We are working on an ipq8072 based router. We would like to setup 4 uart ports on this router. So far we have two uart ports working, and they are "blsp1_uart5: serial@78b3000" and "blsp1_uart2: serial@78b0000". But the other two uarrt port does not work, and they are "blsp1_uart6: serial@78b4000" and "blsp1_uart4: serial@78b2000". We are running openwrt linux_6.1.71. We are wondering if anybody tried all those uarrt ports successfully?
It appears you are using firmware that is not from the official OpenWrt project.
When using forks/offshoots/vendor-specific builds that are "based on OpenWrt", there may be many differences compared to the official versions (hosted by OpenWrt.org). Some of these customizations may fundamentally change the way that OpenWrt works. You might need help from people with specific/specialized knowledge about the firmware you are using, so it is possible that advice you get here may not be useful.
You may find that the best options are:
- Install an official version of OpenWrt, if your device is supported (see https://firmware-selector.openwrt.org).
- Ask for help from the maintainer(s) or user community of the specific firmware that you are using.
- Provide the source code for the firmware so that users on this forum can understand how your firmware works (OpenWrt forum users are volunteers, so somebody might look at the code if they have time and are interested in your issue).
If you believe that this specific issue is common to generic/official OpenWrt and/or the maintainers of your build have indicated as such, please feel free to clarify.
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We are indeed running the source code cloned from openwrt git site. The version is 6.1.71. The path that stores all dts files is as follows: "build_dir/target-aarch64_cortex-a53_musl/linux-qualcommax_ipq807x/linux-6.1.71/arch/arm64/boot/dts/qcom".
We do create our own dts to configure the unique hardware spec for our product which includes 4 uart ports. Most of the router product only include one uart port for console purpose.