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-rw-r--r--scripts/Makefile.lib17
1 files changed, 14 insertions, 3 deletions
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 2f5e28cac3..ef116e0e0a 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -395,11 +395,22 @@ $(obj)/%_efi.so: $(obj)/%.o $(obj)/efi_crt0.o $(obj)/efi_reloc.o $(obj)/efi_free
# ACPI
# ---------------------------------------------------------------------------
+#
+# This first sends the file (typically dsdt.asl) through the preprocessor
+# resolve includes and any CONFIG options used. This produces dsdt.asl.tmp
+# which is pure ASL code. The Intel ASL (ACPI (Advanced Configuration and Power
+# Interface) Source Language compiler (iasl) then converts this ASL code into a
+# C file containing the hex data to build into U-Boot. This file is called
+# dsdt.hex (despite us setting the prefix to .../dsdt.asl.tmp) so must be
+# renamed to dsdt.c for consumption by the build system.
+ASL_TMP = $(patsubst %.c,%.asl.tmp,$@)
+
quiet_cmd_acpi_c_asl= ASL $<
cmd_acpi_c_asl= \
- $(CPP) -x assembler-with-cpp -D__ASSEMBLY__ -P $(UBOOTINCLUDE) -o $<.tmp $<; \
- iasl -p $< -tc $<.tmp $(if $(KBUILD_VERBOSE:1=), >/dev/null) && \
- mv $(patsubst %.asl,%.hex,$<) $@
+ $(CPP) -x assembler-with-cpp -D__ASSEMBLY__ -P $(UBOOTINCLUDE) \
+ -o $(ASL_TMP) $< && \
+ iasl -p $@ -tc $(ASL_TMP) $(if $(KBUILD_VERBOSE:1=), >/dev/null) && \
+ mv $(patsubst %.c,%.hex,$@) $@
$(obj)/dsdt.c: $(src)/dsdt.asl
$(call cmd,acpi_c_asl)