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问题：[求助]Openwrt MT7620A 第二个串口打开
描述:
如下为板子启动过程，
描述:
openwrtuart
如下为板子启动过程，
..............................省略无关信息..............................
[ 0.070000] pinctrl core: registered pin 69 (io69) on rt2880-pinmux
[ 0.070000] pinctrl core: registered pin 70 (io70) on rt2880-pinmux
[ 0.070000] pinctrl core: registered pin 71 (io71) on rt2880-pinmux
[ 0.070000] pinctrl core: registered pin 72 (io72) on rt2880-pinmux
[ 0.070000] pinctrl core: add 5 pinmux maps
[ 0.070000] rt2880-pinmux pinctrl: found group selector 11 for wled
[ 0.070000] rt2880-pinmux pinctrl: found group selector 13 for pa
[ 0.070000] rt2880-pinmux pinctrl: found group selector 0 for i2c
[ 0.070000] rt2880-pinmux pinctrl: found group selector 4 for wdt
[ 0.070000] rt2880-pinmux pinctrl: found group selector 1 for uartf
[ 0.070000] rt2880-pinmux pinctrl: request pin 72 (io72) for pinctrl
[ 0.070000] rt2880-pinmux pinctrl: wled(11),gpio(0) = a311d
[ 0.080000] rt2880-pinmux pinctrl: request pin 18 (io18) for pinctrl
[ 0.080000] rt2880-pinmux pinctrl: request pin 19 (io19) for pinctrl
[ 0.080000] rt2880-pinmux pinctrl: request pin 20 (io20) for pinctrl
[ 0.080000] rt2880-pinmux pinctrl: request pin 21 (io21) for pinctrl
[ 0.080000] rt2880-pinmux pinctrl: pa(13),gpio(0) = 1a311d
[ 0.080000] rt2880-pinmux pinctrl: request pin 1 (io1) for pinctrl
[ 0.080000] rt2880-pinmux pinctrl: request pin 2 (io2) for pinctrl
[ 0.080000] rt2880-pinmux pinctrl: i2c(0),gpio(0) = 1a311d
[ 0.090000] rt2880-pinmux pinctrl: request pin 17 (io17) for pinctrl
[ 0.090000] rt2880-pinmux pinctrl: wdt(4),gpio(0) = 5a311d
[ 0.090000] rt2880-pinmux pinctrl: request pin 7 (io7) for pinctrl
[ 0.090000] rt2880-pinmux pinctrl: request pin 8 (io8) for pinctrl
[ 0.090000] rt2880-pinmux pinctrl: request pin 9 (io9) for pinctrl
[ 0.090000] rt2880-pinmux pinctrl: request pin 10 (io10) for pinctrl
[ 0.090000] rt2880-pinmux pinctrl: request pin 11 (io11) for pinctrl
[ 0.090000] rt2880-pinmux pinctrl: request pin 12 (io12) for pinctrl
[ 0.090000] rt2880-pinmux pinctrl: request pin 13 (io13) for pinctrl
[ 0.090000] rt2880-pinmux pinctrl: request pin 14 (io14) for pinctrl
[ 0.090000] rt2880-pinmux pinctrl: uartf(1),gpio(0) = 5a311d
[ 0.100000] rt2880-pinmux pinctrl: failed to lookup the sleep state
[ 0.100000] rt2880_gpio 10000600.gpio: registering 24 gpios
[ 0.110000] rt2880_gpio 10000600.gpio: registering 24 irq handlers
[ 0.110000] rt2880_gpio 10000660.gpio: registering 32 gpios
[ 0.120000] rt2880_gpio 10000660.gpio: registering 32 irq handlers
[ 0.120000] rt2880_gpio 10000688.gpio: registering 1 gpios
[ 0.130000] rt2880_gpio 10000688.gpio: registering 1 irq handlers
[ 0.130000] Switched to clocksource systick
[ 0.140000] NET: Registered protocol family 2
[ 0.140000] TCP established hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.160000] TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.160000] TCP: Hash tables configured (established 2048 bind 2048)
[ 0.180000] TCP: reno registered
[ 0.190000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.200000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.210000] NET: Registered protocol family 1
[ 0.220000] PCI: CLS 0 bytes, default 32
[ 0.220000] rt-timer 10000100.timer: maximum frequency is 2441Hz
[ 0.240000] alarmtimer alarmtimer: no of_node; not parsing pinctrl DT
[ 0.240000] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.260000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.260000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.290000] msgmni has been set to 500
[ 0.290000] io scheduler noop registered
[ 0.300000] io scheduler deadline registered (default)
[ 0.310000] drivers/phy/phy-ralink-usb.c:ralink_usb_phy_probe[147]
[ 0.330000] drivers/phy/phy-ralink-usb.c:ralink_usb_phy_probe[161]
[ 0.330000] Serial: 8250/16550