I install OpenWRT on raspberry pi 3 model B, entered the dmesg command after configuring the Internet.
And it gave me this report:
[ 390.694894] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 390.708768] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 390.725233] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 627.675276] bcm2708_fb soc:fb: bcm2708_fb_blank(1) failed: -12
[ 632.520994] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 632.536110] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 632.554119] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 632.879784] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 632.896046] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 632.914754] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 633.235255] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 633.252027] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 633.271044] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 633.592235] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 633.609198] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 633.628517] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 652.240492] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 652.257632] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 652.276966] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 652.595823] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 652.612987] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 652.632398] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 652.953142] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 652.970337] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 652.989737] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 653.310367] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 653.327552] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 653.346961] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 654.663241] kmodloader: loading kernel modules from /etc/modules.d/*
[ 654.675688] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 654.723231] kmodloader: loading kernel modules from /etc/modules.d/*
[ 654.735649] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 677.120888] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 677.137794] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 677.156864] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 677.478565] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 677.495453] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 677.514572] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 677.835117] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 677.851966] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 677.871076] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 678.190138] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 678.206984] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 678.226070] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 678.925094] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 678.941924] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 678.961158] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 692.101649] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 692.118789] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 692.138213] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 692.457757] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 692.474896] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 692.494262] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 692.813948] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 692.831123] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 692.850489] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 693.171363] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 693.188499] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 693.207844] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 694.019041] kmodloader: loading kernel modules from /etc/modules.d/*
[ 694.032113] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 694.043675] ohci-platform: OHCI generic platform driver
[ 694.054347] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 704.631676] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 704.648613] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 704.667757] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 704.986693] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 705.003613] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 705.022737] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 705.342045] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 705.358946] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 705.378077] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 705.698291] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 705.715174] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 705.734281] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 706.085163] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 706.102056] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 706.121338] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 717.383274] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 717.400430] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 717.419767] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 717.740136] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 717.757281] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 717.776616] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 718.095169] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 718.112314] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 718.131732] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 718.455217] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 718.472373] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 718.491767] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 719.362411] kmodloader: loading kernel modules from /etc/modules.d/*
[ 719.378447] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 743.075159] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 743.092178] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 743.111491] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 743.432189] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 743.449205] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 743.468494] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 743.787701] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 743.804704] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 743.824043] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 744.145146] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 744.162193] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 744.181463] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 744.706517] kmodloader: loading kernel modules from /etc/modules.d/*
[ 744.718942] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 772.217158] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 772.234076] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 772.253328] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 772.573795] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 772.590796] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 772.610112] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 772.934694] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 772.951734] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 772.971007] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 773.295148] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 773.312140] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 773.331408] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 795.295139] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 795.312169] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 795.331457] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 798.750685] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 798.767905] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 798.787389] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 799.106891] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 799.124171] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 799.143711] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 799.462877] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 799.480059] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 799.499453] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 799.818384] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 799.835567] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 799.854994] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 800.215152] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 800.232317] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 800.251695] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1026.771318] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1026.788478] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1026.807871] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1027.126490] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1027.143668] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1027.163083] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1027.481988] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1027.499175] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1027.518543] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1027.843980] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1027.861176] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1027.880570] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1028.205301] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1028.222461] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1028.241828] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1112.498820] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1112.515978] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1112.535342] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1112.854037] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1112.871199] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1112.890586] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1113.211379] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1113.228568] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1113.247935] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1114.691740] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1114.708924] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1114.728370] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1130.636841] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1130.654030] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1130.673526] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1130.996829] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1131.013967] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1131.033421] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1131.356778] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1131.373943] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1131.393326] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1188.436846] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1188.454009] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1188.473442] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1188.796844] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1188.813991] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1188.833460] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1205.908367] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1205.925687] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1205.945239] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1206.263549] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1206.280732] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1206.300114] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1206.619259] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1206.636442] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1206.655822] cpufreq: __target_index: Failed to change cpu frequency: -22
[ 1207.026816] bcm2835-cpufreq:bcm2835_cpufreq_set_clock:84: Failed to set clock : 1200000 (-12)
[ 1207.043990] bcm2835-cpufreq:bcm2835_cpufreq_driver_target_index:183: Error oc curred setting a new frequency (1200000)
[ 1207.063358] cpufreq: __target_index: Failed to change cpu frequency: -22
How can I fix the error?