- 如何查看编译生成的设备树的内容？
在设备树学习的时候，如果可以看到最终生成的设备树的内容，对于我们学习设备树以及分析问题有很大帮助。这里我们需要使用设备树生成工具dtc的反汇编功能
[email protected]:~/tq2440/Linux/linux-4.0.1# ./scripts/dtc/dtc -h
Usage: dtc [options] <input file>
Options: -[qI:O:o:V:d:R:S:p:fb:i:H:sW:E:hv]
-q, --quiet
Quiet: -q suppress warnings, -qq errors, -qqq all
-I, --in-format <arg>
Input formats are:
dts - device tree source text
dtb - device tree blob
fs - /proc/device-tree style directory
-o, --out <arg>
Output file
-O, --out-format <arg>
Output formats are:
dts - device tree source text
dtb - device tree blob
asm - assembler source
-V, --out-version <arg>
Blob version to produce, defaults to %d (for dtb and asm output)
-d, --out-dependency <arg>
Output dependency file
-R, --reserve <arg>
tMake space for <number> reserve map entries (for dtb and asm output)
-S, --space <arg>
Make the blob at least <bytes> long (extra space)
-p, --pad <arg>
Add padding to the blob of <bytes> long (extra space)
-b, --boot-cpu <arg>
Set the physical boot cpu
-f, --force
Try to produce output even if the input tree has errors
-i, --include <arg>
Add a path to search for include files
-s, --sort
Sort nodes and properties before outputting (useful for comparing trees)
-H, --phandle <arg>
Valid phandle formats are:
legacy - "linux,phandle" properties only
epapr - "phandle" properties only
both - Both "linux,phandle" and "phandle" properties
-W, --warning <arg>
Enable/disable warnings (prefix with "no-")
-E, --error <arg>
Enable/disable errors (prefix with "no-")
-h, --help
Print this help and exit
-v, --version
Print version and exit
假设我们最终的设备树文件是：arch/arm/boot/dts/s3c2416-smdk2416.dtb
./scripts/dtc/dtc -I dtb -O dts -o output.dts arch/arm/boot/dts/s3c2416-smdk2416.dtb
输出文件output.dts就是反汇编的结果，他就是实际生成的设备树。
- Linux配置，支持设备树
make menuconfig ---> Boot options ---> Flattened Device Tree support
- Linux 编译设备树
可以看看arch/arm/boot/dts/Makefile中你要的那个设备树的dtb文件是否配置上了。
make dtbs
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时间： 2024-10-30 04:15:13