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sandbox: image: Create a test for loading FIT images

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The image code is fairly complex with various different options. It would
be useful to have comprehensive tests for this.

As a start, create a script which tries out loading a kernel/ramdisk/fdt
from a FIT and checks that the images appear in the right place in memory.

This uses sandbox which now supports bootm and related features.

Signed-off-by: Simon Glass <sjg@chromium.org>
master
Simon Glass 12 years ago committed by Tom Rini
parent 13167dac19
commit 301e803867
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      test/image/test-fit.py

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test/image/test-fit.py
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#!/usr/bin/python
#
# Copyright (c) 2013, Google Inc.
#
# Sanity check of the FIT handling in U-Boot
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#
# To run this:
#
# make O=sandbox sandbox_config
# make O=sandbox
# ./test/image/test-fit.py -u sandbox/u-boot
import doctest
from optparse import OptionParser
import os
import shutil
import struct
import sys
import tempfile
# The 'command' library in patman is convenient for running commands
base_path = os.path.dirname(sys.argv[0])
patman = os.path.join(base_path, '../../tools/patman')
sys.path.append(patman)
import command
# Define a base ITS which we can adjust using % and a dictionary
base_its = '''
/dts-v1/;
/ {
description = "Chrome OS kernel image with one or more FDT blobs";
#address-cells = <1>;
images {
kernel@1 {
data = /incbin/("%(kernel)s");
type = "kernel";
arch = "sandbox";
os = "linux";
compression = "none";
load = <0x40000>;
entry = <0x8>;
};
fdt@1 {
description = "snow";
data = /incbin/("u-boot.dtb");
type = "flat_dt";
arch = "sandbox";
%(fdt_load)s
compression = "none";
signature@1 {
algo = "sha1,rsa2048";
key-name-hint = "dev";
};
};
ramdisk@1 {
description = "snow";
data = /incbin/("%(ramdisk)s");
type = "ramdisk";
arch = "sandbox";
os = "linux";
%(ramdisk_load)s
compression = "none";
};
};
configurations {
default = "conf@1";
conf@1 {
kernel = "kernel@1";
fdt = "fdt@1";
%(ramdisk_config)s
};
};
};
'''
# Define a base FDT - currently we don't use anything in this
base_fdt = '''
/dts-v1/;
/ {
model = "Sandbox Verified Boot Test";
compatible = "sandbox";
};
'''
# This is the U-Boot script that is run for each test. First load the fit,
# then do the 'bootm' command, then save out memory from the places where
# we expect 'bootm' to write things. Then quit.
base_script = '''
sb load host 0 %(fit_addr)x %(fit)s
fdt addr %(fit_addr)x
bootm start %(fit_addr)x
bootm loados
sb save host 0 %(kernel_out)s %(kernel_addr)x %(kernel_size)x
sb save host 0 %(fdt_out)s %(fdt_addr)x %(fdt_size)x
sb save host 0 %(ramdisk_out)s %(ramdisk_addr)x %(ramdisk_size)x
reset
'''
def make_fname(leaf):
"""Make a temporary filename
Args:
leaf: Leaf name of file to create (within temporary directory)
Return:
Temporary filename
"""
global base_dir
return os.path.join(base_dir, leaf)
def filesize(fname):
"""Get the size of a file
Args:
fname: Filename to check
Return:
Size of file in bytes
"""
return os.stat(fname).st_size
def read_file(fname):
"""Read the contents of a file
Args:
fname: Filename to read
Returns:
Contents of file as a string
"""
with open(fname, 'r') as fd:
return fd.read()
def make_dtb():
"""Make a sample .dts file and compile it to a .dtb
Returns:
Filename of .dtb file created
"""
src = make_fname('u-boot.dts')
dtb = make_fname('u-boot.dtb')
with open(src, 'w') as fd:
