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AM437x UART does not work

Hi  

Can  anybody  help me ?  AM437x   ttyS0   debug console  is ok.But   there is not ttyS1 ttyS2  under the /dev , boot up log  ,log show 

dmesg | grep 8250


[ 0.296179] Serial: 8250/16550 driver, 10 ports, IRQ sharing enabled
[ 0.298539] omap8250_probe
[ 0.298618] omap8250_probe
[ 0.298680] omap8250 44e09000.serial: No clock speed specified: using default: 48000000
[ 0.298714] omap8250 44e09000.serial: GPIO lookup for consumer enable
[ 0.298722] omap8250 44e09000.serial: using device tree for GPIO lookup
[ 0.298746] omap8250 44e09000.serial: using lookup tables for GPIO lookup
[ 0.298754] omap8250 44e09000.serial: lookup for GPIO enable failed
[ 0.299173] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 28, base_baud = 3000000) is a 8250

[    1.168004] omap8250 481a6000.serial: failed to get alias/pdev id

[    1.168004] omap8250 481a6000.serial: failed to get alias/pdev id