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Opened 3 years ago

Last modified 3 years ago

#18673 new defect

comgt/chat not working with /dev/cdc-wdm0 only on brcm47xx

Reported by: anonymous Owned by: developers
Priority: normal Milestone: Chaos Calmer 15.05
Component: kernel Version: Trunk
Keywords: BRCM47XX HUAWEI_CDC_NCM NCM COMGT CHAT Cc:

Description

After switch to kernel 3.14, the new NCM and huawei_cdc_ncm driver, which exports the "/dev/cdc-wdm0" command-channel is not working correctly on brcm47xx-platforms.

This is true for kernel 3.10+huawei-patches, 3.14 and 3.18

This not a Huawei E327x-only problem, Sierra and other ncm devices are affected, too!

The command-channel is perfect working on ar7xx and other platforms since kernel 3.10

Something (old) must be different between this platforms, eventualy an alignment problem in the ncm/huawei-driver or a combination with comgt/chat.

Trying to communicate with minicom and "echo" to the device is working. So it looks like the RX-functions are not working.

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Change History (2)

comment:1 Changed 3 years ago by anonymous

stty: /dev/cdc-wdm0: Inappropriate ioctl for device

is the usual error on brcm47xx

comment:2 Changed 3 years ago by malaakso

Known problem. Work is still in progress with the whole NCM support:

https://lists.openwrt.org/pipermail/openwrt-devel/2014-December/030273.html

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