1# Copyright (c) 2016 Google, Inc 2## Written by Simon Glass <sjg@chromium.org> 3 4# SPDX-License-Identifier: GPL-2.0+ 5# 6# Entry-type module for U-Boot device tree with the microcode removed 7# 8 9import fdt 10from entry import Entry 11from blob import Entry_blob 12import tools 13 14class Entry_u_boot_dtb_with_ucode(Entry_blob): 15 """A U-Boot device tree file, with the microcode removed 16 17 See Entry_u_boot_ucode for full details of the 3 entries involved in this 18 process. 19 """ 20 def __init__(self, image, etype, node): 21 Entry_blob.__init__(self, image, etype, node) 22 self.ucode_data = '' 23 self.collate = False 24 self.ucode_offset = None 25 self.ucode_size = None 26 27 def GetDefaultFilename(self): 28 return 'u-boot.dtb' 29 30 def ObtainContents(self): 31 Entry_blob.ObtainContents(self) 32 33 # If the image does not need microcode, there is nothing to do 34 ucode_dest_entry = self.image.FindEntryType('u-boot-spl-with-ucode-ptr') 35 if not ucode_dest_entry or not ucode_dest_entry.target_pos: 36 ucode_dest_entry = self.image.FindEntryType('u-boot-with-ucode-ptr') 37 if not ucode_dest_entry or not ucode_dest_entry.target_pos: 38 return True 39 40 # Create a new file to hold the copied device tree 41 dtb_name = 'u-boot-dtb-with-ucode.dtb' 42 fname = tools.GetOutputFilename(dtb_name) 43 with open(fname, 'wb') as fd: 44 fd.write(self.data) 45 46 # Remove the microcode 47 dtb = fdt.FdtScan(fname) 48 ucode = dtb.GetNode('/microcode') 49 if not ucode: 50 raise self.Raise("No /microcode node found in '%s'" % fname) 51 52 # There's no need to collate it (move all microcode into one place) 53 # if we only have one chunk of microcode. 54 self.collate = len(ucode.subnodes) > 1 55 for node in ucode.subnodes: 56 data_prop = node.props.get('data') 57 if data_prop: 58 self.ucode_data += ''.join(data_prop.bytes) 59 if self.collate: 60 prop = node.DeleteProp('data') 61 else: 62 # Find the offset in the device tree of the ucode data 63 self.ucode_offset = data_prop.GetOffset() + 12 64 self.ucode_size = len(data_prop.bytes) 65 if self.collate: 66 dtb.Pack() 67 dtb.Flush() 68 69 # Make this file the contents of this entry 70 self._pathname = fname 71 self.ReadContents() 72 return True 73