--- firmware/Makefile

+++ firmware/Makefile

@@ -140,7 +140,7 @@ fw-shipped-$(CONFIG_YAM) += yam/1200.bin

fw-shipped-all := $(fw-shipped-y) $(fw-shipped-m) $(fw-shipped-)

# Directories which we _might_ need to create, so we have a rule for them.

-firmware-dirs := $(sort $(patsubst %,$(objtree)/$(obj)/%/,$(dir $(fw-external-y) $(fw-shipped-all))))

+firmware-dirs := $(sort $(addprefix $(objtree)/$(obj)/,$(dir $(fw-external-y) $(fw-shipped-all))))

quiet_cmd_mkdir = MKDIR $(patsubst $(objtree)/%,%,$@)

cmd_mkdir = mkdir -p $@