upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/tools/scripts/define2mk.sed

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#
# Sed script to parse CPP macros and generate output usable by make
#
# It is expected that this script is fed the output of 'gpp -dM'
# which preprocesses the common.h header files and outputs the final
# list of CPP macros (and whitespace is sanitized)
#
# Only process values prefixed with #define CONFIG_
/^#define CONFIG_[A-Za-z0-9_][A-Za-z0-9_]*/ {
# Strip the #define prefix
s/#define *//;
# Change to form CONFIG_*=VALUE
s/ */=/;
# Drop trailing spaces
s/ *$//;
# drop quotes around string values
s/="\(.*\)"$/=\1/;
# Concatenate string values
s/" *"//g;
# Assume strings as default - add quotes around values
s/=\(..*\)/="\1"/;
# but remove again from decimal numbers
s/="\([0-9][0-9]*\)"/=\1/;
# ... and from hex numbers
s/="\(0[Xx][0-9a-fA-F][0-9a-fA-F]*\)"/=\1/;
# ... and from configs defined from other configs
s/="\(CONFIG_[A-Za-z0-9_][A-Za-z0-9_]*\)"/=$(\1)/;
# Change '1' and empty values to "y" (not perfect, but
# supports conditional compilation in the makefiles
s/=$/=y/;
s/=1$/=y/;
# print the line
p
}