From 23ed4efea33ceff9b1a4b2413186195a8caf5d6d Mon Sep 17 00:00:00 2001
From: Dmitry Ilyin <dima@doty.ru>
Date: Sun, 14 Aug 2022 12:52:36 +0300
Subject: [PATCH] Infer PLATFORM variable in make when nothing is provided

---
 Makefile | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Makefile b/Makefile
index da1e2662..2469728e 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,22 @@
 ROOT_DIR      := $(CURDIR)
 BR_VER        := 2021.02.12
 BR_DIR        := $(ROOT_DIR)/buildroot-$(BR_VER)
+
+ifeq ($(PLATFORM),)
+    ifeq ($(BOARD),)
+		BOARD = $(error BOARD must be set)
+    endif
+
+	FULL_PATH := $(shell find br-ext-chip-* -name "$(BOARD)*_defconfig")
+	ifeq ($(FULL_PATH),)
+		FULL_PATH := $(error Cannot find anything for $(BOARD))
+	else ifneq ($(shell echo $(FULL_PATH) | wc -w), 1)
+		FULL_PATH := $(error For provided '$(BOARD)' multiple options found: $(FULL_PATH))
+	endif
+
+	PLATFORM := $(shell echo $(FULL_PATH) | cut -d '/' -f 1 | cut -d '-' -f 4 )
+endif
+
 BR_EXT_DIR    := $(ROOT_DIR)/br-ext-chip-$(PLATFORM)
 SCRIPTS_DIR   := $(ROOT_DIR)/scripts
 #BOARDS       := $(shell ls -1 $(BR_EXT_DIR)/configs)