diff options
| -rw-r--r-- | Makefile | 30 | ||||
| -rw-r--r-- | doc/build/gcc.rst | 21 | ||||
| -rw-r--r-- | dts/Kconfig | 4 | ||||
| -rw-r--r-- | scripts/Makefile | 1 | ||||
| -rwxr-xr-x | scripts/dtc-version.sh | 7 |
5 files changed, 55 insertions, 8 deletions
@@ -415,7 +415,13 @@ PERL = perl PYTHON ?= python PYTHON2 = python2 PYTHON3 ?= python3 -DTC ?= $(objtree)/scripts/dtc/dtc + +# The devicetree compiler and pylibfdt are automatically built unless DTC is +# provided. If DTC is provided, it is assumed the pylibfdt is available too. +DTC_INTREE := $(objtree)/scripts/dtc/dtc +DTC ?= $(DTC_INTREE) +DTC_MIN_VERSION := 010406 + CHECK = sparse CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ @@ -1954,9 +1960,29 @@ endif endif +# Check dtc and pylibfdt, if DTC is provided, else build them PHONY += scripts_dtc scripts_dtc: scripts_basic - $(Q)$(MAKE) $(build)=scripts/dtc + $(Q)if test "$(DTC)" = "$(DTC_INTREE)"; then \ + $(MAKE) $(build)=scripts/dtc; \ + else \ + if ! $(DTC) -v >/dev/null; then \ + echo '*** Failed to check dtc version: $(DTC)'; \ + false; \ + else \ + if test "$(call dtc-version)" -lt $(DTC_MIN_VERSION); then \ + echo '*** Your dtc is too old, please upgrade to dtc $(DTC_MIN_VERSION) or newer'; \ + false; \ + else \ + if [ -n "$(CONFIG_PYLIBFDT)" ]; then \ + if ! echo "import libfdt" | $(PYTHON3) 2>/dev/null; then \ + echo '*** pylibfdt does not seem to be available with $(PYTHON3)'; \ + false; \ + fi; \ + fi; \ + fi; \ + fi; \ + fi # --------------------------------------------------------------------------- quiet_cmd_cpp_lds = LDS $@ diff --git a/doc/build/gcc.rst b/doc/build/gcc.rst index 0cdc307d57..6c4b4ad7a0 100644 --- a/doc/build/gcc.rst +++ b/doc/build/gcc.rst @@ -120,6 +120,27 @@ Further important build parameters are * O=<dir> - generate all output files in directory <dir>, including .config * V=1 - verbose build +Devicetree compiler +~~~~~~~~~~~~~~~~~~~ + +Boards that use `CONFIG_OF_CONTROL` (i.e. almost all of them) need the +devicetree compiler (dtc). Those with `CONFIG_PYLIBFDT` need pylibfdt, a Python +library for accessing devicetree data. Suitable versions of these are included +in the U-Boot tree in `scripts/dtc` and built automatically as needed. + +To use the system versions of these, use the DTC parameter, for example + +.. code-block:: bash + + DTC=/usr/bin/dtc make + +In this case, dtc and pylibfdt are not built. The build checks that the version +of dtc is new enough. It also makes sure that pylibfdt is present, if needed +(see `scripts_dtc` in the Makefile). + +Note that the :doc:`tools` are always built with the included version of libfdt +so it is not possible to build U-Boot tools with a system libfdt, at present. + Other build targets ~~~~~~~~~~~~~~~~~~~ diff --git a/dts/Kconfig b/dts/Kconfig index fc4130545a..90c7a1c5f4 100644 --- a/dts/Kconfig +++ b/dts/Kconfig @@ -5,9 +5,6 @@ config SUPPORT_OF_CONTROL bool -config DTC - bool - config PYLIBFDT bool @@ -42,7 +39,6 @@ menu "Device Tree Control" config OF_CONTROL bool "Run-time configuration via Device Tree" - select DTC select OF_LIBFDT if !OF_PLATDATA select OF_REAL if !OF_PLATDATA help diff --git a/scripts/Makefile b/scripts/Makefile index e7b353f77f..cfe9fef804 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -10,4 +10,3 @@ always := $(hostprogs-y) # Let clean descend into subdirs subdir- += basic kconfig -subdir-$(CONFIG_DTC) += dtc diff --git a/scripts/dtc-version.sh b/scripts/dtc-version.sh index bd4e818e92..bfb514e179 100755 --- a/scripts/dtc-version.sh +++ b/scripts/dtc-version.sh @@ -10,11 +10,16 @@ dtc="$*" if [ ${#dtc} -eq 0 ]; then - echo "Error: No dtc command specified." + echo "Error: No dtc command specified" printf "Usage:\n\t$0 <dtc-command>\n" exit 1 fi +if ! which $dtc >/dev/null ; then + echo "Error: Cannot find dtc: $dtc" + exit 1 +fi + MAJOR=$($dtc -v | head -1 | awk '{print $NF}' | cut -d . -f 1) MINOR=$($dtc -v | head -1 | awk '{print $NF}' | cut -d . -f 2) PATCH=$($dtc -v | head -1 | awk '{print $NF}' | cut -d . -f 3 | cut -d - -f 1) |