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