bradb Basic Member Posts:203  
| 22 Oct 2014 01:08 PM |
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Subject
DM37LINUX-1038: USB Gadget Drivers (Ethernet Gadget (with CDC Ethernet support)) with USB OTG as Host may fail
Product
DM37x Torpedo and DM37x Torpedo + Wireless
Software OS
DM37x Linux 2.4-3 BSP
Description
Customer's looking to use Ethernet Gadget (with CDC Ethernet support) with USB OTG as Host may see a similar error following a ping when using Linux 2.4-3 release.
[ 112.575347] musb_ep_program 834: broken !rx_reinit, ep2 csr a200
[ 112.586914] musb_ep_program 834: broken !rx_reinit, ep2 csr a000
[ 113.567474] musb_ep_program 834: broken !rx_reinit, ep2 csr a200
[ 114.568634] musb_ep_program 834: broken !rx_reinit, ep2 csr a000
[ 115.569824] musb_ep_program 834: broken !rx_reinit, ep2 csr a200
[ 116.570983] musb_ep_program 834: broken !rx_reinit, ep2 csr a000
[ 117.572326] musb_ep_program 834: broken !rx_reinit, ep2 csr a200
[ 117.599212] musb_ep_program 834: broken !rx_reinit, ep2 csr a000
[ 118.573486] musb_ep_program 834: broken !rx_reinit, ep2 csr a200
[ 119.574676] musb_ep_program 834: broken !rx_reinit, ep2 csr a000
This error was seen when using the default BSP and only selecting CONFIG_USB_USBNET, CONFIG_USB_NET_CDCETHER, and CONFIG_USB_NET_RNDIS_HOST=y in the USB Network Adapters section of the kernel config file. Simply connect two DM37x systems together using a USB OTG A to mini-B cable and a USB OTG A to mini-A cable. Insert the USB mini B plug into the DM37x client system and the USB A plug into the host adapter. The host adapter's mini A plug is then inserted into the DM37x host system.
Selection of the Ethernet Gadget (with CDC Ethernet support)
Prompt: USB Gadget Drivers
-> Device Drivers -> USB support (USB_SUPPORT [=y]) -> USB Gadget Support (USB_GADGET [=y])
Word-around
This issue has been reported as being seen when using kernels through 3.3.0. The suggested workaround is to disable the MUSB DMA.
Old configuration:
# CONFIG_MUSB_PIO_ONLY is not set
# CONFIG_USB_UX500_DMA is not set
CONFIG_USB_INVENTRA_DMA=y
CONFIG_MUSB_USE_SYSTEM_DMA_WORKAROUND=y
# CONFIG_USB_TI_CPPI_DMA is not set
New configuration:
CONFIG_MUSB_PIO_ONLY=y
# CONFIG_USB_INVENTRA_DMA is not set
# CONFIG_MUSB_USE_SYSTEM_DMA_WORKAROUND is not set
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