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rtw88: update man page for loader tunable for >4GB of main memory

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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
This commit is contained in:
Bjoern A. Zeeb 2022-05-05 21:17:40 +00:00
parent 6a50157090
commit 0881eb9665
1 changed files with 17 additions and 1 deletions
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18
share/man/man4/rtw88.4
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@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd March 31, 2022
.Dd May 5, 2022
.Dt rtw88 4
.Os
.Sh NAME
@ -78,11 +78,27 @@ While
supports all 802.11 a/b/g/n and ac
the compatibility code currently only supports 802.11 a/b/g modes.
Support for 802.11 n/ac is to come.
.Sh LOADER TUNABLES
.Bl -tag -width indent
.It Va compat.linuxkpi.skb.mem_limit
If you are running a 64bit system with more than 4GB of main mmeory
you need to set this tunable to
.Sy 1
in
.Xr loader.conf 5
and reboot once to make it effective.
This tunable will work around a problem with DMA and limit allocations
for network buffer memory to the lower 32bit of physical memory and
make the driver work.
.El
.Sh BUGS
Certainly.
.Pp
Does not seem to work (reliably) on machines with more than 4GB of
main memory.
See in the
.Sx LOADER TUNABLES
section above.
.Sh SEE ALSO
.Xr rtw88fw 4 ,
.Xr wlan 4 ,