Jetson Nano UART debug console not working properly

Hello
I am using J44 header for debug console and PL2303HX for USB-TTL. 115200 8N1 with hardware-software flow control off. The terminal is filled with random characters, I am not able to type or see what’s happening. I have used two serial tools minicom and screen… In both cases I didn’t get any result.
Output of console I am dumping as follows:

a) With screen - sudo screen /dev/ttyUSB0 115200

nvidi�@nvidia-desktop:~$�
nvidma@nvidia-desktop:~$ 
nvidia@nvidZXKV֭ѽ��~$ 
+}�e�L˥����~�roundOn~�d�uտW��e-e�-�
                                   �~���vy�ik]�-��.;0nvi�iq;jgo��a���found
nvidk��˥��lesktop:~$�O
                      nv[{��R˥����de{k|op;~&�Mnw��Zxpvy����V֭��;~l�nv��is-�w���~�kYZ؝��+��V��ɳ���5-�nwm���ݥ�ii=d{����~<�nvidma�
                                                                                                                              mnas�:}������4cooma�y�����o��5
                         nviemaJovm�{e-d[�/�
                                            �~&(-��~�׭XP���ma�l��-�
                                                                   �~�)
��ig��˥����g�ͭѽ��~���n�ڷZ�٧��a-�]�}�����M
                                        n~�dim@�����k[y�-�
                                                          �~|`��o�mV+��������wk�ӽ�>~g(

b) With minicom

Welcome to minicom 2.7

OPTIONS: I18n 
Compiled on Nov 15 2018, 20:18:47.
Port /dev/ttyUSB0, 14:38:28

Press CTRL-A Z for help on special keys


-bash: q: command not found
nvidia@nvidia-desktop:~$  ~�^wͫ���ˋ�k׉�k�׋�/��� =�i}mn�ݯ�����u=���宫��ý��]̭����V�[�����������-��z~d*M�nvzVݝA�ۥ�ZykYݯ|ov:~�������g�o/ׅ͎;��r���u��e��vyi�w#NvU���ת[�ձ�]W����‹�0i�)Od���ݯ��]��*���e��+&f�7ْ����e.������Noi]�Z�����.'6�/N��Ϙ�;5:+Ll۳����;VVn�0sb�ё�      �
�ujn��������_��L�ߧgMWH�.�.W�gSl��}�z���ߺz��'���z�����Uw�o*gSV���ima~y)uo5�]���ȺX/�/_��k5z��2�8�o7w{]��+����V����WmwW�����5S��u�� f
M0007�l&�W����ʫ��ݓB����Ɂ2�չ��noa�el0���0xnf72p020C�۲>07.3��E��%e�5%                                                             �
 [p�07.�13} Bpmp F� ���V������偻���ד}
                                       +���v����]I��J��сwucco�oV�k��ٱ��f�枂�j��{0007>37�] Set�N��Y�Wkk+#bZ]���[0007.s3?] W[C  0
*_1007.��OWHS+�������]�����ѥ���of Secure OS$Successfu�r info:`pleinte�t
��0007.570]�����Z���W-����������>KN�W-WҮ-�YI�Z Tmw5)��p00w��89_ Next stage �knary rmad$took�N���6&��׮I��980?��y�] Cas�eout,t�
���r���}��ѽ�دTbootQspiFl�UVU��R�Œ�ϱ�����M�闁��Ճ-b-ϫNLM����M���           ��ݑ�٥�e0Wsite!Tmmu = 0(msl Wzite [i�YHOHLH)�C�[00 -
[0�07.567] Sec$F�otYyWk�                                                                                                          M