print >>fd, base_fdt
command.Output('dtc', src, '-O', 'dtb', '-o', dtb)
return dtb
def make_its(params):
"""Make a sample .its file with parameters embedded
Args:
params: Dictionary containing parameters to embed in the %() strings
Returns:
Filename of .its file created
"""
its = make_fname('test.its')
with open(its, 'w') as fd:
print >>fd, base_its % params
return its
def make_fit(mkimage, params):
"""Make a sample .fit file ready for loading
This creates a .its script with the selected parameters and uses mkimage to
turn this into a .fit image.
Args:
mkimage: Filename of 'mkimage' utility
params: Dictionary containing parameters to embed in the %() strings
Return:
Filename of .fit file created
"""
fit = make_fname('test.fit')
its = make_its(params)
command.Output(mkimage, '-f', its, fit)
with open(make_fname('u-boot.dts'), 'w') as fd:
print >>fd, base_fdt
return fit
def make_kernel():
"""Make a sample kernel with test data
Returns:
Filename of kernel created
"""
fname = make_fname('test-kernel.bin')
data = ''
for i in range(100):
data += 'this kernel %d is unlikely to boot\n' % i
with open(fname, 'w') as fd:
print >>fd, data
return fname
def make_ramdisk():
"""Make a sample ramdisk with test data
Returns:
Filename of ramdisk created
"""
fname = make_fname('test-ramdisk.bin')
data = ''
for i in range(100):
data += 'ramdisk %d was seldom used in the middle ages\n' % i
with open(fname, 'w') as fd:
print >>fd, data
return fname
def find_matching(text, match):
"""Find a match in a line of text, and return the unmatched line portion
This is used to extract a part of a line from some text. The match string
is used to locate the line - we use the first line that contains that
match text.
Once we find a match, we discard the match string itself from the line,
and return what remains.
TODO: If this function becomes more generally useful, we could change it
to use regex and return groups.
Args:
text: Text to check (each line separated by \n)
match: String to search for
Return:
String containing unmatched portion of line
Exceptions:
ValueError: If match is not found
>>> find_matching('first line:10\\nsecond_line:20', 'first line:')
'10'
>>> find_matching('first line:10\\nsecond_line:20', 'second linex')
Traceback (most recent call last):
...
ValueError: Test aborted
>>> find_matching('first line:10\\nsecond_line:20', 'second_line:')
'20'
"""
for line in text.splitlines():
pos = line.find(match)
if pos != -1:
return line[:pos] + line[pos + len(match):]
print "Expected '%s' but not found in output:"
print text
raise ValueError('Test aborted')
def set_test(name):
"""Set the name of the current test and print a message
Args:
name: Name of test
"""
global test_name
test_name = name
print name
def fail(msg):
"""Raise an error with a helpful failure message
Args:
msg: Message to display
"""
raise ValueError("Test '%s' failed: %s" % (test_name, msg))
def run_fit_test(mkimage, u_boot):
"""Basic sanity check of FIT loading in U-Boot
TODO: Almost everything:
- hash algorithms - invalid hash/contents should be detected
- signature algorithms - invalid sig/contents should be detected
- compression
- checking that errors are detected like:
- image overwriting
- missing images
- invalid configurations
- incorrect os/arch/type fields
- empty data
- images too large/small
- invalid FDT (e.g. putting a random binary in instead)
- default configuration selection
- bootm command line parameters should have desired effect
- run code coverage to make sure we are testing all the code
"""
global test_name
# Set up invariant files
control_dtb = make_dtb()
kernel = make_kernel()
ramdisk = make_ramdisk()
