### MfgTool
DTB Usage and Configuration
MfgTool, commonly used for programming and configuring embedded devices such as those based on NXP i.MX processors, supports Device Tree Binary (
DTB) files during the boot process. A device tree binary file describes hardware components connected to a processor or SoC without requiring changes to the operating system source code.
For mfgtool operations involving
DTBs:
A bootloader must place a device tree image (
dtb) into system RAM at an address aligned to 64 bits and initialize this memory region with necessary boot parameters[^2]. This preparation ensures that when the
kernel starts executing, it can locate the start marker `0xd00dfeed` within the provided
dtb location to confirm presence of valid device tree information rather than expecting traditional tagged lists.
Incorporating these principles into practical use cases through mfgtool involves specifying paths to appropriate .
dtb files alongside other required binaries like u-boot images or Linux
kernels via configuration scripts tailored specifically towards target platforms supported by mfgtool.
To configure mfgTool correctly for using custom-built
DTBs:
Ensure the generated `.
dtb` file matches exactly what was compiled from corresponding
dts sources intended for your specific board setup. Place this file along with any additional resources needed during flashing processes inside designated directories referenced within project settings files utilized by mfgtool.
Below demonstrates how one might structure commands related to loading both U-Boot SPL/
UBOOT plus associated
DTB while ensuring alignment requirements are met before handing control over to subsequent stages after power-on reset sequence completes successfully.
```bash
# Example command line arguments passed to mfgtool
mfgtool --fdt=my_custom_board.
dtb \
--loadaddr=<physical_address_for_
dtb>
```
This script snippet assumes existence of precompiled artifacts (`U_BOOT_SPL`, `uImage`) together with properly constructed device tree blob named `my_custom_board.
dtb`. Adjust `<physical_address_for_
dtb>` according to actual platform specifications regarding where in physical address space the
dtb should reside upon being loaded into RAM prior to invocation of next stage loaders.
--related questions--
1. How does one compile
DTS files into
DTB format suitable for deployment
?
2. What tools besides mfgtool offer similar functionality concerning firmware updates incorporating
DTBs
?
3. Can you provide examples demonstrating integration between Yocto Project builds and mfgtool workflows including handling of
DTBs
?
4. Are there best practices recommended when modifying existing device trees versus creating entirely new ones
?
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