feat(esp32-p4): add support for flasher stub in USB OTG mode

ci/download_flasher_stubs.py

@@ -12,7 +12,7 @@ STUBS = (
         "STUB_SET_VERSION": "1",
         "DOWNLOAD_URL": "https://github.com/espressif/esptool-legacy-flasher-stub/releases/download",
         "TAG_URL": "https://github.com/espressif/esptool-legacy-flasher-stub/releases/tag",
-        "VERSION": "v1.3.0",
+        "VERSION": "v1.4.0",
         "FILE_LIST": (
             "esp32",
             "esp32c2",

esptool/targets/esp32p4.py

@@ -68,6 +68,13 @@ class ESP32P4ROM(ESP32ROM):
     PURPOSE_VAL_XTS_AES256_KEY_2 = 3
     PURPOSE_VAL_XTS_AES128_KEY = 4
 
+    USB_RAM_BLOCK = 0x800  # Max block size USB-OTG is used
+
+    GPIO_STRAP_REG = 0x500E0038
+    GPIO_STRAP_SPI_BOOT_MASK = 0x8  # Not download mode
+    RTC_CNTL_OPTION1_REG = 0x50110008
+    RTC_CNTL_FORCE_DOWNLOAD_BOOT_MASK = 0x4  # Is download mode forced over USB?
+
     SUPPORTS_ENCRYPTED_FLASH = True
 
     FLASH_ENCRYPTED_WRITE_ALIGN = 16
@@ -206,6 +213,8 @@ class ESP32P4ROM(ESP32ROM):
         ESPLoader.change_baud(self, baud)
 
     def _post_connect(self):
+        if self.uses_usb_otg():
+            self.ESP_RAM_BLOCK = self.USB_RAM_BLOCK
         if not self.sync_stub_detected:  # Don't run if stub is reused
             self.disable_watchdogs()
 
@@ -262,7 +271,7 @@ class ESP32P4ROM(ESP32ROM):
         self.write_reg(self.RTC_CNTL_WDTWPROTECT_REG, 0)  # lock
 
     def hard_reset(self):
-        if self.uses_usb_jtag_serial():
+        if self.uses_usb_jtag_serial() or self.uses_usb_otg():
             self.rtc_wdt_reset()
         else:
             ESPLoader.hard_reset(self)
@@ -286,5 +295,9 @@ class ESP32P4StubLoader(ESP32P4ROM):
         self.cache = rom_loader.cache
         self.flush_input()  # resets _slip_reader
 
+        if rom_loader.uses_usb_otg():
+            self.ESP_RAM_BLOCK = self.USB_RAM_BLOCK
+            self.FLASH_WRITE_SIZE = self.USB_RAM_BLOCK
+
 
 ESP32P4ROM.STUB_CLASS = ESP32P4StubLoader

esptool/targets/stub_flasher/1/README.md

@@ -1,3 +1,3 @@
 # Licensing
 
-The binaries in JSON format distributed in this directory are released as Free Software under GNU General Public License Version 2 or later. They were released at https://github.com/espressif/esptool-legacy-flasher-stub/releases/tag/v1.3.0 from where the sources can be obtained.
+The binaries in JSON format distributed in this directory are released as Free Software under GNU General Public License Version 2 or later. They were released at https://github.com/espressif/esptool-legacy-flasher-stub/releases/tag/v1.4.0 from where the sources can be obtained.