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| − | {{rockpi4_header}}
| + | #redirect [[Rockpi4/dev/use-uart2-as-application-uart]] |
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| − | {{Languages|rockpiS/dev/}}
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| − | [[rockpi4 | ROCK Pi 4]] > [[rockpi4/dev | Development]] > [[Rockpi4/dev/use-uart-with-kernel-5.10 | Use Uart with Kernel 5.10]]
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| − | ===Description===
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| − | If you want to use uart with Kernel 5.10 in ROCK Pi 4. You'd better follow these steps.
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| − | ==== Install essential package ====
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| − | sudo apt-get install -y rockpi4-dtbo
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| − | ==== UART ====
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| − | Modify file /boot/hw_intfc.conf. Set "on" to enable the optional hardware interfaces while set "off" to disable.
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| − | intfc:uart2=on
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| − | intfc:uart4=on
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| − | And add "#" to line "intfc:dtoverlay=console-on-ttyS2"
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| − | #intfc:dtoverlay=console-on-ttyS2
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| − | #intfc:dtoverlay=console-on-ttyS4
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| − | but now, the uart2 can still be used as a debug port with system log. If you don't want to output kernel messages, you can disable it as follow.
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| − | Modify file /boot/extlinux/extlinux.conf.
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| − | append earlyprintk console=ttyFIQ0,1500000n8 rw init=/sbin/init rootfstype=ext4 rootwait root=UUID=8650cdca-49b0-4431-9667-5c639f6bab89 console=ttyS2,1500000n8
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| − | Delete strings '''console=ttyFIQ0,1500000n8''' and '''console=ttyS2,1500000n8''' in this line.
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| − | append earlyprintk rw init=/sbin/init rootfstype=ext4 rootwait root=UUID=8650cdca-49b0-4431-9667-5c639f6bab89
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