ACK/Cmnt: [SRU][F/raspi][G/raspi][H/raspi][PATCH 0/1] No iwilwifi driver in Linux 5.4.0-1034-raspi (LP: #1925209)

[Juerg Haefliger]

On Thu, 22 Apr 2021 07:02:42 -0600
Tim Gardner <tim.gardner at canonical.com> wrote:

> Acked-by: Tim Gardner <tim.gardner at canonical.com>
> 
> Enabling modules isn't always risk free.

Yes. That's what I tried to elaborate on in the LP bug. Fell free to amend it.


> One should note that PCI 
> devices are hot-plugged. If there is an early bug in the module init, or 
> it mis-handles some incoming packet, odd crashes could ensue. I have 
> seen this with staging drivers.

PCI hot-plugging is optional and glancing over the few and partial schematics
that are available for the CM4 and its IO board I doubt that it's supported.

...Juerg


> rtg
> 
> On 4/22/21 6:30 AM, Juerg Haefliger wrote:
> > [Impact]
> > 
> > The Raspberry Pi CM4 exposes a PCIe bus and the AX200 Wifi plugin card should therefore be supported.
> > 
> > [Test Plan]
> > 
> > $ modinfo iwlwifi
> > modinfo: ERROR: Module iwlwifi not found.
> > 
> > [Where Problems Could Occur]
> > 
> > It's a new module which might need firmware. If that blob is not available, users might ee dmesg errors. And obviously if the module is buggy all hell could break loose.
> > 
> > [Original description]
> > 
> > Hello,
> > 
> > I have installed Ubuntu Core 20 edge built on 19.04.2021(https://cdimage.ubuntu.com/ubuntu-core/20/edge/) in Raspberry Pi CM4.
> > 
> > Operating System: Ubuntu Core 20
> > Kernel: Linux 5.4.0-1034-raspi
> > Architecture: arm64
> > 
> > I have inserted a Intel AX200 Wifi Adapter in PCIe slot in Raspberry Pi CM4. The device is recognised
> > 
> > $pciutils-snap.lspci
> > 00:00.0 PCI bridge: Broadcom Inc. and subsidiaries Device 2711 (rev 20)
> > 01:00.0 Network controller: Intel Corporation Wi-Fi 6 AX200 (rev 1a)
> > 
> > But the iwlwifi driver is not available.
> > 
> > $lsmod | grep iwl
> > $
> > 
> > iwlwifi is the driver needed for intel wireless chips(https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi).
> > 
> > Is there a possibility to enable the iwlwifi driver?
> > 
> > Thanks
> > Hema
> > 
> > Juerg Haefliger (1):
> >    UBUNTU: [Config] raspi: Set IWLWIFI=m
> > 
> >   debian.raspi/config/config.common.ubuntu | 10 +++++++++-
> >   1 file changed, 9 insertions(+), 1 deletion(-)
> >   
> 

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