| # SPDX-License-Identifier: GPL-2.0+ |
| # Copyright (c) 2016 Google, Inc |
| # Written by Simon Glass <sjg@chromium.org> |
| # |
| # Entry-type module for a U-Boot binary with an embedded microcode pointer |
| # |
| |
| import struct |
| |
| import command |
| import elf |
| from entry import Entry |
| from blob import Entry_blob |
| import fdt_util |
| import tools |
| |
| class Entry_u_boot_with_ucode_ptr(Entry_blob): |
| """U-Boot with embedded microcode pointer |
| |
| See Entry_u_boot_ucode for full details of the 3 entries involved in this |
| process. |
| """ |
| def __init__(self, image, etype, node): |
| Entry_blob.__init__(self, image, etype, node) |
| self.elf_fname = 'u-boot' |
| self.target_pos = None |
| |
| def GetDefaultFilename(self): |
| return 'u-boot-nodtb.bin' |
| |
| def ObtainContents(self): |
| # Figure out where to put the microcode pointer |
| fname = tools.GetInputFilename(self.elf_fname) |
| sym = elf.GetSymbolAddress(fname, '_dt_ucode_base_size') |
| if sym: |
| self.target_pos = sym |
| elif not fdt_util.GetBool(self._node, 'optional-ucode'): |
| self.Raise('Cannot locate _dt_ucode_base_size symbol in u-boot') |
| |
| return Entry_blob.ObtainContents(self) |
| |
| def ProcessContents(self): |
| # If the image does not need microcode, there is nothing to do |
| if not self.target_pos: |
| return |
| |
| # Get the position of the microcode |
| ucode_entry = self.image.FindEntryType('u-boot-ucode') |
| if not ucode_entry: |
| self.Raise('Cannot find microcode region u-boot-ucode') |
| |
| # Check the target pos is in the image. If it is not, then U-Boot is |
| # being linked incorrectly, or is being placed at the wrong position |
| # in the image. |
| # |
| # The image must be set up so that U-Boot is placed at the |
| # flash address to which it is linked. For example, if |
| # CONFIG_SYS_TEXT_BASE is 0xfff00000, and the ROM is 8MB, then |
| # the U-Boot region must start at position 7MB in the image. In this |
| # case the ROM starts at 0xff800000, so the position of the first |
| # entry in the image corresponds to that. |
| if (self.target_pos < self.pos or |
| self.target_pos >= self.pos + self.size): |
| self.Raise('Microcode pointer _dt_ucode_base_size at %08x is ' |
| 'outside the image ranging from %08x to %08x' % |
| (self.target_pos, self.pos, self.pos + self.size)) |
| |
| # Get the microcode, either from u-boot-ucode or u-boot-dtb-with-ucode. |
| # If we have left the microcode in the device tree, then it will be |
| # in the former. If we extracted the microcode from the device tree |
| # and collated it in one place, it will be in the latter. |
| if ucode_entry.size: |
| pos, size = ucode_entry.pos, ucode_entry.size |
| else: |
| dtb_entry = self.image.FindEntryType('u-boot-dtb-with-ucode') |
| if not dtb_entry: |
| self.Raise('Cannot find microcode region u-boot-dtb-with-ucode') |
| pos = dtb_entry.pos + dtb_entry.ucode_offset |
| size = dtb_entry.ucode_size |
| |
| # Write the microcode position and size into the entry |
| pos_and_size = struct.pack('<2L', pos, size) |
| self.target_pos -= self.pos |
| self.data = (self.data[:self.target_pos] + pos_and_size + |
| self.data[self.target_pos + 8:]) |