[�61��˲ꐮw�~�-���p&d*�ѥ���co-proV���KRH�H�o�I�Ez!$�ms5:�vy.3(releqs�U��ossful�Nowڨ�rc���������ǢӒ�Ғ�f�j���������j��      k
[0007.754] 408000 not fou�t in D�ԕW���H�[0527/w](�x[�˫����-��20�7.7�?W$qץ�W=���>��������ɂ�����Ս������}9�[p407.779] DT Writ    d
�+L�&N17S�꩕{�˫��U]S%����(�wewe�t��ial velue s�t..My"=�s�����]��v�oov���c|;=)��۸68x���s���U�7AS�hso�t�ՙ����ɕ���j����ƍ�bBJEj_C���  s
I+�����ɥ���boot device              [0088.096W�*T+V��k[���V�.]Y�˅[01:8�4Onא޷�]ʬ닁*�ݭ��5R���8.10:] }llocating emo��(�[6���      �
*[04p9.q3�ؾlocct�~wh�Y[[W�����conve���a�L�̜.1t6](e�abling"l�k�[�����/172_�.�ɑ�K���5h���r�����ۑcard gpioX�ڷ�0����h�089�12x}        z
                      R���[0008.164] Send command 3                                    [0008.144] íY�-Ȭln]иresent and st�bme
��сRCA fo/H��Y��l.Yc�+L�̜)��ꁊՕ���铁�������data by command 9
[0008.178] Parse C*Vх5
                         [0008.180] Send command 7
[0008.191] Calling sd device register
[0008.194] Init sdcard
[0008.196] Allocating memory for boot devmce
[0008.201] Registering user device
[0008.214] Enable APE clock
[0008.216] Un-powergate APE partition
[0008.220] of_register: registering tegra_udc to of_hal
[0008.225] of_register: registering tegra_udc to of_hal
[0008.230W��}ɕ���ѕ�� registering invr08-driver to of_hal
[0008.236] of_register: registering ads1015-driver to of_hal
[0008.241] of_register: registering lp8557-bl-driver to of_hal
[0008.247] of_register: registering bq2419x_charger to of_hal
[0008.253] of_register: registering cpc to of_hal
[0008.257] of_register: registering bq27441_fuel_gauge to of_hal
[0008.269] gpio framework initialized
[0008.272] of_register: registering tca9539_gpio to of_hal
[0008.277] of_register: registering tca9539_gpio to of_hal
[0008.283] of_register: registering i2c_bus_driver to of_hal
[0008.288] of_register: registering i2c_bus_driver to of_hal
[0008.294] of_registerz registering i2c_bus_driver to of_hal
[0008.299] of_register: registering i2c_bus_driver to �}���5
                                                            [0008.305] pmic framework initialized
[0008.309] of_register: registering max77620_pmic to of_hal
[0008.314] regulator framework initialized
[0008.318] of_register: registering tps65132_bl_driver to of_hal
[0008.324] initializing target
[0008.330] gpio_driver_register: register 'tegra_gpio_driver' driver
[0008.338] fixed regulator driver initialized
[0008.356] initializing OF layer
[0008.359] NCK carveout not present
[0008.362] Skipping dts_overrides
[0008.366] of_children_init: Ops found for compatible string nvidia,tegra210-i2c
