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dmarc=pass (p=quarantine dis=none) header.from=wdc.com X-Mailman-Original-Authentication-Results: smtp4.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=wdc.com header.i=@wdc.com header.a=rsa-sha256 header.s=dkim.wdc.com header.b=cpWu2O0K; dkim=pass (1024-bit key, unprotected) header.d=sharedspace.onmicrosoft.com header.i=@sharedspace.onmicrosoft.com header.a=rsa-sha256 header.s=selector2-sharedspace-onmicrosoft-com header.b=jZMlR0zA X-Mailman-Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=wdc.com; Subject: Re: [Buildroot] [PATCH 3/5] configs/rock5b: enable eudev to enable automatic module loading X-BeenThere: buildroot@buildroot.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion and development of buildroot List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Niklas Cassel via buildroot Reply-To: Niklas Cassel Cc: Niklas Cassel , Damien Le Moal , Kilian Zinnecker , Thomas Petazzoni , Niklas Cassel via buildroot Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: buildroot-bounces@buildroot.org Sender: "buildroot" On Tue, Sep 03, 2024 at 11:06:13PM +0200, Arnout Vandecappelle wrote: > > > On 03/09/2024 21:56, Niklas Cassel wrote: > > On Tue, Sep 03, 2024 at 09:26:11PM +0200, Thomas Petazzoni wrote: > > > On Mon, 2 Sep 2024 12:44:31 +0200 > > > Niklas Cassel via buildroot wrote: > > > > > > > From: Niklas Cassel > > > > > > > > The arm64 defconfig enables both the R8169 Ethernet driver and the > > > > PHY_ROCKCHIP_NANENG_COMBO_PHY PHY driver as modules. > > > > > > > > Enable udev so that these modules will get automatically loaded by udev > > > > after the rootfs is mounted from the SD card. > > > > > > > > This way, we do not need to build these modules as built-in, and we also > > > > get the benefit that any device plugged in to the PCIe slot will get > > > > automatically loaded. > > > > > > > > Signed-off-by: Niklas Cassel > > > > > > I'm not sure what we want to do here, especially when this ends up > > > needing net.ifnames=0 that you add in PATCH 4/5. > > > > > > We do have already a small number of defconfigs that enable eudev. So > > > far we only use net.ifnames=0 in 4 configurations. > > > > > > Basically, I'm trying to make sure we remain consistent and have a > > > policy that applies to all defconfigs rather than ad-hoc solutions that > > > are different for each and every defconfig. That's why I'm a bit > > > reluctant with applying your patches as-is because they only solve the > > > specific case of this defconfig, in a specific way, without creating a > > > clear rule that all defconfigs meeting a specific situation should > > > follow. > > > > (Replying with the email that I have subscribed to the list this time.) > > > > > > An alternative to specify net.ifnames=0 on the kernel command line > > (to disable udev predictable NIC names), is to create an empty file: > > /etc/udev/rules.d/80-net-name-slot.rules > > Well, I think Thomas' comment was primarily about whether we should enable > eudev and dynamically load modules rather than using builtins. For boards that support USB, PCIe and HDMI, I think it is a good default to enable udev (or mdev), as you could see from my other email, enabling udev will load 45 different kernel modules. If we don't enable udev, lsmod will show 0 loaded kernel modules. I don't think we can enable everything as built-in, especially since a user can plug in basically anything in the PCIe slot or USB slot. (But I agree that keeping e.g. Ethernet as built-in is good for NFS root.) E.g. I can plug in a USB to Ethernet adapter, and with udev enabled, the correct kernel module gets loaded automatically. > > Passing net.ifnames=0 is probably the easiest way to disable predictable > NIC names. Only, it's surprising that we have something like 25 defconfigs > that enable eudev, but only 4 of them enable that option... We should > preferably have one "normal" way that this is done. > > > What is BTW not clear to me is _why_ you don't want predictable names. > What's wrong with BR2_SYSTEM_DHCP="enp0s31f6"? Well, if you do a: $ git grep BR2_SYSTEM_DHCP you see that everyone except: configs/ls1028ardb_defconfig:BR2_SYSTEM_DHCP="eno0" is using eth0. But sure, it would be possible to specify the predictable ifname. I guess that it is just a bit unintuitive that you would need to change BR2_SYSTEM_DHCP="eth0" to something else if you happen to enable eudev. (While if you have mdev or neither mdev or udev, eth0 works fine.) Kind regards, Niklas _______________________________________________ buildroot mailing list buildroot@buildroot.org https://lists.buildroot.org/mailman/listinfo/buildroot