Hello Josef,
unfortunately I still have no possibility to get LOG output via serial, I only can print the LOG to screen and I'm too lazy to type the full log ;). However, I did some investigation into the problem. The device is stopped because of this error:
dma_map_single: virtual address b008a78 not registered for DMA, called from:
1070bfc
def_error: Error sending BT_CONFIG: enqueu_hcmd failed: -12
Where dma_map_single is called by enqueu_hcmd. So the problem is related to DMA,
Btw, I also tried to increase the memory quota to ensure there is enough memory.
Ask if you need any more info from the logs, then I will type or do a photo)
Cheers Christian
On Monday 01 December 2014 16:50:14 Josef Söntgen wrote:
Hallo Christian,
On 12/01/14 16:32, Christian Menard wrote:
I'm experimenting with the new iwlwifi driver on a device with 7260 card. I enabled support for this card as mentioned in the release notes and added the corresponding firmware file iwlwifi-7260-8.ucode. Unfortunately the driver is not working out of the box for this card.
The problem breaks down to a failure during DMA memory allocation. Here an
excerpt from wifi_drv's log:
Slab too large 131072 reqested 86032 cached 0 dma alloc 81920 failed Slab too large 131072 reqested 105428 cached 0 dma alloc 101316 failed .... Slab too large 131072 reqested 86032 cached 0 dma alloc 81920 failed Slab too large 262144 reqested 175072 cached 0 dma alloc 170960 failed
I naively increased maximum slab size by setting SLAB_STOP_LOG2 in lxc_emul.cc> to 20. Then failure changes to:
Failed to get slab for 262144 dma alloc: 170960 failed
So as it appears such a large slab cannot be allocated. Why is that? What would be the right way (tm) to resolve this issue?
Could you please attach the whole log file? These error messages are normally harmless — the driver tries to load the firmware all at once and falls back to loading the it in smaller chunks if that is not possible. I suspect the issue lies elsewhere.
Regards Josef
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