Experiencing strange behavior on MIPI CSI2 stream without i2c

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
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On a Xavier NX, I am trying to receive 2 MIPI CSI2 streams (without i2c) from a Xilinx UltraScale+ and experience a strange behavior and I am running out of ideas.

I have the following configuration:

  • Stream 1 is a 4x MIPI (ignored for now)
    - FPGA is currently not streaming yet.
    - mapped to /dev/video0

  • Stream 2 is a 2x MIPI CSI
    - 640x480@50fps
    - YUV422
    - mapped to /dev/video1

I have created a custom driver (stubbing all I2C communication) and modified the dtsi file(s) for both streams get the driver and tegra camera platform loaded. So far so good, I am getting the /dev/video0 and /dev/video1. Since stream1 is not yet available, the testing is done on stream 2 only (/dev/video1). However, I am not able to receive any frames from the FPGA (see the log output below).

When the FPGA is modified to transmit a test pattern, there are some special cases when frames are received:

  1. all horizontal data set to 0’s → OKAY 
    Lane 0: <data id> <wc msb> <0><0><0>...<crc-lsb>
    Lane 1: <wc lsb > < ecc  > <0><0><0>...<crc-msb>
  1. all horizontal data set to 0xff’s → OKAY 
    Lane 0: <data id> <wc msb> <ff><ff><ff>...<crc-lsb>
    Lane 1: <wc lsb > < ecc  > <ff><ff><ff>...<crc-msb>
  1. changing the horizontal data, but keeping them the same in the even and odd lane → OKAY 
    Lane 0: <data id> <wc msb> <1><2><3>...<crc-lsb>
    Lane 1: <wc lsb > < ecc  > <1><2><3>...<crc-msb>

But, having the bytes different on even and odd lane → FAIL
4)

    Lane 0: <data id> <wc msb> <1><3><5>...<crc-lsb>
    Lane 1: <wc lsb > < ecc  > <2><4><6>...<crc-msb>

There is communication, since I can see the frame numbers and, in some special cases, receive valid frames (validated the raw stream data output of v4l2-ctl with respect to the data send by the FPGA).

Question 1. Is there some explanation for this behavior?
Question 2. What is the meaning of the flags and err_data (flags: 96, err_data 4194403)?
Question 3. Is the trace data providing any info on what is going on here?

LOG OUTPUTS:

v4l2-ctl --device /dev/video1 --all

Driver Info (not using libv4l2):
        Driver name   : tegra-video
        Card type     : vi-output, mydriver 10-0020
        Bus info      : platform:15c10000.vi:3
        Driver version: 4.9.201
        Capabilities  : 0x84200001
                Video Capture
                Streaming
                Extended Pix Format
                Device Capabilities
       Device Caps   : 0x04200001
                Video Capture
                Streaming
                Extended Pix Format
Priority: 2
Video input : 0 (Camera 3: ok)
Format Video Capture:
        Width/Height      : 640/480
        Pixel Format      : 'YUYV'
        Field             : None
        Bytes per Line    : 1280
        Size Image        : 614400
        Colorspace        : sRGB
        Transfer Function : Default (maps to sRGB)
        YCbCr/HSV Encoding: Default (maps to ITU-R 601)
        Quantization      : Default (maps to Limited Range)
        Flags             : 

