[LEDE-DEV] imx6: fail to start IBSS link

[Koen Vandeputte]

On 2017-02-17 17:19, Koen Vandeputte wrote:
>
>
>> Koen,
>>
>> Can you try to disable MSI? I've seen issues with it in the past for
>> IMX6 and I typically leave it disabled as it doesn't buy us anything
>> and can instead hurt performance. If I recall, I think its now
>> 'required' by the IMX6 PCIe driver so it may take a kernel change to
>> disable it. Other than that, how does mainline 4.9 behave and what
>> card/chipset are you using?
>>
>> Tim
>
> Hi Tim,
>
> I will try with disabled MSI and let you know.
> The earliest time I see in my planning is next week Friday.
>
> fyi, I'm testing on 3 different Ventana boards:
>
> - GW5100    (dualcore - single PCIe)
> - GW5200    (dualcore - Dual PCIe)
> - GW5410    (quadcore - 6x PCIe)
>
> All 3 boards utilize a single MiktroTik R11e-5HnD radio (AR 9300 based)
>
>
> Other issues seen so far compared to kernel 4.4:
> - A simple "reboot" doesn't work.  UART output shows "Reboot failed" 
> and the board stalls. Powercycle is needed
> - UART DMA disabled is required to avoid some boot errors (I've made a 
> custom backport from your upstream patch fixing this, but not 
> submitted here yet)
>
> General issues in kernels 4.4 & 4.9
> - Even using the latest UBI FS sources + using the Sync option in 
> bootarg, files can get corrupted on a power cut.  If the corrupted 
> file is a boot file .. :)
>
>
>
> Other than this it runs pretty stable :)
>
Tim,

I found 1 more issue on 4.4 & 4.9 kernels:

https://lists.debian.org/debian-arm/2016/02/msg00000.html

I'm also seeing this on 4.4 kernel.
It can take up to a few days before it triggers normally, but I have a 
setup running which reproduces this within a few hours.

I've made a patch which increases the timeout in the FEC driver just for 
testing .. but it still occurs causing the port to be disabled suddenly.

> Koen