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cpu: create an empty file when no microcode files are given 

Having an empty microcode file makes it more easy to debug
in comparison to a not existing file in cbfs. There are some
platforms (e.g. ep80579) which support microcode updates but
not having any microcode updates yet in our tree.

These platform hang the build because `cat` is called with no
parameters.

Change-Id: I2699bde0c62ae62ca888686f8b496e845c36d970
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-on: http://review.coreboot.org/12109
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Alexander Couzens 2015-10-21 12:02:39 +02:00 committed by Nico Huber
parent c19f876e94
commit d1adafec05
1 changed files with 1 additions and 1 deletions
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2
src/cpu/Makefile.inc
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@ -40,7 +40,7 @@ endif
$(obj)/cpu_microcode_blob.bin: $$(cpu_microcode_bins)
@printf " MICROCODE $(subst $(obj)/,,$(@))\n"
@echo $(cpu_microcode_bins)
cat $+ > $@
cat /dev/null $+ > $@
cbfs-files-$(cbfs_include_ucode) += cpu_microcode_blob.bin
cpu_microcode_blob.bin-file := $(cpu_ucode_cbfs_file)