diff options
| -rw-r--r-- | tools/binman/README.entries | 22 | ||||
| -rw-r--r-- | tools/binman/etype/u_boot_tpl_bss_pad.py | 44 | ||||
| -rw-r--r-- | tools/binman/ftest.py | 16 | ||||
| -rw-r--r-- | tools/binman/test/193_tpl_bss_pad.dts | 19 |
4 files changed, 101 insertions, 0 deletions
diff --git a/tools/binman/README.entries b/tools/binman/README.entries index 8651ba05f2..368c976497 100644 --- a/tools/binman/README.entries +++ b/tools/binman/README.entries @@ -1056,6 +1056,28 @@ binman uses that to look up symbols to write into the TPL binary. +Entry: u-boot-tpl-bss-pad: U-Boot TPL binary padded with a BSS region +--------------------------------------------------------------------- + +Properties / Entry arguments: + None + +This holds the padding added after the TPL binary to cover the BSS (Block +Started by Symbol) region. This region holds the various variables used by +TPL. It is set to 0 by TPL when it starts up. If you want to append data to +the TPL image (such as a device tree file), you must pad out the BSS region +to avoid the data overlapping with U-Boot variables. This entry is useful in +that case. It automatically pads out the entry size to cover both the code, +data and BSS. + +The contents of this entry will a certain number of zero bytes, determined +by __bss_size + +The ELF file 'tpl/u-boot-tpl' must also be available for this to work, since +binman uses that to look up the BSS address. + + + Entry: u-boot-tpl-dtb: U-Boot TPL device tree --------------------------------------------- diff --git a/tools/binman/etype/u_boot_tpl_bss_pad.py b/tools/binman/etype/u_boot_tpl_bss_pad.py new file mode 100644 index 0000000000..521b24a384 --- /dev/null +++ b/tools/binman/etype/u_boot_tpl_bss_pad.py @@ -0,0 +1,44 @@ +# SPDX-License-Identifier: GPL-2.0+ +# Copyright 2021 Google LLC +# Written by Simon Glass <sjg@chromium.org> +# +# Entry-type module for BSS padding for tpl/u-boot-tpl.bin. This padding +# can be added after the TPL binary to ensure that anything concatenated +# to it will appear to TPL to be at the end of BSS rather than the start. +# + +from binman import elf +from binman.entry import Entry +from binman.etype.blob import Entry_blob +from patman import tools + +class Entry_u_boot_tpl_bss_pad(Entry_blob): + """U-Boot TPL binary padded with a BSS region + + Properties / Entry arguments: + None + + This holds the padding added after the TPL binary to cover the BSS (Block + Started by Symbol) region. This region holds the various variables used by + TPL. It is set to 0 by TPL when it starts up. If you want to append data to + the TPL image (such as a device tree file), you must pad out the BSS region + to avoid the data overlapping with U-Boot variables. This entry is useful in + that case. It automatically pads out the entry size to cover both the code, + data and BSS. + + The contents of this entry will a certain number of zero bytes, determined + by __bss_size + + The ELF file 'tpl/u-boot-tpl' must also be available for this to work, since + binman uses that to look up the BSS address. + """ + def __init__(self, section, etype, node): + super().__init__(section, etype, node) + + def ObtainContents(self): + fname = tools.GetInputFilename('tpl/u-boot-tpl') + bss_size = elf.GetSymbolAddress(fname, '__bss_size') + if not bss_size: + self.Raise('Expected __bss_size symbol in tpl/u-boot-tpl') + self.SetContents(tools.GetBytes(0, bss_size)) + return True diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py index 684e507e6e..d1bf64ce27 100644 --- a/tools/binman/ftest.py +++ b/tools/binman/ftest.py @@ -4262,6 +4262,22 @@ class TestFunctional(unittest.TestCase): self.assertEqual(U_BOOT_TPL_NODTB_DATA, data[:len(U_BOOT_TPL_NODTB_DATA)]) + def testTplBssPad(self): + """Test that we can pad TPL's BSS with zeros""" + # ELF file with a '__bss_size' symbol + self._SetupTplElf() + data = self._DoReadFile('193_tpl_bss_pad.dts') + self.assertEqual(U_BOOT_TPL_DATA + tools.GetBytes(0, 10) + U_BOOT_DATA, + data) + + def testTplBssPadMissing(self): + """Test that a missing symbol is detected""" + self._SetupTplElf('u_boot_ucode_ptr') + with self.assertRaises(ValueError) as e: + self._DoReadFile('193_tpl_bss_pad.dts') + self.assertIn('Expected __bss_size symbol in tpl/u-boot-tpl', + str(e.exception)) + if __name__ == "__main__": unittest.main() diff --git a/tools/binman/test/193_tpl_bss_pad.dts b/tools/binman/test/193_tpl_bss_pad.dts new file mode 100644 index 0000000000..f5c2db0646 --- /dev/null +++ b/tools/binman/test/193_tpl_bss_pad.dts @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0+ + +/dts-v1/; + +/ { + #address-cells = <1>; + #size-cells = <1>; + + binman { + u-boot-tpl { + }; + + u-boot-tpl-bss-pad { + }; + + u-boot { + }; + }; +}; |