Tool/software: Linux
I use ti-processor-sdk-linux-am335x-evm-05.03.00.07-Linux-x86-Install.bin to install kernel , and add 4g modules (Quectel EC20) on board . According to Quectel 's USB_Driver_User_Guide , I success install driver and I can find ttyUSB0~ttyUSB3 in /dev . I also success use PPP to install ppp0(as follow) . while after about 1 minute the system can't work as follow, I want to know where I went wrong. thankyou!
root@am335x-evm:~# ifconfig
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.21.56.202 P-t-P:10.64.64.64 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:5 errors:0 dropped:0 overruns:0 frame:0
TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:62 (62.0 B) TX bytes:349 (349.0 B)
[ 103.097341] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 103.105936] pgd = db0f0000
[ 103.108819] [00000000] *pgd=00000000
[ 103.112639] Internal error: Oops: 805 [#1] PREEMPT ARM
[ 103.118105] Modules linked in:
[ 103.121383] CPU: 0 PID: 95 Comm: sd-resolve Tainted: G W 4.14.79-ge669d52447 #91
[ 103.130445] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 103.136917] task: dc630000 task.stack: db0ce000
[ 103.141775] PC is at usb_anchor_urb+0x7c/0x104
[ 103.146508] LR is at irq_work_queue+0xe8/0xfc
[ 103.151139] pc : [<c0718074>] lr : [<c01aafb4>] psr: 600e0093
[ 103.157796] sp : db0cf860 ip : db0cf730 fp : db0cf87c
[ 103.163345] r10: 00000044 r9 : c0e16700 r8 : db0ce000
[ 103.168892] r7 : 00000044 r6 : 200e0093 r5 : dc57b044 r4 : dc5de380
[ 103.175824] r3 : dc5de39c r2 : 00000000 r1 : c0e10aa0 r0 : c0c5cef4
[ 103.182760] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none
[ 103.190432] Control: 10c5387d Table: 9b0f0019 DAC: 00000051
[ 103.196537] Process sd-resolve (pid: 95, stack limit = 0xdb0ce210)
[ 103.203097] Stack: (0xdb0cf860 to 0xdb0d0000)
[ 103.207747] f860: 00000000 dc57b020 dc5de380 00000044 db0cf8d4 db0cf880 c0744ec8 c0718004
[ 103.216451] f880: db0cf89c db0cf890 00000044 dc57b000 400e0013 01080020 dc5d1000 dc5da340
[ 103.225147] f8a0: db3900b0 dc57b040 00000040 c0744d2c db36280e 00000040 00000001 c0a24f78
[ 103.233846] f8c0: db390000 00000001 db0cf8ec db0cf8d8 c073ed08 c0744d38 00000044 db36280e
[ 103.242542] f8e0: db0cf93c db0cf8f0 c06f7c70 c073ecd8 db0ce000 c0e3de90 db7ad400 c0e16700
[ 103.251243] f900: 00000001 ffffc021 00000000 00000000 00000000 db390000 db1396c0 db6a0518
[ 103.259935] f920: 00000000 01080020 00400080 c0e03f14 db0cf954 db0cf940 c06f7ea8 c06f78e0
[ 103.268637] f940: db390094 db6a04e0 db0cf9c4 db0cf958 c06f24a0 c06f7e60 c08b112c c08b07e8
[ 103.277335] f960: c016b1a8 c012dff8 dc64f600 c0e0fbd0 0002eabf 00000000 0002eabf dc052438
[ 103.286034] f980: dc052430 db0fee40 c0e0501c c08b0e1c db1396c0 dc00e800 db0cfa0c db6a04e0
[ 103.294736] f9a0: 00000021 00000021 db1396c0 01080020 00400080 c0e03f14 db0cfa14 db0cf9c8
[ 103.303433] f9c0: c06f4370 c06f2430 db1396c0 00000000 c0c5a3b0 c0c5a3cc 00000000 c0c5a37c
[ 103.312131] f9e0: db0cfa2c db0cf9f0 c0870de8 db6a04e0 db1396c0 c0a92330 d71cd600 c0e03b0c
