64 lines
2.5 KiB
ReStructuredText
64 lines
2.5 KiB
ReStructuredText
=================
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Open Flash Loader
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=================
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Introduce
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=====================================
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Open Flash loader is an implementation in NuttX that bridges the device
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drivers in NuttX with the programming methods of a flash loader in J-Link.
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It allows J-Link to program any supported NuttX device driver.
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CONFIGURATION
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===============
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.. code-block:: c
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CONFIG_DISABLE_IDLE_LOOP=y
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CONFIG_SYSTEM_OFLOADER=y
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CONFIG_SYSTEM_OFLOADER_TABLE="/dev/flash,0x08000000,0x20000"，0
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```CONFIG_DISABLE_IDLE_LOOP`` is used to disable the idle loop in NuttX.
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```CONFIG_SYSTEM_OFLOADER``` is used to enable the Open Flash Loader.
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```CONFIG_SYSTEM_OFLOADER_TABLE``` is used to configure the flash device
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frist parameter is the device name, second parameter is the start address.
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The reference configuration "stm32f429i-disco:ofloader" is designed
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to be used with the STM32F429I-DISCO board in NuttX,
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enabling the Open Flash loader functionality. This configuration allows
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the J-Link flash loader to program the NuttX image onto the STM32F429I-DISCO board.
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Usage
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=====
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1. Build NuttX with Open Flash Loader.
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2. Configure the Jlink xml file. like
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.. code-block::
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<Database>
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<Device>
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<ChipInfo Vendor="STM32NUTTX" Name="NuttX" Core="JLINK_CORE_CORTEX_M4" WorkRAMAddr="0x20000000" WorkRAMSize="0x10000000" />
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<FlashBankInfo Name="Storage" BaseAddr="0x00000000" MaxSize="0xffffffff" Loader="/home/ajh/work/vela_all/nuttx/nuttx" LoaderType="FLASH_ALGO_TYPE_OPEN" AlwaysPresent="1"/>
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</Device>
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</Database>
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3. Use ``JLinkExe -if SWD -speed 4000 -device STM32NUTTX``,
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then ``loadbin /home/ajh/work/nuttx.bin 0x08000000``,
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we can flash nuttx.bin to /dev/flash
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Precautions
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===========
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1.If you need to implement the ofloader on a different board,
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you will need to read the `wiki <https://wiki.segger.com/SEGGER_Flash_Loader>`
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and refer to the implementation of "ofloader.ld" linker script located
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in the "boards/arm/stm32/stm32f429i-disco/scripts" directory.
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This linker script defines how the different sections of the NuttX image are placed in memory.
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You should configure the corresponding sections to be located in RAM,
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where the J-Link can write the image correctly.
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2.When running the ofloader, J-Link disables any interrupts by default.
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Therefore, currently, it does not support programming devices with interrupt-driven drivers.
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3.Due to limitations of J-Link, the ofloader image file cannot exceed 64KB.
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It is essential to be mindful of this constraint during programming.
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