mirror of
https://github.com/brain-hackers/u-boot-brain
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f025363543
When TPL is used on x86 we may want to program the microcode (at least for the first CPU) early in boot. Add support for this by refactoring the existing code to be more generic. Signed-off-by: Simon Glass <sjg@chromium.org>
97 lines
4.0 KiB
Python
97 lines
4.0 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.offset or
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self.target_offset >= self.offset + self.size):
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self.Raise('Microcode pointer _dt_ucode_base_size at %08x is '
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'outside the section ranging from %08x to %08x' %
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(self.target_offset, self.offset, self.offset + 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.offset
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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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