mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-07 13:23:20 +09:00
88 lines
3.5 KiB
Python
88 lines
3.5 KiB
Python
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# Copyright (c) 2016 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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# Entry-type module for a U-Boot binary with an embedded microcode pointer
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#
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import struct
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import command
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from entry import Entry
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from blob import Entry_blob
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import fdt_util
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import tools
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class Entry_u_boot_with_ucode_ptr(Entry_blob):
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"""U-Boot with embedded microcode pointer
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See Entry_u_boot_ucode for full details of the 3 entries involved in this
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process.
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"""
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def __init__(self, image, etype, node):
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Entry_blob.__init__(self, image, etype, node)
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self.elf_fname = 'u-boot'
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self.target_pos = None
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def GetDefaultFilename(self):
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return 'u-boot-nodtb.bin'
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def ObtainContents(self):
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# Figure out where to put the microcode pointer
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fname = tools.GetInputFilename(self.elf_fname)
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args = [['nm', fname], ['grep', '-w', '_dt_ucode_base_size']]
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out = (command.RunPipe(args, capture=True, raise_on_error=False).
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stdout.splitlines())
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if len(out) == 1:
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self.target_pos = int(out[0].split()[0], 16)
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elif not fdt_util.GetBool(self._node, 'optional-ucode'):
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self.Raise('Cannot locate _dt_ucode_base_size symbol in u-boot')
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return Entry_blob.ObtainContents(self)
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def ProcessContents(self):
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# If the image does not need microcode, there is nothing to do
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if not self.target_pos:
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return
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# Get the position of the microcode
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ucode_entry = self.image.FindEntryType('u-boot-ucode')
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if not ucode_entry:
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self.Raise('Cannot find microcode region u-boot-ucode')
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# Check the target pos is in the image. If it is not, then U-Boot is
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# being linked incorrectly, or is being placed at the wrong position
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# in the image.
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#
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# The image must be set up so that U-Boot is placed at the
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# flash address to which it is linked. For example, if
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# CONFIG_SYS_TEXT_BASE is 0xfff00000, and the ROM is 8MB, then
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# the U-Boot region must start at position 7MB in the image. In this
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# case the ROM starts at 0xff800000, so the position of the first
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# entry in the image corresponds to that.
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if (self.target_pos < self.pos or
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self.target_pos >= self.pos + self.size):
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self.Raise('Microcode pointer _dt_ucode_base_size at %08x is '
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'outside the image ranging from %08x to %08x' %
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(self.target_pos, self.pos, self.pos + self.size))
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# Get the microcode, either from u-boot-ucode or u-boot-dtb-with-ucode.
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# If we have left the microcode in the device tree, then it will be
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# in the former. If we extracted the microcode from the device tree
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# and collated it in one place, it will be in the latter.
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if ucode_entry.size:
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pos, size = ucode_entry.pos, ucode_entry.size
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else:
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dtb_entry = self.image.FindEntryType('u-boot-dtb-with-ucode')
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if not dtb_entry:
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self.Raise('Cannot find microcode region u-boot-dtb-with-ucode')
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pos = dtb_entry.pos + dtb_entry.ucode_offset
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size = dtb_entry.ucode_size
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# Write the microcode position and size into the entry
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pos_and_size = struct.pack('<2L', pos, size)
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self.target_pos -= self.pos
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self.data = (self.data[:self.target_pos] + pos_and_size +
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self.data[self.target_pos + 8:])
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