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documentation: update MCUBoot documentation on ESP32-C3|C6
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Adds documentation for flash allocation when MCUBoot is enabled on ESP32C3 and C6.

Signed-off-by: Filipe Cavalcanti <filipe.cavalcanti@espressif.com>
This commit is contained in:
Filipe Cavalcanti
2025-07-25 09:08:45 -03:00
committed by Alan C. Assis
parent 42254ffcbe
commit b5f6620a4c
2 changed files with 217 additions and 0 deletions
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Documentation/platforms/risc-v/esp32c3/index.rst
+109
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@@ -600,6 +600,115 @@ to ``Application image secondary slot``.
**After disabling UART Download Mode you will not be able to flash other images through UART.**
Flash Allocation for MCUBoot
----------------------------
When MCUBoot is enabled on ESP32-C3, the flash memory is organized as follows
based on the default KConfig values:
**Flash Layout (MCUBoot Enabled)**
.. list-table::
:header-rows: 1
:widths: 40 20 20
:align: left
* - Region
- Offset
- Size
* - Bootloader
- 0x000000
- 64KB
* - E-Fuse Virtual (see Note)
- 0x010000
- 64KB
* - Primary Application Slot (/dev/ota0)
- 0x020000
- 1MB
* - Secondary Application Slot (/dev/ota1)
- 0x120000
- 1MB
* - Scratch Partition (/dev/otascratch)
- 0x220000
- 256KB
* - Storage MTD (optional)
- 0x260000
- 1MB
* - Available Flash
- 0x360000+
- Remaining
.. raw:: html
<div style="clear: both"></div>
**Note**: The E-Fuse Virtual region is optional and only used when
``ESPRESSIF_EFUSE_VIRTUAL_KEEP_IN_FLASH`` is enabled. However, this 64KB
location is always allocated in the memory layout to prevent accidental
erasure during board flashing operations, ensuring data preservation if
virtual E-Fuses are later enabled.
.. code-block:: text
Memory Map (Addresses in hex):
0x000000 ┌─────────────────────────────┐
│ │
│ MCUBoot Bootloader │
│ (64KB) │
│ │
0x010000 ├─────────────────────────────┤
│ E-Fuse Virtual │
│ (64KB) │
0x020000 ├─────────────────────────────┤
│ │
│ Primary App Slot │
│ (1MB) │
│ /dev/ota0 │
│ │
0x120000 ├─────────────────────────────┤
│ │
│ Secondary App Slot │
│ (1MB) │
│ /dev/ota1 │
│ │
0x220000 ├─────────────────────────────┤
│ │
│ Scratch Partition │
│ (256KB) │
│ /dev/otascratch │
│ │
0x260000 ├─────────────────────────────┤
│ │
│ Storage MTD (optional) │
│ (1MB) │
│ │
0x360000 ├─────────────────────────────┤
│ │
│ Available Flash │
│ (Remaining) │
│ │
└─────────────────────────────┘
The key KConfig options that control this layout:
- ``ESPRESSIF_OTA_PRIMARY_SLOT_OFFSET`` (default: 0x20000)
- ``ESPRESSIF_OTA_SECONDARY_SLOT_OFFSET`` (default: 0x120000)
- ``ESPRESSIF_OTA_SLOT_SIZE`` (default: 0x100000)
- ``ESPRESSIF_OTA_SCRATCH_OFFSET`` (default: 0x220000)
- ``ESPRESSIF_OTA_SCRATCH_SIZE`` (default: 0x40000)
- ``ESPRESSIF_STORAGE_MTD_OFFSET`` (default: 0x260000 when MCUBoot enabled)
- ``ESPRESSIF_STORAGE_MTD_SIZE`` (default: 0x100000)
For MCUBoot operation:
- The **Primary Slot** contains the currently running application
- The **Secondary Slot** receives OTA updates
- The **Scratch Partition** is used by MCUBoot for image swapping during updates
- MCUBoot manages image validation, confirmation, and rollback functionality
_`Managing esptool on virtual environment`
==========================================