[ 103.320830] fa00: 00000000 c0e03f14 db0cfa2c db0cfa18 c06f65f0 c06f3f8c db1396c0 db6a0000
[ 103.329529] fa20: db0cfa4c db0cfa30 c06f6790 c06f65b4 db1396c0 00000000 db6a0000 d71cd600
[ 103.338230] fa40: db0cfa84 db0cfa50 c08714d8 c06f6658 db0cfa8c c0e16700 c0871420 db2e4f00
[ 103.346928] fa60: db1396c0 d71cd600 db6a0000 00000001 00000000 00000000 db0cfab4 db0cfa88
[ 103.355621] fa80: c0899850 c087145c 00000000 00000010 db1396c0 00000136 00000000 db2e4f00
[ 103.364324] faa0: 00000000 0000003e db0cfb14 db0cfab8 c0871a44 c0899664 db2e4f48 00000001
[ 103.373022] fac0: 0000003e 00000000 000000f8 00000000 fffffff4 00000000 db0cfafc db0cfae8
[ 103.381723] fae0: c08556e4 c0854924 014000c0 db6a0000 db1396c0 db2e4400 00000010 000005dc
[ 103.390424] fb00: 00000011 0000002a db0cfb24 db0cfb18 c0871e40 c0871634 db0cfb34 db0cfb28
[ 103.399124] fb20: c087e2b4 c0871e38 db0cfb64 db0cfb38 c08b4188 c087e2ac dc630504 e17ee6b7
[ 103.407822] fb40: db0cfb6c db1396c0 db1396c0 dc1cd600 c0e55410 000005dc db0cfb9c db0cfb68
[ 103.416522] fb60: c08b5a50 c08b3fb8 c08abcb8 c08abb64 db1396c0 db1396c0 c0e55410 db6a0000
[ 103.425216] fb80: dc1cd600 dc1cd830 00000011 0000002a db0cfbe4 db0cfba0 c08b6578 c08b5914
[ 103.433911] fba0: c08b5bd0 c08b3f38 c08b4dd4 00000000 db0cfbf4 dc1cd600 dc1cd830 c08b56dc
[ 103.442610] fbc0: db0cfeb4 0000002a db1396c0 c0e55410 dc1cd600 0000003b db0cfc04 db0cfbe8
[ 103.451311] fbe0: c08b5cb0 c08b64e4 db1396c0 c0e55410 dc1cd600 0000003b db0cfc1c db0cfc08
[ 103.460005] fc00: c08b6e60 c08b5c7c db1396c0 db362824 db0cfc44 db0cfc20 c08e1504 c08b6e50
[ 103.468704] fc20: dc1cd600 db1396c0 00000022 e17ee6b7 00000002 dc1cd830 db0cfd4c db0cfc48
[ 103.477403] fc40: c08e3c70 c08e1400 0000002a 00000008 db0cfc84 db0cfc80 00044040 c085cbc0
[ 103.486099] fc60: 4a68400a 00000000 00003500 c08b56dc 00000000 00000000 00000001 00000011
[ 103.494798] fc80: 00000000 db396f48 db0c0000 db0cfc98 c04098ec e17ee6b7 00000000 00000000
[ 103.503496] fca0: ffff0000 c04098c0 ffffffff db0cfd0c db0cfda8 00000008 ffffe000 db0cfda8
[ 103.512197] fcc0: 00000008 00000000 00000001 c0221584 00000008 db0cfebc 00000000 db0cfd84
[ 103.520896] fce0: 00000001 00000001 00004000 db9ec600 db0cfd34 db0cfd00 c03eb45c c0221504
[ 103.529591] fd00: db0cfda8 db0cfd0c 00000000 db0cfda8 db8abf68 db0cfebc 00000000 db0cfd84
[ 103.538292] fd20: 00000051 dc1cd600 00044000 00000000 db9ec600 00000002 db0cfd88 00000000
[ 103.546991] fd40: db0cfd6c db0cfd50 c08edbe0 c08e37d0 00000001 00000000 00000000 db0cfeb4
[ 103.555688] fd60: db0cfd7c db0cfd70 c0852cdc c08edbb0 db0cfe94 db0cfd80 c08530cc c0852ccc
[ 103.564383] fd80: c0e56e70 00000000 00000000 dc1b6a1c 00000000 c0ac2f90 db0cfe20 00000001
[ 103.573079] fda0: ffffffff dc1cd830 b6acc1f0 00000022 dc1cd830 db6a0000 db333000 db0cfe20
[ 103.581774] fdc0: db0cfe1c db0cfdd0 c08aef64 c08ac524 00000000 dc1cd830 db6a0000 dc7c6780
[ 103.590470] fde0: 00000000 00000000 db333000 00000000 c08aee68 dc1cd830 c0e55410 00000000
[ 103.599172] fe00: db0cff08 dc1cd830 dc7c6780 c0e55410 db0cff08 dc1cd830 00000000 dc7c6780
