rtw88: update man page for loader tunable for >4GB of main memory
Mention the loader tunable from 6a50157090
that needs to be set for system with more than 4GB of physical memory.
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
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6a50157090
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@ -24,7 +24,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd March 31, 2022
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.Dd May 5, 2022
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.Dt rtw88 4
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.Os
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.Sh NAME
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@ -78,11 +78,27 @@ While
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supports all 802.11 a/b/g/n and ac
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the compatibility code currently only supports 802.11 a/b/g modes.
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Support for 802.11 n/ac is to come.
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.Sh LOADER TUNABLES
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.Bl -tag -width indent
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.It Va compat.linuxkpi.skb.mem_limit
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If you are running a 64bit system with more than 4GB of main mmeory
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you need to set this tunable to
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.Sy 1
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in
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.Xr loader.conf 5
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and reboot once to make it effective.
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This tunable will work around a problem with DMA and limit allocations
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for network buffer memory to the lower 32bit of physical memory and
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make the driver work.
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.El
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.Sh BUGS
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Certainly.
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.Pp
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Does not seem to work (reliably) on machines with more than 4GB of
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main memory.
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See in the
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.Sx LOADER TUNABLES
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section above.
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.Sh SEE ALSO
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.Xr rtw88fw 4 ,
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.Xr wlan 4 ,
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