2018-05-07 06:58:06 +09:00
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# SPDX-License-Identifier: GPL-2.0+
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2016-11-26 12:15:55 +09:00
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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 BSS padding for spl/u-boot-spl.bin. This padding
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# can be added after the SPL binary to ensure that anything concatenated
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# to it will appear to SPL to be at the end of BSS rather than the start.
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#
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import command
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2017-11-14 10:54:54 +09:00
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import elf
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2016-11-26 12:15:55 +09:00
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from entry import Entry
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from blob import Entry_blob
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import tools
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class Entry_u_boot_spl_bss_pad(Entry_blob):
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2018-07-18 04:25:35 +09:00
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"""U-Boot SPL binary padded with a BSS region
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Properties / Entry arguments:
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None
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This is similar to u_boot_spl except that padding is added after the SPL
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binary to cover the BSS (Block Started by Symbol) region. This region holds
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the various used by SPL. It is set to 0 by SPL when it starts up. If you
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want to append data to the SPL image (such as a device tree file), you must
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pad out the BSS region to avoid the data overlapping with U-Boot variables.
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This entry is useful in that case. It automatically pads out the entry size
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to cover both the code, data and BSS.
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The ELF file 'spl/u-boot-spl' must also be available for this to work, since
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binman uses that to look up the BSS address.
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"""
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2018-06-02 00:38:14 +09:00
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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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2016-11-26 12:15:55 +09:00
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def ObtainContents(self):
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fname = tools.GetInputFilename('spl/u-boot-spl')
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2017-11-14 10:54:54 +09:00
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bss_size = elf.GetSymbolAddress(fname, '__bss_size')
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if not bss_size:
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self.Raise('Expected __bss_size symbol in spl/u-boot-spl')
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2019-05-15 06:53:47 +09:00
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self.SetContents(tools.GetBytes(0, bss_size))
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2018-07-07 01:27:17 +09:00
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return True
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