[ 103.607867] fe20: db0cfe54 db0cfe30 db139240 0000000d db0cfe5c db0cfe40 c0240e94 c01734cc
[ 103.616566] fe40: db0cfeb0 db0cfeac 00000002 00000176 db0cfe6c db0cfe60 c0240f08 c0240e04
[ 103.625265] fe60: db0cfe7c db0cfe70 c0240f74 00000000 b6acc168 00044000 db0ce000 00000002
[ 103.633970] fe80: 00004000 db9ec600 db0cff94 db0cfe98 c08540c0 c0853024 db0cfee4 00000080
[ 103.642667] fea0: c0856bd0 00000001 dc1cd600 00000001 00000000 00000000 00000000 00000001
[ 103.651365] fec0: 00000000 00000000 db0cfdb0 00000000 db0cfefc 00000000 00000000 00044040
[ 103.660061] fee0: 00000000 c08edb18 db9ec600 c08edb18 db0cffa4 db0cff00 c0853a64 c0222184
[ 103.668762] ff00: 00000000 00000001 35000002 e17ee6b7 db0cff54 db0cff20 c0180990 c0119804
[ 103.677461] ff20: ffffffff 00000000 2f9a4780 00c5e32e db0cff80 00000000 00000000 0000004e
[ 103.686153] ff40: c0107de4 00000001 b6acc134 00000000 00000000 c0107de4 db0ce000 000000a8
[ 103.694852] ff60: db0cffa4 ffffffff c0236ca4 0000000d 00004000 00000002 00000176 c0107de4
[ 103.703553] ff80: db0ce000 00000176 db0cffa4 db0cff98 c085418c c0854048 00000000 db0cffa8
[ 103.712251] ffa0: c0107be0 c0854188 0000000d 00004000 0000000d b6acc168 00000002 00004000
[ 103.720946] ffc0: 0000000d 00004000 00000002 00000176 00000000 00000000 32243650 5ca804e2
[ 103.729644] ffe0: 00000176 b6acc068 b6cc6319 b6c487e6 800e0030 0000000d 00000000 00000000
[ 103.738321] Backtrace:
[ 103.740974] [<c0717ff8>] (usb_anchor_urb) from [<c0744ec8>] (usb_wwan_write+0x19c/0x2a4)
[ 103.749579] r7:00000044 r6:dc5de380 r5:dc57b020 r4:00000000
[ 103.755603] [<c0744d2c>] (usb_wwan_write) from [<c073ed08>] (serial_write+0x3c/0x68)
[ 103.763839] r10:00000001 r9:db390000 r8:c0a24f78 r7:00000001 r6:00000040 r5:db36280e
[ 103.772146] r4:c0744d2c
[ 103.774873] [<c073eccc>] (serial_write) from [<c06f7c70>] (ppp_async_push+0x39c/0x580)
[ 103.783275] r5:db36280e r4:00000044
[ 103.787091] [<c06f78d4>] (ppp_async_push) from [<c06f7ea8>] (ppp_async_send+0x54/0x5c)
[ 103.795514] r10:c0e03f14 r9:00400080 r8:01080020 r7:00000000 r6:db6a0518 r5:db1396c0
[ 103.803829] r4:db390000
[ 103.806542] [<c06f7e54>] (ppp_async_send) from [<c06f24a0>] (ppp_push+0x7c/0x69c)
[ 103.814493] r5:db6a04e0 r4:db390094
[ 103.818310] [<c06f2424>] (ppp_push) from [<c06f4370>] (__ppp_xmit_process+0x3f0/0x554)
[ 103.826730] r10:c0e03f14 r9:00400080 r8:01080020 r7:db1396c0 r6:00000021 r5:00000021
[ 103.835039] r4:db6a04e0
[ 103.837749] [<c06f3f80>] (__ppp_xmit_process) from [<c06f65f0>] (ppp_xmit_process+0x48/0xa4)
[ 103.846727] r10:c0e03f14 r9:00000000 r8:c0e03b0c r7:d71cd600 r6:c0a92330 r5:db1396c0
[ 103.855037] r4:db6a04e0
[ 103.857751] [<c06f65a8>] (ppp_xmit_process) from [<c06f6790>] (ppp_start_xmit+0x144/0x1ac)
[ 103.866529] r5:db6a0000 r4:db1396c0
[ 103.870365] [<c06f664c>] (ppp_start_xmit) from [<c08714d8>] (dev_hard_start_xmit+0x88/0x114)
[ 103.879330] r7:d71cd600 r6:db6a0000 r5:00000000 r4:db1396c0
[ 103.885375] [<c0871450>] (dev_hard_start_xmit) from [<c0899850>] (sch_direct_xmit+0x1f8/0x228)
