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Hi, |
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while trying to get a mt7601sta (UWN200 WiFi dongle) driver running |
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and working I came accross this in the dmesg output: |
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|
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[ 9.931938] usb 2-1: device v148f p7601 is not supported |
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[ 9.931976] usb 2-1: New USB device found, idVendor=148f, idProduct=7601 |
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[ 9.931994] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 |
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[ 10.077532] rtusb init rt2870 ---> |
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[ 10.079338] |
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|
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=== pAd = e0c58000, size = 860808 === |
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|
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[ 10.079939] ERROR: 256 KiB atomic DMA coherent pool is too small! |
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Please increase it with coherent_pool= kernel parameter! |
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[ 10.079968] <-- ERROR in Alloc Bulk buffer for HTTxContext! |
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[ 10.079983] ---> RTMPFreeTxRxRingMemory |
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[ 10.080026] <--- RTMPFreeTxRxRingMemory |
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[ 10.080040] ERROR!!! Failed to allocate memory - TxRxRing |
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|
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But |
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|
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cat /proc/cmdline |
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shows: |
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console=tty1 root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait fixrtc capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN,BB-BONE-EMMC-2G,coherent_pool=2M |
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(this is an embedded device, thats why there are the other parameters |
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around...) |
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I do not find any way to set this parameter while compiling the |
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kernel. And setting the kernel parameter seems not to work either... |
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Lost? |
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|
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...or am I only blind... ? ;) |
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How can I increase the cohorent pool size successfully? |
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|
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Best regards, |
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mcc |
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PS: The driver sources are not included in the kernel and have to be |
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compiled externally/extra... |
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