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Which vendors maintain SDIO WiFi in mainline stable kernel

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Hi,

I could not understand why so many large WiFi chip vendors retreat to
stop maintaining WiFi SDIO chips to mainline Linux kernel, and to
settle it's chip support to out of the tree, use its own SDK and
proprietary kernel tree to source.codeaurora.org or private repository
which are not compatible to mainline stable kernel, the kernel
configures are also different.

I looked at the following link, the mwifiex and mwifiex_sdio support
the Marvell (NXP) 88W88 chipset, but only kernel 4.19 was able to
build and to run, kernel 5 cannot support 88W88 chipset, any more.
Same to Qualcomm, the old Atheros WiFi modules are supported, the
QCA-9377-3 chipset is in source.codeaurora.org only supported by old
kernel 4.9.

Given the OE/Yocto poky kernel build is based on a mainline stable
kernel repository, how can I build kernel 5 for 88W88 chipset or
QCA-9377-3 from source.codeaurora.org or private repository? Or which
WiFi vendors are still well maintaining the WiFi chips for kernel 5,
the only sensible solution is to switch WiFi SDIO chips? Appreciate
your advice and comments.

https://wireless.wiki.kernel.org/en/users/drivers

Thank you very much.

Kind regards,

jupiter



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