Camera Controls

                     group_hold 0x009a2003 (bool)   : default=0 value=0 flags=execute-on-write
                           gain 0x009a2009 (int64)  : min=0 max=0 step=0 default=0 value=10 flags=slider
                       exposure 0x009a200a (int64)  : min=0 max=0 step=0 default=0 value=13 flags=slider
                     frame_rate 0x009a200b (int64)  : min=0 max=0 step=0 default=0 value=50000000 flags=slider
                 exposure_short 0x009a200c (int64)  : min=0 max=0 step=0 default=0 value=13 flags=slider
           sensor_configuration 0x009a2032 (u32)    : min=0 max=0 step=0 default=0 flags=read-only, volatile, has-payload
         sensor_mode_i2c_packet 0x009a2033 (u32)    : min=0 max=0 step=0 default=0 flags=read-only, volatile, has-payload
      sensor_control_i2c_packet 0x009a2034 (u32)    : min=0 max=0 step=0 default=0 flags=read-only, volatile, has-payload
                    bypass_mode 0x009a2064 (intmenu): min=0 max=1 default=0 value=0
                override_enable 0x009a2065 (intmenu): min=0 max=1 default=0 value=0
                   height_align 0x009a2066 (int)    : min=1 max=16 step=1 default=1 value=1
                     size_align 0x009a2067 (intmenu): min=0 max=2 default=0 value=0
               write_isp_format 0x009a2068 (int)    : min=1 max=1 step=1 default=1 value=1
       sensor_signal_properties 0x009a2069 (u32)    : min=0 max=0 step=0 default=0 flags=read-only, has-payload
        sensor_image_properties 0x009a206a (u32)    : min=0 max=0 step=0 default=0 flags=read-only, has-payload
      sensor_control_properties 0x009a206b (u32)    : min=0 max=0 step=0 default=0 flags=read-only, has-payload
              sensor_dv_timings 0x009a206c (u32)    : min=0 max=0 step=0 default=0 flags=read-only, has-payload
               low_latency_mode 0x009a206d (bool)   : default=0 value=0
               preferred_stride 0x009a206e (int)    : min=0 max=65535 step=1 default=0 value=0
                   sensor_modes 0x009a2082 (int)    : min=0 max=30 step=1 default=30 value=1 flags=read-only

media-ctl -p

Media controller API version 0.1.0

Media device information
------------------------
driver          tegra194-vi5
model           NVIDIA Tegra Video Input Device
serial          
bus info        
hw revision     0x3
driver version  0.0.0

Device topology
- entity 1: mydriver 9-0010 (1 pad, 1 link)
            type V4L2 subdev subtype Sensor flags 0
            device node name /dev/v4l-subdev0
        pad0: Source
                [fmt:SRGGB10_1X10/640x480 field:none colorspace:srgb]
                -> "15a00000.nvcsi--2":0 [ENABLED]

- entity 3: 15a00000.nvcsi--2 (2 pads, 2 links)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev1
        pad0: Sink
                <- "mydriver 9-0010":0 [ENABLED]
        pad1: Source
                -> "vi-output, mydriver 9-0010":0 [ENABLED]

- entity 6: vi-output, mydriver 9-0010 (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video0
        pad0: Sink
                <- "15a00000.nvcsi--2":1 [ENABLED]

- entity 18: mydriver 10-0020 (1 pad, 1 link)
            type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev2
        pad0: Source
                [fmt:YUYV8_1X16/640x480 field:none colorspace:srgb]
                -> "15a00000.nvcsi--1":0 [ENABLED]

- entity 20: 15a00000.nvcsi--1 (2 pads, 2 links)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev3
        pad0: Sink
                <- "mydriver 10-0020":0 [ENABLED]
        pad1: Source
                -> "vi-output, mydriver 10-0020":0 [ENABLED]

- entity 23: vi-output, mydriver 10-0020 (1 pad, 1 link)
             type Node subtype V4L flags 0
             device node name /dev/video1
        pad0: Sink
                <- "15a00000.nvcsi--1":1 [ENABLED]

v4l2-ctl -d /dev/video1 --set-fmt-video=width=640,height=480,pixelformat=YUYV --set-ctrl bypass_mode=0 --stream-mmap --stream-count=30 --stream-to=csi.raw --verbose

VIDIOC_QUERYCAP: ok
VIDIOC_S_EXT_CTRLS: ok
VIDIOC_G_FMT: ok
VIDIOC_S_FMT: ok
Format Video Capture:
        Width/Height      : 640/480
        Pixel Format      : 'YUYV'
        Field             : None
        Bytes per Line    : 1280
        Size Image        : 614400
        Colorspace        : sRGB
        Transfer Function : Default (maps to sRGB)
        YCbCr/HSV Encoding: Default (maps to ITU-R 601)
        Quantization      : Default (maps to Limited Range)
        Flags             : 
VIDIOC_REQBUFS: ok
VIDIOC_QUERYBUF: ok
VIDIOC_QBUF: ok
VIDIOC_QUERYBUF: ok
VIDIOC_QBUF: ok
VIDIOC_QUERYBUF: ok
VIDIOC_QBUF: ok
VIDIOC_QUERYBUF: ok
VIDIOC_QBUF: ok
VIDIOC_STREAMON: ok

