Hi, In any case, I double checked by setting only 1 line in the uEnv.txt file the ouput for cat /proc/cmdline is console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet musb_hdrc.use_dma=0 usbcore.autosuspend=-1 But same troubles as before Regards Josep M. On Fri, Oct 19, 2018 at 8:42 PM Bin Liu <b-liu@xxxxxx> wrote: > > On Fri, Oct 19, 2018 at 02:26:51PM -0400, Alan Stern wrote: > > On Fri, 19 Oct 2018, Bin Liu wrote: > > > > > On Fri, Oct 19, 2018 at 07:19:17PM +0200, Josep M. Mirats Tur wrote: > > > > Hi Bin, > > > > > > > > I included the following line in the /boot/uEnv.txt file (attached for > > > > your info): > > > > cmdline=musb_hdrc.use_dma=0 > > > > > > I am not sure about the 'cmdline=' part. Anyway, after your board is > > > booted, use command 'cat /proc/cmdline' to check if your setting is > > > correct. > > > > There already was a "cmdline=" entry in the file: > > > > > > cmdline=coherent_pool=1M net.ifnames=0 quiet > > > > > > > > #In the event of edid real failures, uncomment this next line: > > > > #cmdline=coherent_pool=1M net.ifnames=0 quiet video=HDMI-A-1:1024x768@60e > > > > > > > > #Use an overlayfs on top of a read-only root filesystem: > > > > #cmdline=coherent_pool=1M net.ifnames=0 quiet overlayroot=tmpfs > > > > > > > > ##enable Generic eMMC Flasher: > > > > ##make sure, these tools are installed: dosfstools rsync > > > > #cmdline=init=/opt/scripts/tools/eMMC/init-eMMC-flasher-v3.sh > > > > > > > > #jmmt disable dma for musb > > > > cmdline=musb_hdrc.use_dma=0 > > > > The "musb_hdrc.use_dma=0" should have been appended to the earlier > > entry, not added separately. > > right, but this is just a testing to disable cppi dma, other existing > cmdline params seem not related to usb, so I think it is okay to > overwrite. > > Regards, > -Bin.
