[Bug 243992] iwm(4): iwm_pcie_load_section: Could not load the [0] uCode section (Intel Wireless-AC 9560)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243992

zxystd <zxystd at foxmail.com> changed:

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                 CC|                            |zxystd at foxmail.com

--- Comment #19 from zxystd <zxystd at foxmail.com> ---
I have fix this issue in OpenIntelWireless/itlwm project:
https://github.com/OpenIntelWireless/itlwm/commit/1fc63d576975d56578ce2048f00f83e7ca550d97

I am not sure if it is a hardware bug for newer intel wireless card, for
9560ac-cnvi and later Gen2 cards, MSI-X interrupt mode is enable by default,
Intel wireless drivers on linux/Windows are supported and using MSI-X interrupt
default, when rebooting to freebsd, iwm on freebsd only support MSI interrupt
but the hardware is configure as MSI-X, so the interrupt will never happened
and caused the issue.
Here are two solutions:
1. Implement MSI-X interrupt mode on iwm.
2. Disable MSI-X when init the hardware, and it is the solution what I am
using.

Thanks,
zxystd

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