SRCDIR    := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
TXT_FILES := $(wildcard $(SRCDIR)*.txt)
NAMES     := $(notdir $(basename $(TXT_FILES)))
OUTS      := $(addprefix out/,$(addsuffix /boot.scr,$(NAMES)))

# Default target: build everything
.PHONY: all
all: $(OUTS)

# Pattern rule
#   out/<name>/boot.scr is built from <name>.txt
out/%/boot.scr: %.txt
	@mkdir -p $(dir $@)
	mkimage -A arm -T script -O linux -d $< $@

.PHONY: clean
clean:
	rm -rf out