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https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
Normally x86 platforms use the end-at-4gb option. This currently produces an FMAP with positions which have a large offset. The use of end-at-4gb is a useful convenience within binman, but we don't really want to export a map with these offsets. Fix this by subtracting the 'skip at start' parameter. Also put the code which convers names to fmap format, for clarity. Signed-off-by: Simon Glass <sjg@chromium.org>
97 lines
4.1 KiB
Python
97 lines
4.1 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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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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# 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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import elf
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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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Properties / Entry arguments:
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- filename: Filename of u-boot-nodtb.dtb (default 'u-boot-nodtb.dtb')
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- optional-ucode: boolean property to make microcode optional. If the
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u-boot.bin image does not include microcode, no error will
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be generated.
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See Entry_u_boot_ucode for full details of the three entries involved in
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this process. This entry updates U-Boot with the offset and size of the
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microcode, to allow early x86 boot code to find it without doing anything
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complicated. Otherwise it is the same as the u_boot entry.
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"""
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def __init__(self, section, etype, node):
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Entry_blob.__init__(self, section, etype, node)
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self.elf_fname = 'u-boot'
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self.target_offset = None
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def GetDefaultFilename(self):
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return 'u-boot-nodtb.bin'
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def ProcessFdt(self, fdt):
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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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sym = elf.GetSymbolAddress(fname, '_dt_ucode_base_size')
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if sym:
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self.target_offset = sym
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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 True
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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_offset:
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return
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# Get the offset of the microcode
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ucode_entry = self.section.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 section. If it is not, then U-Boot is
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# being linked incorrectly, or is being placed at the wrong offset
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# in the section.
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#
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# The section 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 offset 7MB in the section. In this
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# case the ROM starts at 0xff800000, so the offset of the first
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# entry in the section corresponds to that.
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if (self.target_offset < self.image_pos or
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self.target_offset >= self.image_pos + self.size):
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self.Raise('Microcode pointer _dt_ucode_base_size at %08x is outside the section ranging from %08x to %08x' %
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(self.target_offset, self.image_pos,
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self.image_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 latter. If we extracted the microcode from the device tree
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# and collated it in one place, it will be in the former.
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if ucode_entry.size:
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offset, size = ucode_entry.offset, ucode_entry.size
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else:
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dtb_entry = self.section.FindEntryType('u-boot-dtb-with-ucode')
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if not dtb_entry:
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dtb_entry = self.section.FindEntryType(
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'u-boot-tpl-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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offset = dtb_entry.offset + dtb_entry.ucode_offset
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size = dtb_entry.ucode_size
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# Write the microcode offset and size into the entry
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offset_and_size = struct.pack('<2L', offset, size)
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self.target_offset -= self.image_pos
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self.ProcessContentsUpdate(self.data[:self.target_offset] +
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offset_and_size +
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self.data[self.target_offset + 8:])
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