Add Support for CH579M

os/common/startup/ARMCMx/compilers/GCC/mk/startup_ch579m.mk

@@ -0,0 +1,30 @@
+# CH579M startup files (ARM Cortex-M0, ARMv6-M).
+#
+# Uses the generic ChibiOS ARMv6-M startup (crt0_v6m.S + vectors.S)
+# with WCH's CH579M CMSIS device header for the vector table layout.
+#
+# The system_ch579m.c provides SystemInit() which is called from crt0;
+# our hal_lld_init() then does the PLL switch in __early_init().
+
+STARTUPSRC = $(CHIBIOS)/os/common/startup/ARMCMx/compilers/GCC/crt1.c
+
+STARTUPASM = $(CHIBIOS)/os/common/startup/ARMCMx/compilers/GCC/crt0_v6m.S \
+             $(CHIBIOS)/os/common/startup/ARMCMx/compilers/GCC/vectors.S
+
+STARTUPINC = $(CHIBIOS)/os/common/portability/GCC \
+             $(CHIBIOS)/os/common/startup/ARMCMx/compilers/GCC \
+             $(CHIBIOS)/os/common/startup/ARMCMx/compilers/GCC/ld \
+             $(CHIBIOS)/os/common/ext/ARM/CMSIS/Core/Include \
+             $(CHIBIOS_CONTRIB)/os/common/startup/ARMCMx/devices/CH579 \
+             $(CHIBIOS_CONTRIB)/os/hal/ports/WCH/CH579 \
+             $(KEYBOARD_PATH_1)/ld
+
+STARTUPLD         = $(CHIBIOS)/os/common/startup/ARMCMx/compilers/GCC/ld
+STARTUPLD_CONTRIB = $(KEYBOARD_PATH_1)/ld
+
+LDFLAGS += -L$(KEYBOARD_PATH_1)/ld
+
+# Shared variables
+ALLXASMSRC += $(STARTUPASM)
+ALLCSRC    += $(STARTUPSRC)
+ALLINC     += $(STARTUPINC)

os/common/startup/ARMCMx/devices/CH579/cmparams.h

@@ -0,0 +1,48 @@
+/*
+ * ChibiOS - CH579M Cortex-M0 CMSIS parameters
+ *
+ * CH579M interrupt vector count: 26 external IRQs from the datasheet,
+ * rounded up to the next multiple of 8 → 32.
+ */
+
+#ifndef CMPARAMS_H
+#define CMPARAMS_H
+
+/** @brief Cortex core model: 0 = Cortex-M0. */
+#define CORTEX_MODEL 0
+
+/** @brief No FPU on Cortex-M0. */
+#define CORTEX_HAS_FPU 0
+
+/**
+ * @brief Number of bits in priority masks.
+ * @note  Cortex-M0 only implements the top 2 bits of the priority field.
+ */
+#define CORTEX_PRIORITY_BITS 2
+
+/**
+ * @brief Number of interrupt vectors.
+ * @note  Does NOT include the 16 system vectors.  Must be a multiple of 8.
+ *        CH579M has 26 external IRQs → rounded to 32.
+ */
+#define CORTEX_NUM_VECTORS 32
+
+#if !defined(_FROM_ASM_)
+
+#include "board.h"
+
+/* Pull in the device register header solely to verify parameters match. */
+#include "CH579.h"
+
+#if CORTEX_MODEL != __CORTEX_M
+#error "CMSIS __CORTEX_M mismatch — verify CH579.h defines __CORTEX_M 0"
+#endif
+
+#if CORTEX_PRIORITY_BITS != __NVIC_PRIO_BITS
+#error                                                                         \
+    "CMSIS __NVIC_PRIO_BITS mismatch — verify CH579.h defines __NVIC_PRIO_BITS 2"
+#endif
+
+#endif /* !defined(_FROM_ASM_) */
+
+#endif /* CMPARAMS_H */