grabserial抓串口时间

退出串口，然后执行：

./grabserial -d /dev/ttyUSB0 -t

结果：

leon@leon-laptop:~$ ./grabserial -d /dev/ttyUSB0 -t
0.00   0 BBooting PMON...
2.14 214 LED32S30   PMON_VER== 83   PMU_VER== 13 
2.21   6
2.21   0 Loading file: /dev/mtd0 (elf)
2.24   3 0x80200000/2628072 + 0x804819e8/229736(z) + 
2.76  51 Entry address is 802043f0
2.78   2 g
2.78   0 Linux version 2.6.27.47-0990e1 (helen@helen) (gcc version 4.3.0 (GCC) ) #333 Wed Nov 27 11:09:35 CST 2013
2.81   3 boot info :ubi.mtd=1 root=ubi0:rootfs r rootfstype=ubifs mem=48M@0M mem=126M@128M console=ttyS0,115200 lpj=1060864 quiet
2.84   2 Booting Linux kernel...
2.85   0 busclock=756000000, cpuclock=94500000,memsize=256,highmemsize=0
2.87   1 console [early0] enabled
2.87   0 CPU revision is: 00004220 (Loongson 232)
2.89   2 FPU revision is: 00330501
2.90   0 LS232 CPU board
2.90   0 memsize=256,highmemsize=0
3.58  67
3.58   0 Please press Enter to activate this console. 
3.63   5 init started: BusyBox v1.11.1 (2013-10-17 09:58:19 CST)
3.65   2 starting pid 220, tty '': '/etc/init.d/rcS'
3.99  34 UBI device number 1, total 320 LEBs (40632320 bytes, 38.8 MiB), available 0 LEBs (0 bytes), LEB size 126976 bytes (124.0 KiB)
4.05   5 create volume user...
5.71 166 starting pid 327, tty '': '-/bin/sh'
5.74   2 starting ipanel.elf ...