[ 103.894533] r10:00000000 r9:00000000 r8:00000001 r7:db6a0000 r6:d71cd600 r5:db1396c0
[ 103.902848] r4:db2e4f00
[ 103.905563] [<c0899658>] (sch_direct_xmit) from [<c0871a44>] (__dev_queue_xmit+0x41c/0x804)
[ 103.914438] r8:0000003e r7:00000000 r6:db2e4f00 r5:00000000 r4:00000136
[ 103.921576] [<c0871628>] (__dev_queue_xmit) from [<c0871e40>] (dev_queue_xmit+0x14/0x18)
[ 103.930180] r10:0000002a r9:00000011 r8:000005dc r7:00000010 r6:db2e4400 r5:db1396c0
[ 103.938490] r4:db6a0000
[ 103.941216] [<c0871e2c>] (dev_queue_xmit) from [<c087e2b4>] (neigh_direct_output+0x14/0x18)
[ 103.950106] [<c087e2a0>] (neigh_direct_output) from [<c08b4188>] (ip_finish_output2+0x1dc/0x378)
[ 103.959450] [<c08b3fac>] (ip_finish_output2) from [<c08b5a50>] (ip_finish_output+0x148/0x200)
[ 103.968507] r8:000005dc r7:c0e55410 r6:dc1cd600 r5:db1396c0 r4:db1396c0
[ 103.975636] [<c08b5908>] (ip_finish_output) from [<c08b6578>] (ip_output+0xa0/0x120)
[ 103.983868] r10:0000002a r9:00000011 r8:dc1cd830 r7:dc1cd600 r6:db6a0000 r5:c0e55410
[ 103.992180] r4:db1396c0
[ 103.994887] [<c08b64d8>] (ip_output) from [<c08b5cb0>] (ip_local_out+0x40/0x44)
[ 104.002659] r7:0000003b r6:dc1cd600 r5:c0e55410 r4:db1396c0
[ 104.008678] [<c08b5c70>] (ip_local_out) from [<c08b6e60>] (ip_send_skb+0x1c/0x7c)
[ 104.016632] r7:0000003b r6:dc1cd600 r5:c0e55410 r4:db1396c0
[ 104.022656] [<c08b6e44>] (ip_send_skb) from [<c08e1504>] (udp_send_skb+0x110/0x24c)
[ 104.030792] r5:db362824 r4:db1396c0
[ 104.034607] [<c08e13f4>] (udp_send_skb) from [<c08e3c70>] (udp_sendmsg+0x4ac/0x844)
[ 104.042750] r9:dc1cd830 r8:00000002 r7:e17ee6b7 r6:00000022 r5:db1396c0 r4:dc1cd600
[ 104.050987] [<c08e37c4>] (udp_sendmsg) from [<c08edbe0>] (inet_sendmsg+0x3c/0x70)
[ 104.058950] r10:00000000 r9:db0cfd88 r8:00000002 r7:db9ec600 r6:00000000 r5:00044000
[ 104.067259] r4:dc1cd600
[ 104.069986] [<c08edba4>] (inet_sendmsg) from [<c0852cdc>] (sock_sendmsg+0x1c/0x2c)
[ 104.078021] r4:db0cfeb4
[ 104.080735] [<c0852cc0>] (sock_sendmsg) from [<c08530cc>] (___sys_sendmsg+0xb4/0x20c)
[ 104.089070] [<c0853018>] (___sys_sendmsg) from [<c08540c0>] (__sys_sendmmsg+0x84/0x140)
[ 104.097583] r10:db9ec600 r9:00004000 r8:00000002 r7:db0ce000 r6:00044000 r5:b6acc168
[ 104.105898] r4:00000000
[ 104.108612] [<c085403c>] (__sys_sendmmsg) from [<c085418c>] (SyS_sendmmsg+0x10/0x14)
[ 104.116847] r10:00000176 r9:db0ce000 r8:c0107de4 r7:00000176 r6:00000002 r5:00004000
[ 104.125157] r4:0000000d
[ 104.127884] [<c085417c>] (SyS_sendmmsg) from [<c0107be0>] (ret_fast_syscall+0x0/0x54)
[ 104.136213] Code: e5853004 e34c00c5 e584501c e5842020 (e5823000)
[ 104.142706] ---[ end trace 60393f08805d93d6 ]---
[ 104.147616] Kernel panic - not syncing: Fatal exception in interrupt
[ 104.154379] ---[ end Kernel panic - not syncing: Fatal exception in interrupt
[ 108.110491] musb-hdrc musb-hdrc.1: VBUS_ERROR in a_suspend (88, <AValid), retry #0, port1 00000507
[ 108.120069] musb-hdrc musb-hdrc.0: VBUS_ERROR in a_suspend (80, <SessEnd), retry #0, port1 00000507