<NOTE: MIPI Stream is kept in reset>        

[  871.509216] tegra194-vi5 15c10000.vi: no reply from camera processor
[  871.509616] tegra194-vi5 15c10000.vi: uncorr_err: request timed out after 2500 ms
[  871.510022] tegra194-vi5 15c10000.vi: err_rec: attempting to reset the capture channel
        Index    : 0
        Type     : Video Capture
        Flags    : mapped, error
        Field    : None
        Sequence : 0
        Length   : 614400
        Bytesused: 614400
        Timestamp: 0.000000s (Monotonic, End-of-Frame)

        Index    : 0
        Type     : Video Capture
        Flags    : mapped, error
        Field    : None
        Sequence : 0
        Length   : 614400
        Bytesused: 614400
        Timestamp: 0.000000s (Monotonic, End-of-Frame)

        Index    : 1
        Type     : Video Capture
        Flags    : mapped, error
        Field    : None
        Sequence : 1
        Length   : 614400
        Bytesused: 614400
        Timestamp: 0.000000s (Monotonic, End-of-Frame)

        Index    : 2
        Type     : Video Capture
        Flags    : mapped, error
        Field    : None
        Sequence : 2
        Length   : 614400
        Bytesused: 614400
        Timestamp: 0.000000s (Monotonic, End-of-Frame)

        Index    : 3
        Type     : Video Capture
        Flags    : mapped, error
        Field    : None
        Sequence : 3
        Length   : 614400
        Bytesused: 614400
        Timestamp: 0.000000s (Monotonic, End-of-Frame)[  871.528973] tegra194-vi5 15c10000.vi: err_rec: successfully reset the capture channel


[  874.069777] tegra194-vi5 15c10000.vi: no reply from camera processor
[  874.070141] tegra194-vi5 15c10000.vi: uncorr_err: request timed out after 2500 ms
        Index    : 0
        Type     : Video Capture
        Flags    : mapped, error
        Field    : None
        Sequence : 0
        Length   : 614400
        Bytesused: 614400
        Timestamp: 0.000000s (Monotonic, End-of-Frame)

[  874.078231] tegra194-vi5 15c10000.vi: err_rec: attempting to reset the capture channel
        Index    : 0
        Type     : Video Capture
        Flags    : mapped, error
        Field    : None
        Sequence : 0
        Length   : 614400
        Bytesused: 614400
        Timestamp: 0.000000s (Monotonic, End-of-Frame)

[  874.085152] tegra194-vi5 15c10000.vi: err_rec: successfully reset the capture channel
        Index    : 1
        Type     : Video Capture
        Flags    : mapped, error
        Field    : None
        Sequence : 1
        Length   : 614400
        Bytesused: 614400
        Timestamp: 0.000000s (Monotonic, End-of-Frame)

        Index    : 2
        Type     : Video Capture
        Flags    : mapped, error
        Field    : None
        Sequence : 2
        Length   : 614400
        Bytesused: 614400
        Timestamp: 0.000000s (Monotonic, End-of-Frame)

        Index    : 3
        Type     : Video Capture
        Flags    : mapped, error
        Field    : None
        Sequence : 3
        Length   : 614400
        Bytesused: 614400
        Timestamp: 0.000000s (Monotonic, End-of-Frame)

