On 03/30/2021 09:48 AM, Jiaxun Yang wrote:

On Mon, Mar 29, 2021, at 3:15 PM, Qing Zhang wrote:

quoted

When using the Loongson-3A4000 machine for serial port debugging,
there is no /dev/ttyUSB* output, which makes the serial port unavailable,
For convenience, we open this configuration.

zhangqing@loongson-pc:~$ cat /sys/firmware/lefi/boardinfo
Board Info
Manufacturer		: THTF
Board Name		: THTF-LS3A4000-7A1000-ML4A
Family			: LOONGSON3

BIOS Info
Vendor			: ZD tech
Version			: ZD tech-V2.1.1
ROM Size		: 4 KB
Release Date		: 2020-06-29

zhangqing@loongson-pc:~$ lsusb
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 003: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
Bus 005 Device 002: ID 0c45:760b Microdia USB Keyboard
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 003: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Signed-off-by: Qing Zhang <redacted>

Please, don't add random stuff to defconfig.
Carry it locally in your config as the device doesn't come with the borad, it's your accessory.

Hi, jiaxun

Thank you for your reply:-)，

PL2303 is a commonly used accessory,

I see that other platforms are turned on by default, so I also enabled it.

eg:

arch/powerpc/configs/g5_defconfig:191:CONFIG_USB_SERIAL_PL2303=m
arch/powerpc/configs/ppc6xx_defconfig:902:CONFIG_USB_SERIAL_PL2303=m
arch/mips/configs/rm200_defconfig:310:CONFIG_USB_SERIAL_PL2303=m
arch/mips/configs/loongson3_defconfig:323:CONFIG_USB_SERIAL_PL2303=m
arch/mips/configs/mtx1_defconfig:559:CONFIG_USB_SERIAL_PL2303=m
arch/mips/configs/pistachio_defconfig:240:CONFIG_USB_SERIAL_PL2303=m
arch/mips/configs/loongson1c_defconfig:88:CONFIG_USB_SERIAL_PL2303=m
arch/mips/configs/loongson1b_defconfig:87:CONFIG_USB_SERIAL_PL2303=m
arch/arm/configs/spitz_defconfig:183:CONFIG_USB_SERIAL_PL2303=m
arch/arm/configs/s3c2410_defconfig:323:CONFIG_USB_SERIAL_PL2303=y
arch/arm/configs/omap2plus_defconfig:430:CONFIG_USB_SERIAL_PL2303=m
arch/arm/configs/at91_dt_defconfig:166:CONFIG_USB_SERIAL_PL2303=y
arch/arm/configs/s3c6400_defconfig:57:CONFIG_USB_SERIAL_PL2303=m
arch/arm/configs/corgi_defconfig:189:CONFIG_USB_SERIAL_PL2303=m
arch/arm/configs/sama5_defconfig:183:CONFIG_USB_SERIAL_PL2303=y
arch/arm/configs/pxa_defconfig:572:CONFIG_USB_SERIAL_PL2303=m
arch/arm/configs/ep93xx_defconfig:101:CONFIG_USB_SERIAL_PL2303=y
arch/arm/configs/omap1_defconfig:185:CONFIG_USB_SERIAL_PL2303=y
arch/arm/configs/badge4_defconfig:90:CONFIG_USB_SERIAL_PL2303=m
arch/sh/configs/landisk_defconfig:91:CONFIG_USB_SERIAL_PL2303=m
arch/sh/configs/titan_defconfig:218:CONFIG_USB_SERIAL_PL2303=m

Thanks,

Qing

Thanks.