[0008.382] I2C��ׁInit done
[0008.385] of_children_init: Ops�found for �o}patkble`string nvi��X˺ٖ��ŃjJ�5r�[000�.395] I2� ��.HR�Z��done
[0008.39<] of_c�m��ron_ini�: �ps fou�d�for c_���Z��e$s��i~g nvy�iY��ugra:10-i2c
[�. �<.r987w� |�g�X=�х��ѕ�ͅ�otXK��wnl$u�{,'�V���C�{��0)6.0�<����eg�X��х��ٕ�ɗ���tag� P�o�� do�e ������ꪽ�jR�+Z:i���o��� �          1
[�! ��oq0?20:auugre�oc�le�m���:uw7&.{�k���ɿ����ѹ�vm~��W����[\YW,�re*?6\]������ɏ�d1v�0������k���Jxؐ��L��&�sɕ���}t��ot�[�         n
[   !4.504�;���9;wpio��u}u[�Ս��ss�                             mW��V�,��.�&LLMLL�[�H�_�H����0=75t2WL�Y�W�u��ѡ�ɵ������Ò�s�k��  �
   $6oLL��\׊wo_wy��ɥ����pwm-fan: car�.W,W��b����ݵ:2�5-J�x�Ȑ�.5pt�>�]�pw}_n,��ɥwer�pw}�fq~: go�����2�Ɂ�����ά�ɽ�健��v��[X[         [
K[�z����1�506>]0r߻ط��ivmr pw�-�an:�mnd�y MgM�W����r�õ�400�,�vr����ɱ=1,c�t��[��J�+$HHΓ)���?0} pwm���k������w[K���B����� 5:�7���� �
J_  (�M��>�N�SJ�����z<810: bard�{etup f�Z���l�+HH���.1M���0]��ox�5^�L��KV��}{nHR+��ْ�j:ѥ���*ɥٝ�Z�[000x.462� of�clm��v�})_�rmad$pr�
�[#0 $v黫���u��c˕��ɿ�isteree oe_�ˋ�ə�����ɥٕɑ����5�K׫�OW��.$7^LLS�+l����겢�J������j�L�ݐZ[/������ɑ�{et}r:,vr�r e]W-��ӳ���Iэ��      e
[?����4������u�ѕgrg_r|s �000e0�0.rtc�)�����ݱYY�$��w�.W�W�&���r�ѭ�����Ս�jS�+$hlJ��0�4���]���%�,��:�04.rts:0Tew�q&i�ter�aer 6
[ ���4.8�N��S���W��Z~�,HM������rJ~c: ���y��L�08.507](get emprom"at07-e0, si�e 25ߖ t��e�2                                         �
[000<.524] J�(䗮^��R�&o7ɧ��J���kal�zedM�[� 2 4.?[׿���7�}�C�[#� 03.��ʢ�ꁪ͉�k���ٕ��.]]�ɫ݃��ѝɝ�����ɧٕɁՅ�5)~?HXHJ����\��3.ov�qg��  �
??;/7~�����ѕ�Ʌ�xws��70290p10.zusb:`�X[�Z�OIV��}4]�����Y����˕��m��?+�����m�,H]y�����˂=NW�kV�ɫו��W76�͹}�ő�ѱ���nafned o\w �n-
�  1 &鲲���ꁢ�ora-^�.,�3f�'lLNؗ|�g;(տ�&���с�"F�́=Q}�E5R~�H�&H6��������tegra�xuw�K�X��ٷ�YY��Ճ��ͽ���r���HCM�%��=W�W�o� �T�����r
[ 1L�\����ٺ�酽���Ձ100;��L�\��^i��i֋���d���_Y$���V� device 80x;0M+�jH��.733����j�Y�a-qcku�1��s��0.qciu-conuzoll�r:0PGIG: Enq�    �
*_�ȖJ&��������A�$z[D�sompressyon modu�e��eg�sture���_ �! 6������ꑂUE�De���W��Ss�09�mL��K�Xk���Q!�LHX]۪*�tform tegre-sa�mreK\[     2
K��X��%�Ց�����J́+ٕ�����staztedlias(i2c;-+[0228.743]�gut eeprom�X�Ȧ)    �� W�6,�U�������٥�����ɕ����r���r&� at03-ae, sizu 257.(u  �
[��0 0.70925����070�UԔ��U�Ju�V�{�a� 3�1��ʺ��͟ɥ����921�8-�"�N��n��[ N��&����ꥒ�5���G��X�Z_�Q�ZY��]���ziwo/� t��Sµ9A=뫝��C�[ ` ( �
[2  �������������C�⊢҂�Ң�z�҂��cjlm���֞W{�81�HRٽ���Ԯ-W�Rە������H&��݊����[i�ؼ+�H�������ꁽ����.��3ER��ڶ�%t�Wn�|+$l�              M
����ͅuio�>5p63] Z�֟K2J�ѕ��I��Gioabiv�Wir|���׽���n Netw�rk drZW����������Mr�r�z[�)�+$�$�&��ݢ���EZ�ޗ�'����ɥ��сB�����k����        �
