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

Koen Vandeputte koen.vandeputte at ncentric.com
Fri Feb 17 08:19:15 PST 2017

> 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 :)


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