kernel_out = make_fname('kernel-out.bin')
fdt_out = make_fname('fdt-out.dtb')
ramdisk_out = make_fname('ramdisk-out.bin')
# Set up basic parameters with default values
params = {
'fit_addr' : 0x1000,
'kernel' : kernel,
'kernel_out' : kernel_out,
'kernel_addr' : 0x40000,
'kernel_size' : filesize(kernel),
'fdt_out' : fdt_out,
'fdt_addr' : 0x80000,
'fdt_size' : filesize(control_dtb),
'fdt_load' : '',
'ramdisk' : ramdisk,
'ramdisk_out' : ramdisk_out,
'ramdisk_addr' : 0xc0000,
'ramdisk_size' : filesize(ramdisk),
'ramdisk_load' : '',
'ramdisk_config' : '',
}
# Make a basic FIT and a script to load it
fit = make_fit(mkimage, params)
params['fit'] = fit
cmd = base_script % params
# First check that we can load a kernel
# We could perhaps reduce duplication with some loss of readability
set_test('Kernel load')
stdout = command.Output(u_boot, '-d', control_dtb, '-c', cmd)
if read_file(kernel) != read_file(kernel_out):
fail('Kernel not loaded')
if read_file(control_dtb) == read_file(fdt_out):
fail('FDT loaded but should be ignored')
if read_file(ramdisk) == read_file(ramdisk_out):
fail('Ramdisk loaded but should not be')
# Find out the offset in the FIT where U-Boot has found the FDT
line = find_matching(stdout, 'Booting using the fdt blob at ')
fit_offset = int(line, 16) - params['fit_addr']
fdt_magic = struct.pack('>L', 0xd00dfeed)
data = read_file(fit)
# Now find where it actually is in the FIT (skip the first word)
real_fit_offset = data.find(fdt_magic, 4)
if fit_offset != real_fit_offset:
fail('U-Boot loaded FDT from offset %#x, FDT is actually at %#x' %
(fit_offset, real_fit_offset))
# Now a kernel and an FDT
set_test('Kernel + FDT load')
params['fdt_load'] = 'load = <%#x>;' % params['fdt_addr']
fit = make_fit(mkimage, params)
stdout = command.Output(u_boot, '-d', control_dtb, '-c', cmd)
if read_file(kernel) != read_file(kernel_out):
fail('Kernel not loaded')
if read_file(control_dtb) != read_file(fdt_out):
fail('FDT not loaded')
if read_file(ramdisk) == read_file(ramdisk_out):
fail('Ramdisk loaded but should not be')
# Try a ramdisk
set_test('Kernel + FDT + Ramdisk load')
params['ramdisk_config'] = 'ramdisk = "ramdisk@1";'
params['ramdisk_load'] = 'load = <%#x>;' % params['ramdisk_addr']
fit = make_fit(mkimage, params)
stdout = command.Output(u_boot, '-d', control_dtb, '-c', cmd)
if read_file(ramdisk) != read_file(ramdisk_out):
fail('Ramdisk not loaded')
def run_tests():
"""Parse options, run the FIT tests and print the result"""
global base_path, base_dir
# Work in a temporary directory
base_dir = tempfile.mkdtemp()
parser = OptionParser()
parser.add_option('-u', '--u-boot',
default=os.path.join(base_path, 'u-boot'),
help='Select U-Boot sandbox binary')
parser.add_option('-k', '--keep', action='store_true',
help="Don't delete temporary directory even when tests pass")
parser.add_option('-t', '--selftest', action='store_true',
help='Run internal self tests')
(options, args) = parser.parse_args()
# Find the path to U-Boot, and assume mkimage is in its tools/mkimage dir
base_path = os.path.dirname(options.u_boot)
mkimage = os.path.join(base_path, 'tools/mkimage')
# There are a few doctests - handle these here
if options.selftest:
doctest.testmod()
return
title = 'FIT Tests'
print title, '\n', '=' * len(title)
run_fit_test(mkimage, options.u_boot)
print '\nTests passed'
print 'Caveat: this is only a sanity check - test coverage is poor'
# Remove the tempoerary directory unless we are asked to keep it
if options.keep:
print "Output files are in '%s'" % base_dir
else:
shutil.rmtree(base_dir)
run_tests()
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