bootloader_support: add esp32-s3 initial support

components/esp_common/src/fpga_overrides.c

@@ -0,0 +1,57 @@
+// Copyright 2010-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include "sdkconfig.h"
+#include "soc/soc.h"
+#include "soc/system_reg.h"
+#include "soc/rtc.h"
+#include "soc/rtc_cntl_reg.h"
+#include "esp_rom_sys.h"
+#include "esp_rom_uart.h"
+
+extern void ets_update_cpu_frequency(uint32_t ticks_per_us);
+
+void bootloader_clock_configure(void)
+{
+    esp_rom_uart_tx_wait_idle(0);
+
+    uint32_t clock = 40000000;
+    ets_update_cpu_frequency(clock / 1000000);
+    REG_WRITE(RTC_CNTL_STORE5_REG, (clock >> 12) | ((clock >> 12) << 16));
+}
+
+void bootloader_fill_random(void *buffer, size_t length)
+{
+    uint8_t *buffer_bytes = (uint8_t *)buffer;
+    for (int i = 0; i < length; i++) {
+        buffer_bytes[i] = 0x5A;
+    }
+}
+
+void esp_clk_init(void)
+{
+
+}
+
+void esp_perip_clk_init(void)
+{
+
+}
+
+/**
+ * @brief No-op function, used to force linking this file
+ *
+ */
+void esp_common_include_fpga_overrides(void)
+{
+}