[PATCH 3/5] binman: Support adding a U-Boot environment
Andy Shevchenko
andriy.shevchenko at linux.intel.com
Fri Sep 4 11:37:16 CEST 2020
On Thu, Sep 03, 2020 at 07:28:54PM -0600, Simon Glass wrote:
> 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
Acked-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
> tools/binman/etype/u_boot_env.py | 42 +++++++++++++++++++++++++
> tools/binman/ftest.py | 31 ++++++++++++++++++
> tools/binman/test/174_env.dts | 20 ++++++++++++
> tools/binman/test/175_env_no_size.dts | 19 +++++++++++
> tools/binman/test/176_env_too_small.dts | 20 ++++++++++++
> 5 files changed, 132 insertions(+)
> create mode 100644 tools/binman/etype/u_boot_env.py
> create mode 100644 tools/binman/test/174_env.dts
> create mode 100644 tools/binman/test/175_env_no_size.dts
> create mode 100644 tools/binman/test/176_env_too_small.dts
>
> diff --git a/tools/binman/etype/u_boot_env.py b/tools/binman/etype/u_boot_env.py
> new file mode 100644
> index 00000000000..1694c2a6eef
> --- /dev/null
> +++ b/tools/binman/etype/u_boot_env.py
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: GPL-2.0+
> +# Copyright (c) 2018 Google, Inc
> +# Written by Simon Glass <sjg at chromium.org>
> +#
> +
> +import struct
> +import zlib
> +
> +from binman.etype.blob import Entry_blob
> +from dtoc import fdt_util
> +from patman import tools
> +
> +class Entry_u_boot_env(Entry_blob):
> + """An entry which contains a U-Boot environment
> +
> + Properties / Entry arguments:
> + - filename: File containing the environment text, with each line in the
> + form var=value
> + """
> + def __init__(self, section, etype, node):
> + super().__init__(section, etype, node)
> +
> + def ReadNode(self):
> + super().ReadNode()
> + if self.size is None:
> + self.Raise("'u-boot-env' entry must have a size property")
> + self.fill_value = fdt_util.GetByte(self._node, 'fill-byte', 0)
> +
> + def ReadBlobContents(self):
> + indata = tools.ReadFile(self._pathname)
> + data = b''
> + for line in indata.splitlines():
> + data += line + b'\0'
> + data += b'\0';
> + pad = self.size - len(data) - 5
> + if pad < 0:
> + self.Raise("'u-boot-env' entry too small to hold data (need %#x more bytes)" % -pad)
> + data += tools.GetBytes(self.fill_value, pad)
> + crc = zlib.crc32(data)
> + buf = struct.pack('<I', crc) + b'\x01' + data
> + self.SetContents(buf)
> + return True
> diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
> index 91225459162..b771b9d5df7 100644
> --- a/tools/binman/ftest.py
> +++ b/tools/binman/ftest.py
> @@ -77,6 +77,7 @@ FSP_T_DATA = b'fsp_t'
> ATF_BL31_DATA = b'bl31'
> TEST_FDT1_DATA = b'fdt1'
> TEST_FDT2_DATA = b'test-fdt2'
> +ENV_DATA = b'var1=1\nvar2="2"'
>
> # Subdirectory of the input dir to use to put test FDTs
> TEST_FDT_SUBDIR = 'fdts'
> @@ -181,6 +182,8 @@ class TestFunctional(unittest.TestCase):
> TestFunctional._MakeInputFile('%s/test-fdt2.dtb' % TEST_FDT_SUBDIR,
> TEST_FDT2_DATA)
>
> + TestFunctional._MakeInputFile('env.txt', ENV_DATA)
> +
> # Travis-CI may have an old lz4
> cls.have_lz4 = True
> try:
> @@ -3715,5 +3718,33 @@ class TestFunctional(unittest.TestCase):
> self.assertIn("Filename 'missing' not found in input path",
> str(e.exception))
>
> + def testEnvironment(self):
> + """Test adding a U-Boot environment"""
> + data = self._DoReadFile('174_env.dts')
> + self.assertEqual(U_BOOT_DATA, data[:len(U_BOOT_DATA)])
> + self.assertEqual(U_BOOT_NODTB_DATA, data[-len(U_BOOT_NODTB_DATA):])
> + env = data[len(U_BOOT_DATA):-len(U_BOOT_NODTB_DATA)]
> + self.assertEqual(b'\x1b\x97\x22\x7c\x01var1=1\0var2="2"\0\0\xff\xff',
> + env)
> +
> + def testEnvironmentNoSize(self):
> + """Test that a missing 'size' property is detected"""
> + with self.assertRaises(ValueError) as e:
> + data = self._DoTestFile('175_env_no_size.dts')
> + self.assertIn("'u-boot-env' entry must have a size property",
> + str(e.exception))
> +
> + def testEnvironmentTooSmall(self):
> + """Test handling of an environment that does not fit"""
> + with self.assertRaises(ValueError) as e:
> + data = self._DoTestFile('176_env_too_small.dts')
> +
> + # checksum, start byte, environment with \0 terminator, final \0
> + need = 4 + 1 + len(ENV_DATA) + 1 + 1
> + short = need - 0x8
> + self.assertIn("too small to hold data (need %#x more bytes)" % short,
> + str(e.exception))
> +
> +
> if __name__ == "__main__":
> unittest.main()
> diff --git a/tools/binman/test/174_env.dts b/tools/binman/test/174_env.dts
> new file mode 100644
> index 00000000000..d1393d2db93
> --- /dev/null
> +++ b/tools/binman/test/174_env.dts
> @@ -0,0 +1,20 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/dts-v1/;
> +
> +/ {
> + #address-cells = <1>;
> + #size-cells = <1>;
> +
> + binman {
> + u-boot {
> + };
> + u-boot-env {
> + filename = "env.txt";
> + size = <0x18>;
> + fill-byte = [ff];
> + };
> + u-boot-nodtb {
> + };
> + };
> +};
> diff --git a/tools/binman/test/175_env_no_size.dts b/tools/binman/test/175_env_no_size.dts
> new file mode 100644
> index 00000000000..267acd15491
> --- /dev/null
> +++ b/tools/binman/test/175_env_no_size.dts
> @@ -0,0 +1,19 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/dts-v1/;
> +
> +/ {
> + #address-cells = <1>;
> + #size-cells = <1>;
> +
> + binman {
> + u-boot {
> + };
> + u-boot-env {
> + filename = "env.txt";
> + fill-byte = [ff];
> + };
> + u-boot-nodtb {
> + };
> + };
> +};
> diff --git a/tools/binman/test/176_env_too_small.dts b/tools/binman/test/176_env_too_small.dts
> new file mode 100644
> index 00000000000..2db8d054639
> --- /dev/null
> +++ b/tools/binman/test/176_env_too_small.dts
> @@ -0,0 +1,20 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/dts-v1/;
> +
> +/ {
> + #address-cells = <1>;
> + #size-cells = <1>;
> +
> + binman {
> + u-boot {
> + };
> + u-boot-env {
> + filename = "env.txt";
> + size = <0x8>;
> + fill-byte = [ff];
> + };
> + u-boot-nodtb {
> + };
> + };
> +};
> --
> 2.28.0.526.ge36021eeef-goog
>
--
With Best Regards,
Andy Shevchenko
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