build: W600-SDK importiert, Firmware-Build und Hello am EVK

Docker-Build mit gcc-arm-none-eabi 4.9-2014q4 (statt Homebrew-Cask) verwendet,
Dockerfile/tools/docker.sh dafür aus Task 13 vorgezogen. cmake/sdk.cmake schont
gcc 4.9 (kennt -fcommon/-Wno-error=... nicht). Zwei zusätzliche SDK-Stubs
(EarlyInit, pre_gpio_config) in src/sys/sdk_stubs.c ergänzt, siehe sdk/PATCHES.md.

src/sys/fwup_hook_default.c

@@ -0,0 +1,10 @@
+#include "sys/nl_fwup_hook.h"
+
+/* Until OTA support (plan 3) provides a strong definition, every update is rejected. */
+__attribute__((weak)) bool nl_fwup_verify_tail(const uint8_t sha256[32], const uint8_t *tail, uint32_t tail_len)
+{
+    (void)sha256;
+    (void)tail;
+    (void)tail_len;
+    return false;
+}

src/sys/nl_fwup_hook.h

@@ -0,0 +1,12 @@
+#ifndef NL_FWUP_HOOK_H
+#define NL_FWUP_HOOK_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+/* Called by the SDK updater (sdk/Platform/Common/fwup/wm_fwup.c) after the image CRC
+ * matched. sha256 covers the T_BOOTER header plus payload, tail is the 512 byte block
+ * appended to the image. Return true to accept the image. */
+bool nl_fwup_verify_tail(const uint8_t sha256[32], const uint8_t *tail, uint32_t tail_len);
+
+#endif

src/sys/sdk_stubs.c

@@ -0,0 +1,14 @@
+/* ninlight: minimal stand-ins for the two board-init hooks that
+ * sdk/Platform/Sys/wm_main.c expects the application to provide
+ * (`extern void EarlyInit(void);` / `extern void pre_gpio_config();`).
+ * The old QConnex firmware (qconnex_sdk/src/qc_main.c) defined pre_gpio_config()
+ * as an empty no-op, and used EarlyInit() only to call into its own QConnex
+ * hardware layer (QCXH_EarlyInit()), which ninlight does not use. See sdk/PATCHES.md. */
+
+void EarlyInit(void)
+{
+}
+
+void pre_gpio_config(void)
+{
+}