mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
fb91d5675e
In some cases it is useful to include a U-Boot environment region in an image. This allows the board to start up with an environment ready to go. Add a new entry type for this. The input is a text file containing the environment entries, one per line, in the format: var=value Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
43 lines
1.3 KiB
Python
43 lines
1.3 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2018 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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import struct
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import zlib
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from binman.etype.blob import Entry_blob
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from dtoc import fdt_util
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from patman import tools
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class Entry_u_boot_env(Entry_blob):
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"""An entry which contains a U-Boot environment
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Properties / Entry arguments:
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- filename: File containing the environment text, with each line in the
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form var=value
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"""
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def __init__(self, section, etype, node):
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super().__init__(section, etype, node)
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def ReadNode(self):
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super().ReadNode()
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if self.size is None:
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self.Raise("'u-boot-env' entry must have a size property")
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self.fill_value = fdt_util.GetByte(self._node, 'fill-byte', 0)
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def ReadBlobContents(self):
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indata = tools.ReadFile(self._pathname)
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data = b''
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for line in indata.splitlines():
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data += line + b'\0'
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data += b'\0';
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pad = self.size - len(data) - 5
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if pad < 0:
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self.Raise("'u-boot-env' entry too small to hold data (need %#x more bytes)" % -pad)
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data += tools.GetBytes(self.fill_value, pad)
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crc = zlib.crc32(data)
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buf = struct.pack('<I', crc) + b'\x01' + data
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self.SetContents(buf)
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return True
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