Re: [gentoo-user] Re: Cohorent pool size too small...

[meino.cramer@gmx.de]

walt <w41ter@gmail.com> [14-10-05 16:16]:
> On 10/05/2014 06:52 AM, meino.cramer@gmx.de wrote:
> > Hi,
> > 
> > while trying to get a mt7601sta (UWN200 WiFi dongle) driver running
> > and working I came accross this in the dmesg output:
> > 
> > [    9.931938] usb 2-1: device v148f p7601 is not supported
> 
> This looks to me like it's the real error, not the one below.

What I dont understand is: If I provide the kernel driver...why does
the kernel "decides" not to support the hardware the driver itsself
supports...?

By the way: I hacked the kernel to provide more coherent pool size
with the effect that NO module was loaded anymore...without any trace
in the dmesg out (beside the greater pool size itsself...)...

best regards,
mcc



> 
> > [    9.931976] usb 2-1: New USB device found, idVendor=148f, idProduct=7601
> > [    9.931994] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> > [   10.077532] rtusb init rt2870 --->
> > [   10.079338] 
> > 
> > === pAd = e0c58000, size = 860808 ===
> > 
> > [   10.079939] ERROR: 256 KiB atomic DMA coherent pool is too small!
> > Please increase it with coherent_pool= kernel parameter!
> > [   10.079968] <-- ERROR in Alloc Bulk buffer for HTTxContext!
> > [   10.079983] ---> RTMPFreeTxRxRingMemory
> > [   10.080026] <--- RTMPFreeTxRxRingMemory
> > [   10.080040] ERROR!!! Failed to allocate memory - TxRxRing
> > 
> > 
> > But 
> > 
> > cat /proc/cmdline 
> > 
> > shows:
> > 
> > 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
> > 
> > (this is an embedded device, thats why there are the other parameters
> > around...)
> > 
> > I do not find any way to set this parameter while compiling the
> > kernel. And setting the kernel parameter seems not to work either...
> > 
> > Lost?
> > 
> > ...or am I only blind... ? ;)
> > 
> > How can I increase the cohorent pool size successfully?
> > 
> > Best regards,
> > mcc
> > 
> > PS: The driver sources are not included in the kernel and have to be
> > compiled externally/extra...
> > 
> > 
> > 
> 
> 
>