root@am335x-evm:~# zcat /proc/config.gz | grep "cpp"
root@am335x-evm:~# zcat /proc/config.gz | grep -i "cpp"                                                                                        
CONFIG_USB_TI_CPPI41_DMA=y
CONFIG_TI_CPPI41=y
root@am335x-evm:~# dmesg | grep "CPP"
root@am335x-evm:~# dmesg | grep "musb"
[   67.817354] musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
[   67.817422] musb-hdrc: MHDRC RTL version 2.0 
[   67.817442] musb-hdrc: setup fifo_mode 4
[   67.817476] musb-hdrc: 28/31 max ep, 16384/16384 memory
[   67.856708] musb-hdrc musb-hdrc.0.auto: MUSB HDRC host driver
[   67.862625] musb-hdrc musb-hdrc.0.auto: new USB bus registered, assigned bus number 1
[   68.356898] musb-hdrc musb-hdrc.0.auto: VBUS_ERROR in a_wait_vrise (81, <SessEnd), retry #1, port1 00000104
[   68.418819] musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
[   68.418888] musb-hdrc: MHDRC RTL version 2.0 
[   68.418908] musb-hdrc: setup fifo_mode 4
[   68.418941] musb-hdrc: 28/31 max ep, 16384/16384 memory
[   68.419319] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[   68.509314] musb-hdrc musb-hdrc.0.auto: VBUS_ERROR in a_wait_vrise (81, <SessEnd), retry #2, port1 00000104
[   68.568154] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 2
[   68.661759] musb-hdrc musb-hdrc.0.auto: VBUS_ERROR in a_wait_vrise (81, <SessEnd), retry #3, port1 00000104
[   68.814187] musb-hdrc musb-hdrc.0.auto: VBUS_ERROR in a_wait_vrise (80, <SessEnd), retry #3, port1 0008010c
[   69.265956] usb 2-1: new high-speed USB device number 2 using musb-hdrc
[   73.625228] input: USB 2.0 Camera as /devices/platform/ocp/47400000.usb/47401c00.usb/musb-hdrc.1.auto/usb2/2-1/2-1:1.0/input/input0
root@am335x-evm:~# zcat /proc/config.gz | grep -i "musb"                                                                                    
CONFIG_USB_MUSB_HDRC=m
# CONFIG_USB_MUSB_HOST is not set
# CONFIG_USB_MUSB_GADGET is not set
CONFIG_USB_MUSB_DUAL_ROLE=y
CONFIG_USB_MUSB_OMAP2PLUS=m
CONFIG_USB_MUSB_AM35X=m
CONFIG_USB_MUSB_DSPS=m
CONFIG_USB_MUSB_AM335X_CHILD=m
# MUSB DMA mode
# CONFIG_MUSB_PIO_ONLY is not set
root@am335x-evm:~# dmesg | grep -i "cpp"                                                                                                       
root@am335x-evm:~# dmesg | grep -i "dma"
[    3.228665] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    3.399559] edma 49000000.edma: TI EDMA DMA engine driver
root@am335x-evm:~# lsmod | grep -i "dma"                                                                                                       
root@am335x-evm:~# lsmod | grep -i "musb"
musb_dsps              14456  0
musb_hdrc             155109  1 musb_dsps
udc_core               21384  2 musb_hdrc,libcomposite
usbcore               395566  2 uvcvideo,musb_hdrc
musb_am335x             1743  0
root@am335x-evm:~# ls