 args.extend(search_list) 59 args.append(dts_input) 60 command.Run('dtc', *args) 61 return dtb_output 62