[U-Boot] [PATCH v2] arm64: zynqmp: accept an absolute path for PMUFW_INIT_FILE

[Luca Ceresoli]

The value of PMUFW_INIT_FILE is prefixed with "$(srctree)/", thus
forcing it to be a relative path inside the U-Boot source tree. Since
the PMUFW is a binary file generated outside of U-Boot, the PMUFW
binary must be copied inside the U-Boot source tree before the
build.

This generates a few problems:

 * if the source tree is shared among different out-of-tree builds,
   they will pollute (and potentially corrupt) each other
 * the source tree cannot be read-only
 * any buildsystem must add a command to copy the PMUFW binary
 * putting an externally-generated binary in the source tree is ugly
   as hell

Avoid these problems by accepting an absolute path for
PMUFW_INIT_FILE. This would be as simple as removing the "$(srctree)/"
prefix, but in order to keep backward compatibility we rather use the
shell and readlink to get the absolute path even when starting from a
relative path.

Since 'readlink -f' produces an empty string if the file does not
exist, we also add a check to ensure the file configured in
PMUFW_INIT_FILE exists. Otherwise the build would exit successfully,
but produce a boot.bin without PMUFW as if PMUFW_INIT_FILE were empty.

Tested in the 12 possible combinations of:
 - PMUFW_INIT_FILE empty, relative, absolute, non-existing
 - building in-tree, in subdir, in other directory

Signed-off-by: Luca Ceresoli <luca at lucaceresoli.net>
Cc: Michal Simek <michal.simek at xilinx.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Emmanuel Vadot <manu at bidouilliste.com>

---

Changes v1 -> v2:
 - avoid non-portable 'readlink -m' by adding an explicit check to
   ensure the file exists
 - test also the case where PMUFW_INIT_FILE points to a non-existing
   file
---
 scripts/Makefile.spl | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index 057389997de6..08660878b49e 100644
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -167,8 +167,14 @@ ifdef CONFIG_ARCH_ZYNQ
 MKIMAGEFLAGS_boot.bin = -T zynqimage -R $(srctree)/$(CONFIG_BOOT_INIT_FILE)
 endif
 ifdef CONFIG_ARCH_ZYNQMP
+ifneq ($(CONFIG_PMUFW_INIT_FILE),"")
+spl/boot.bin: zynqmp-check-pmufw
+zynqmp-check-pmufw: FORCE
+	( cd $(srctree) && test -r $(CONFIG_PMUFW_INIT_FILE) ) \
+		|| ( echo "Cannot read $(CONFIG_PMUFW_INIT_FILE)" && false )
+endif
 MKIMAGEFLAGS_boot.bin = -T zynqmpimage -R $(srctree)/$(CONFIG_BOOT_INIT_FILE) \
-	-n $(srctree)/$(CONFIG_PMUFW_INIT_FILE)
+	-n "$(shell cd $(srctree); readlink -f $(CONFIG_PMUFW_INIT_FILE))"
 endif
 
 spl/boot.bin: $(obj)/u-boot-spl.bin FORCE
-- 
2.7.4