(base) root@davinci-mini:~# lsmod | grep ascend_vdp_drm
ascend_vdp_drm        303104  0
drv_osal              319488  41 drv_isp,drv_mipi_tx,drv_vpss,drv_tde,drv_mipi_rx,drv_aenc,ascend_vdp_drm,drv_vgs,drv_vdec_adapt,drv_rc,drv_base,drv_vdec,drv_dcc,drv_gdc,drv_aio,drv_vo,drv_dvpp_comm,drv_vedu,ascend_camera_gyrodis,drv_jpegd,drv_chnl,drv_region,drv_ao,drv_h265e,ascend_camera_motionfusion,drv_pngd,drv_acodec,drv_h264e,drv_adec,ascend_vdp_hifb,drv_vpc,drv_venc,media_drval,drv_dis,drv_vi,drv_hdmi,drv_vfmw,vpc,drv_ai,drv_sys,drv_jpege
(base) root@davinci-mini:~# dmesg |grep ascend_vdp_drm
[    4.866688] ascend_vdp_drm: Unknown symbol osal_memcmp (err -2)
[    4.866708] ascend_vdp_drm: Unknown symbol osal_vfree_ (err -2)
[    4.866771] ascend_vdp_drm: Unknown symbol osal_strlen (err -2)
[    4.866789] ascend_vdp_drm: Unknown symbol osal_gettimeofday (err -2)
[    4.866810] ascend_vdp_drm: Unknown symbol osal_spin_lock_destroy (err -2)
[    4.866832] ascend_vdp_drm: Unknown symbol osal_msleep (err -2)
[    4.866852] ascend_vdp_drm: Unknown symbol osal_down (err -2)
[    4.866883] ascend_vdp_drm: Unknown symbol osal_atomic_set (err -2)
[    4.866897] ascend_vdp_drm: Unknown symbol osal_sema_destroy (err -2)
[    4.866911] ascend_vdp_drm: Unknown symbol osal_atomic_init (err -2)
[    4.866925] ascend_vdp_drm: Unknown symbol osal_wait_init (err -2)
[    4.866960] ascend_vdp_drm: Unknown symbol osal_sched_clock (err -2)
[    4.866983] ascend_vdp_drm: Unknown symbol osal_div_u64 (err -2)
[    4.866997] ascend_vdp_drm: Unknown symbol osal_vmalloc_ (err -2)
[    4.867015] ascend_vdp_drm: Unknown symbol osal_wait_timeout_interruptible (err -2)
[    4.867032] ascend_vdp_drm: Unknown symbol osal_spin_lock_init (err -2)
[    4.867059] ascend_vdp_drm: Unknown symbol osal_ioremap_nocache (err -2)
[    4.867074] ascend_vdp_drm: Unknown symbol osal_wakeup (err -2)
[    4.867090] ascend_vdp_drm: Unknown symbol osal_up (err -2)
[    4.867111] ascend_vdp_drm: Unknown symbol osal_sema_init (err -2)
[    4.867138] ascend_vdp_drm: Unknown symbol osal_msecs_to_jiffies (err -2)
[    4.867155] ascend_vdp_drm: Unknown symbol osal_wait_destroy (err -2)
[    4.867168] ascend_vdp_drm: Unknown symbol osal_atomic_destroy (err -2)
[    4.867204] ascend_vdp_drm: Unknown symbol osal_kthread_destroy (err -2)
[    4.867219] ascend_vdp_drm: Unknown symbol osal_kthread_create (err -2)
[    4.867233] ascend_vdp_drm: Unknown symbol osal_printk (err -2)
[    4.867246] ascend_vdp_drm: Unknown symbol osal_klib_fwrite (err -2)
[    4.867271] ascend_vdp_drm: Unknown symbol osal_udelay (err -2)