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authorMartin Roth <martinroth@google.com>2015-12-11 11:40:06 -0700
committerMartin Roth <martinroth@google.com>2015-12-17 18:59:56 +0100
commitfdaf9cca3663423453e3f1988832a6e267a024b6 (patch)
tree2202c05ce9a6ed9bff7398916747b7a6feb2104f
parentffcd9393a41e20883c219a2f47a1510aef82dcd4 (diff)
downloadcoreboot-fdaf9cca3663423453e3f1988832a6e267a024b6.tar.xz
Makefile.inc: Document extract_nth and the fields it extracts
Change-Id: I0b5cffff95aca0ea0d6302b436797dada1850ba0 Signed-off-by: Martin Roth <martinroth@google.com> Reviewed-on: https://review.coreboot.org/12713 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
-rw-r--r--Makefile.inc27
1 files changed, 27 insertions, 0 deletions
diff --git a/Makefile.inc b/Makefile.inc
index 603be00893..976280cb13 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -600,6 +600,33 @@ $(objcbfs)/%.elf: $(objcbfs)/%.debug
# Build the final rom image
###########################################################################
+# extract_nth - Return a subsection of the $file string
+#
+# the input string looks like this:
+# ./build/cbfs/fallback/romstage.elf|fallback/romstage|stage|none||64|--xip*-S*.car.data*-P*0x10000
+#
+# Sections:
+# 1 - Path and name of file [FILENAME: Added to cbfs-files-y list variable]
+# 2 - Name of file in cbfs [$(FILENAME)-file]
+# 3 - File type: [$(FILENAME)-type]
+# bootblock, cbfs header, stage, payload, optionrom, bootsplash, raw, vsa,
+# mbi, microcode, fsp, mrc, cmos_default, cmos_layout, spd, mrc_cache,
+# mma, efi, deleted, null
+# 4 - Compression type [$(FILENAME)-compression]
+# none, LZMA
+# 5 - Base address [$(FILANAME)-position]
+# 6 - Alignment [$(FILENAME)-align]
+# 7 - cbfstool flags [$(FILENAME)-options]
+#
+# Input:
+# $(1) = Section to extract
+# $(2) = Input string
+#
+# Steps:
+# 1) replace all '|' characters with the sequence '- -' within the full string, prepended and appended with the character '-'
+# 2) extract the specified section from the string - this gets us the section surrounded by '-' characters
+# 3) remove the leading and trailing '-' characters
+# 4) replace all '*' characters with spaces
extract_nth=$(subst *,$(spc),$(patsubst -%-,%,$(word $(1), $(subst |,- -,-$(2)-))))
cbfs-add-cmd = \