{e ��3n���������%�*�kR֕��$֫���ͅ�}b�}w�MZ{($b�z���jRޅ���*���?���}�e{o]�V֗'n_S�oR�/�27?1:]0+��uz5*R�U�ucvev 5�/��&�h��풺�V��      �
*�'$$M��.���%~�W����ep|er: uevmnt>2ve�����Z��͏��͹vzjR�r���ⳣ끑evisg-m{x�er: ik�K����v��J��ѱ�’������I��j��ѥ���͕��"��du�Y��|�:�Tlem
���ɽ���Ɂ%���ٙ��������e�����mq ,���WV遂ɽ����rzv�����ѕ�}-�+����ъ����͑���遚���ɕ�"��iuX�B��с�닉m}sh �,,��+��ɵ����327681(ordYi�^ZX�   �
�G��z����Ҳ�_����K���ɥ��ѡ���CZY���j�man�-k�嵊�RB��sٺv�M�g�5������ѕ�ed nZ[YYH.�i���ut�������с���ݱ��RnY������������IAM>"R�g�      �
��0 h$�ɺ������?����eg{suew�d!trotos�W�k^ז_� � 4.u14128] sdlci-�ltvm:�+QS���dd-eez��w��ʊ���kY�r�C�[  ��0~49�56?] Z����r������U)
�[ 0�x�)�<264]!io[]gHP��[�V��k�6���ﮏ����_5]+:ɿ���&�N|+HH��6��M^n/�z}������͵�pvobu�[$   4.15���z���qna��rm$pvobm sukcesw�H�gz  ?
��h�Z���LM�S�S������������ѥ�|i��Ү�֮֬/W�+}k�J��٥��izqtڹ��#�����9?OWY].��K���r]V{W�W�V$��(i~tuvf\�,��-W�.���W����)��V��x�kY/  �R�
K�(�!�Mי85��[E[�wetoѥ��BI��(s�9):$ru=ooun�Y���/K��5R�+$$������� �/��ʺ�{���t���U����������&t��gv {wap.�4�I���] rg��.ז�7���׭lv�mMy
�cC�U�unvu"LN�4.���U?��W�+��ѽ���o��t����W�n�-V+V��k׋��5z��!2,LM������ꁹٝ������������v:�]�%$�j��!���gm���_�-׏���͗�wp_������[V��Ձ�wh�
�Hkh繣î�ߪ���ͭ����qn�om�ho{�`e�keznY��\�Y��K�[)$�15�59�Ҳ�E�������X˽��sY[��Y��Y.���������͵�{ )$1u/5?8�M�W�}�����ˋ��R]PUSG�UT���&����
���o0Plu�=-�{202'4.�8LNMW��p�>!{�yt l�[!0 h5.�&Ӧ�����8� new�][��\$���.�]A�-c��:"�]V�ѕɗ��R�+��ZH͸562X]Y�������gJ�iK�����b�Wo� �
�ߐ�  p��ؚ�y3WH�떅}͵�� 70�Ln�ؙ.iom[]���oi�yW֖�,HR���=[��mW��j��H�.�L����ʪꁾ�ͽ��R�qgunHJL�֋����֝ݙ�ႂ�2�݃��s����ŤՍ�����g�lY���Y��_[���
�[!4 $4.��7217]4myt�˵g��ѵ�م�����э���"��p}s��|e:$�ab�Y�a�WW4��Z[�Y|Y^��Y��j�7*��v綢�����������T���E%"�ͅɳՑ}*{!�`�4��޾740[205q.739n
J_�"�!0.4��S7Si����K����‚����r��ɥ��� d녥��:�fv��g�vR�N�L��,{[�ytew"��2�?fnf�vn�V���O��J�%i���r��;934_�m�mmu�`���in��dovose��    \
%��LLLY��顥�U���o_upd�t��k�6w6�ۧh�^-�/x���u�gu�6�?nT�lYY���.d��T�5R�[0��L�ΧM_�YY�rom_�e�Տ��*U        ����jRo �5Rڂ��.77?]�ە#   '
e��͹�bg��ѥ���J���ե���1��ux`on0physycal)CP�(ܼ1bugger>�el z�Y��info�vo DVKs�‚Ƃ����{cm~��5�U~[Z�+���˕��i���ے��r�M���{���?�?] percq]��
[`�JМ.1000��]�xsci���IG��UQ��e��E�

I don’t understand why this is happening

When I use other jetson nano, with same settings. That nano is working fine. Is it a board issue?

Hi, the issue kit is same to other ones on hw and sw, right? Did you do check with issue module + good carrier board to check it is a module issue or carrier board issue?

Hi garimakaushik134,

Have you confirmed that’s module issue or carrier board issue?
Any result can be shared?