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开发板上系统的内核linux 2.6.18。在使用USB 3G上网卡时，使用 wvdial 进行拨号的过程中，串口会打印如下信息： *****************分割线************************* ttyUSB0<*1>: Max speed is 460800; that should be safe. ttyUSB0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK WvModem<*1>: Cannot get information for serial port. ttyUSB1<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud ttyUSB1<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next try: 115200 baud ttyUSB1<*1>: ATQ0 V1 E1 -- and failed too at 115200, giving up. musb_h_tx_flush_fifo 124: Could not flush host TX fifo: csr: 000a musb_h_tx_flush_fifo 124: Could not flush host TX fifo: csr: 000a musb_h_tx_flush_fifo 124: Could not flush host TX fifo: csr: 000a musb_h_tx_flush_fifo 124: Could not flush host TX fifo: csr: 000a WvModem<*1>: Cannot get information for serial port.musb_h_tx_flush_fifo 124: Could not flush host TX fifo: csr: 2003 musb_h_tx_flush_fifo 124: Could not flush host TX fifo: csr: 2003 ttyUSB2<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud ************************分割线************************ 出现上面这样的信息，wvdial拨号连接不上。这样操作过之后，如果拔掉 USB 3G网卡时，串口会打印出很多信息，然后系统重启了。大家知道为什么会出现这样系统重启的问题吗？信息如下： *****************分割线************************* root@192.168.1.3:~# usb 1-1.2: USB disconnect, address 4 printk: 1 messages suppressed. oom-killer: gfp_mask=0x201d2, order=0 Mem-info: DMA per-cpu: cpu 0 hot: high 18, batch 3 used:2 cpu 0 cold: high 6, batch 1 used:0 DMA32 per-cpu: empty Normal per-cpu: empty HighMem per-cpu: empty Free pages: 1296kB (0kB HighMem) Active:2465 inactive:116 dirty:0 writeback:0 unstable:0 free:296 slab:841 mapped:117 pagetables:281 DMA free:1184kB min:1068kB low:1332kB high:1600kB active:9888kB inactive:548kB present:71680kB pages_scanned:1219 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 DMA32 free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 HighMem free:0kB min:128kB low:128kB high:128kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 DMA: 47*4kB 32*8kB 0*16kB 1*32kB 0*64kB 1*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB 0*16384kB = 1116kB DMA32: empty Normal: empty HighMem: empty Swap cache: add 0, delete 0, find 0/0, race 0+0 Free swap = 0kB Total swap = 0kB Free swap: 0kB 17920 pages of RAM 699 free pages 13144 reserved pages 846 slab pages 3525 pages shared 0 pages swap cached Out of Memory: Kill process 1239 (login) score 61 and children. Out of memory: Killed process 1251 (bash). oom-killer: gfp_mask=0x201d2, order=0 …附件中有详细信息… 谢谢你的关注！--

DM365 + 3G网卡调试问题---musb_h_tx_flush_fifo 124: Could no