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Date:   Sat, 16 May 2020 15:16:36 +0800
From:   Jiaxun Yang <>
To:     Tiezhu Yang <>,
        Thomas Bogendoerfer <>,
        Huacai Chen <>
        Xuefeng Li <>
Subject: Re: [PATCH] MIPS: Loongson: Add support for serial console

于 2020年5月16日 GMT+08:00 下午3:03:08, Tiezhu Yang <> 写到:
>After commit 87fcfa7b7fe6 ("MIPS: Loongson64: Add generic dts"),
>there already exists the node and property of Loongson CPU UART0
>in loongson3-package.dtsi:
>cpu_uart0: serial@...001e0 {
>        compatible = "ns16550a";
>        reg = <0 0x1fe001e0 0x8>;
>        clock-frequency = <33000000>;
>        interrupt-parent = <&liointc>;
>        interrupts = <10 IRQ_TYPE_LEVEL_HIGH>;
>        no-loopback-test;
>In order to support for serial console on the Loongson platform,
>add CONFIG_SERIAL_OF_PLATFORM=y to loongson3_defconfig.
>With this patch, we can see the following boot message:
>[    1.877745] printk: console [ttyS0] disabled
>[    1.881979] 1fe001e0.serial: ttyS0 at MMIO 0x1fe001e0 (irq = 16, base_baud = 2062500) is a 16550A
>[    1.890838] printk: console [ttyS0] enabled
>And also, we can login normally from the serial console.
>Signed-off-by: Tiezhu Yang <>
>Hi Jiaxun,
>Thank you very much for your suggestion.

Reviewed-by: Jiaxun Yang <>

Looks like we need a Kconfig clean up.
I'll do that after getting LS7A PCH support merged.

Anyway, thanks for catching this.

Jiaxun Yang

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