<NOTE: MIPI Stream is starting>       

[  131.920784] tegra194-vi5 15c10000.vi: corr_err: discarding frame 0, flags: 96, err_data 4194403
[  131.974594] tegra194-vi5 15c10000.vi: corr_err: discarding frame 2, flags: 96, err_data 4194403
[  132.029881] tegra194-vi5 15c10000.vi: corr_err: discarding frame 3, flags: 96, err_data 4194403
[  132.083178] tegra194-vi5 15c10000.vi: corr_err: discarding frame 4, flags: 96, err_data 4194403
[  132.137318] tegra194-vi5 15c10000.vi: corr_err: discarding frame 1, flags: 96, err_data 4194403
[  132.191064] tegra194-vi5 15c10000.vi: corr_err: discarding frame 2, flags: 96, err_data 4194403
[  132.245743] tegra194-vi5 15c10000.vi: corr_err: discarding frame 3, flags: 96, err_data 4194403
[  132.299048] tegra194-vi5 15c10000.vi: corr_err: discarding frame 4, flags: 96, err_data 4194403
[  132.353161] tegra194-vi5 15c10000.vi: corr_err: discarding frame 1, flags: 96, err_data 4194403
[  132.406808] tegra194-vi5 15c10000.vi: corr_err: discarding frame 2, flags: 96, err_data 4194403
[  132.461321] tegra194-vi5 15c10000.vi: corr_err: discarding frame 3, flags: 96, err_data 4194403
[  132.515006] tegra194-vi5 15c10000.vi: corr_err: discarding frame 4, flags: 96, err_data 4194403
[  132.568698] tegra194-vi5 15c10000.vi: corr_err: discarding frame 1, flags: 96, err_data 4194403
[  132.623083] tegra194-vi5 15c10000.vi: corr_err: discarding frame 2, flags: 96, err_data 4194403
[  132.677360] tegra194-vi5 15c10000.vi: corr_err: discarding frame 3, flags: 96, err_data 4194403
[  132.730892] tegra194-vi5 15c10000.vi: corr_err: discarding frame 4, flags: 96, err_data 4194403
[  132.785274] tegra194-vi5 15c10000.vi: corr_err: discarding frame 1, flags: 96, err_data 4194403
[  132.838906] tegra194-vi5 15c10000.vi: corr_err: discarding frame 2, flags: 96, err_data 4194403
[  132.893111] tegra194-vi5 15c10000.vi: corr_err: discarding frame 3, flags: 96, err_data 4194403
[  132.947328] tegra194-vi5 15c10000.vi: corr_err: discarding frame 4, flags: 96, err_data 4194403
[  133.001059] tegra194-vi5 15c10000.vi: corr_err: discarding frame 1, flags: 96, err_data 4194403
[  133.054948] tegra194-vi5 15c10000.vi: corr_err: discarding frame 2, flags: 96, err_data 4194403
[  133.109064] tegra194-vi5 15c10000.vi: corr_err: discarding frame 3, flags: 96, err_data 4194403
[  133.162919] tegra194-vi5 15c10000.vi: corr_err: discarding frame 4, flags: 96, err_data 4194403
[  133.217560] tegra194-vi5 15c10000.vi: corr_err: discarding frame 1, flags: 96, err_data 4194403
[  133.271160] tegra194-vi5 15c10000.vi: corr_err: discarding frame 2, flags: 96, err_data 4194403
[  133.324883] tegra194-vi5 15c10000.vi: corr_err: discarding frame 3, flags: 96, err_data 4194403
[  133.379205] tegra194-vi5 15c10000.vi: corr_err: discarding frame 4, flags: 96, err_data 4194403
[  133.432911] tegra194-vi5 15c10000.vi: corr_err: discarding frame 1, flags: 96, err_data 4194403
[  133.487023] tegra194-vi5 15c10000.vi: corr_err: discarding frame 2, flags: 96, err_data 4194403
[  133.541722] tegra194-vi5 15c10000.vi: corr_err: discarding frame 3, flags: 96, err_data 4194403
[  133.595144] tegra194-vi5 15c10000.vi: corr_err: discarding frame 4, flags: 96, err_data 4194403
[  133.649627] tegra194-vi5 15c10000.vi: corr_err: discarding frame 1, flags: 96, err_data 4194403

<CTRL-C>

trace output:

     kworker/0:0-4     [000] ....   124.497361: rtcpu_nvcsi_intr: tstamp:4210369679 class:GLOBAL type:STREAM_NOVC phy:0 cil:0 st:3 vc:0 status:0x00000001
     kworker/0:0-4     [000] ....   124.497377: rtcpu_nvcsi_intr: tstamp:4210369679 class:CORRECTABLE_ERR type:STREAM_NOVC phy:0 cil:0 st:3 vc:0 status:0x00000001
     kworker/0:0-4     [000] ....   124.497390: rtcpu_nvcsi_intr: tstamp:4210372743 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497402: rtcpu_nvcsi_intr: tstamp:4210372743 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497437: rtcpu_nvcsi_intr: tstamp:4210374565 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497449: rtcpu_nvcsi_intr: tstamp:4210374565 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497461: rtcpu_nvcsi_intr: tstamp:4210377264 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497473: rtcpu_nvcsi_intr: tstamp:4210377264 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497485: rtcpu_nvcsi_intr: tstamp:4210379963 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497497: rtcpu_nvcsi_intr: tstamp:4210379963 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497509: rtcpu_nvcsi_intr: tstamp:4210382663 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497521: rtcpu_nvcsi_intr: tstamp:4210382663 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497533: rtcpu_nvcsi_intr: tstamp:4210385365 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497545: rtcpu_nvcsi_intr: tstamp:4210385365 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497557: rtcpu_nvcsi_intr: tstamp:4210388062 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497570: rtcpu_nvcsi_intr: tstamp:4210388062 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497582: rtcpu_nvcsi_intr: tstamp:4210390762 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497594: rtcpu_nvcsi_intr: tstamp:4210390762 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497606: rtcpu_nvcsi_intr: tstamp:4210393464 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497618: rtcpu_nvcsi_intr: tstamp:4210393464 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497630: rtcpu_nvcsi_intr: tstamp:4210396160 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.497642: rtcpu_nvcsi_intr: tstamp:4210396160 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004

