[Buildroot] [PATCH v5 2/3] board/versal/post-image.sh: add custom hardware support

[Neal Frager via buildroot <buildroot@buildroot.org>]

By switching to the LINUX_DTBS variable, the post-image.sh script can now
work regardless of whether a user is using BR2_LINUX_KERNEL_INTREE_DTS_NAME
or the BR2_LINUX_KERNEL_CUSTOM_DTS_DIR for custom hardware. This simplifies
the transition users will make when migrating from a versal evaluation board
to a versal custom platform.

To keep the example post-image script as simple as possible, it assumes that
the first DTB in the LINUX_DTBS list is the one for creating the system.dtb
filename that u-boot will use for booting. Users are free to implement their
own post-image scripts for use cases with multiple DTBs.

Signed-off-by: Neal Frager <neal.frager@amd.com>
---
V1->V2:
- removed unnecessary $BINARIES_DIR from symlink source
V2->V3:
- ignore anything after the first space char of LINUX_DTBS
V3->V4:
- use make print-vars to get LINUX_DTBS variable
V4->V5:
- fixed shellcheck issue
---
 board/versal/post-image.sh | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/board/versal/post-image.sh b/board/versal/post-image.sh
index 3242e4384a..4a810ff15b 100755
--- a/board/versal/post-image.sh
+++ b/board/versal/post-image.sh
@@ -2,13 +2,9 @@
 
 # By default U-Boot loads DTB from a file named "system.dtb", so
 # let's use a symlink with that name that points to the *first*
-# devicetree listed in the config.
-
-FIRST_DT=$(sed -nr \
-               -e 's|^BR2_LINUX_KERNEL_INTREE_DTS_NAME="(xilinx/)?([-_/[:alnum:]\\.]*).*"$|\2|p' \
-               "${BR2_CONFIG}")
-
-[ -z "${FIRST_DT}" ] || ln -fs "${FIRST_DT}.dtb" "${BINARIES_DIR}/system.dtb"
+# devicetree in the LINUX_DTBS list.
+LINUX_DTBS="$(make --no-print-directory VARS=LINUX_DTBS printvars)"
+ln -fs "$(basename "${LINUX_DTBS%% *}")" "${BINARIES_DIR}/system.dtb"
 
 BOARD_DIR="$(dirname "$0")"
 
-- 
2.25.1

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