    <...repeated many times...>

     kworker/0:0-4     [000] ....   124.499632: rtcpu_vinotify_event: tstamp:4210559809 tag:FS channel:0x00 frame:1 vi_tstamp:4210369770 data:0x00000013
     kworker/0:0-4     [000] ....   124.499647: rtcpu_vinotify_event: tstamp:4210559950 tag:ATOMP_FS channel:0x00 frame:1 vi_tstamp:4210369773 data:0x00000000
     kworker/0:0-4     [000] ....   124.499660: rtcpu_vinotify_event: tstamp:4210560115 tag:CHANSEL_PXL_SOF channel:0x23 frame:1 vi_tstamp:4210369970 data:0x00000001
     kworker/0:0-4     [000] ....   124.499672: rtcpu_vinotify_event: tstamp:4210560258 tag:RESERVED_19 channel:0x23 frame:1 vi_tstamp:5882830784 data:0x08020001
     kworker/0:0-4     [000] ....   124.499684: rtcpu_nvcsi_intr: tstamp:4210560863 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.499696: rtcpu_nvcsi_intr: tstamp:4210560863 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.499708: rtcpu_nvcsi_intr: tstamp:4210563562 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.499720: rtcpu_nvcsi_intr: tstamp:4210563562 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.499732: rtcpu_nvcsi_intr: tstamp:4210566263 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004

    <...repeated many times...>

vi-output, cere-7464  [000] ....   124.512567: tegra_channel_capture_setup: vnc_id 0 W 640 H 480 fmt 10
     kworker/0:0-4     [000] ....   124.553038: rtcpu_nvcsi_intr: tstamp:4210587863 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.553070: rtcpu_nvcsi_intr: tstamp:4210590562 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.553086: rtcpu_nvcsi_intr: tstamp:4210590562 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.553099: rtcpu_nvcsi_intr: tstamp:4210593262 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.553111: rtcpu_nvcsi_intr: tstamp:4210593262 class:CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
     kworker/0:0-4     [000] ....   124.553124: rtcpu_nvcsi_intr: tstamp:4210595959 class:GLOBAL type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004
1 Like
3

You can check the REG NVCSI_STREAM_0_INTR_STATUS_VC0_0 from TRM that tell the err_intr_stat_pd_crc_err_vc0.
It could be the package have crc problem.

CORRECTABLE_ERR type:STREAM_VC phy:0 cil:0 st:3 vc:0 status:0x00000004

4

Thank you for the hint. The NVCSI_STREAM_0_INTR_STATUS_VC0_0 did not give me any info but in the TRM I found another register (NVCSI_STREAM_3_PF_CRC_0) that could give me the calculated and the received frame CRC.

Reading Register NVCSI_STREAM_3_PF_CRC_0

cmd: devmem2 0x15a281d8 w

result:

/dev/mem opened.
Memory mapped at address 0x7f8bca9000.
Value at address 0x15A281D8 (0x7f8bca91d8): 0x631EA801

Which showed that the calculated and the received CRC did not match.

calculated CRC: 0x631E
received CRC: 0xA801

After some investigation on the FPGA side, we discovered that the byte order used to feed the CRC engine was wrong. This explained why sending the same byte twice did work since swapping these bytes has no effect.
When fixed, we repeated the test…

cmd: devmem2 0x15a281d8 w

result:

/dev/mem opened.
Memory mapped at address 0x7fa164f000.
Value at address 0x15A281D8 (0x7fa164f1d8): 0x631E631E

calculated CRC: 0x631E
received CRC: 0x631E

Issue solved! Thanks for the effort.

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