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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: buildroot-bounces@buildroot.org Sender: "buildroot" On Tue, Sep 03, 2024 at 09:50:53PM +0200, Arnout Vandecappelle wrote: > > > On 03/09/2024 21:26, Thomas Petazzoni via buildroot 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. > > We don't really have a policy or rules at the moment. I've added this to > the topics of the Buildroot Developer meeting in Vienna. See my reply to Thomas where I suggest to create a BR2_PACKAGE_EUDEV_PREDICTABLE_NIC_NAMES Kconfig which is default not set. I think that would be a nice policy / solution. > > For the time being, I think we generally prefer to have a kernel config > that is as much as possible custom for the target board. Thus, we also > generally prefer to not require loading modules. Certainly for ethernet - > having ethernet as a module makes nfsroot impossible. > > So I've marked patches 3/5 and 4/5 as Rejected. > > Feel free to give arguments why we should prefer these drivers as module though! Sure, we could keep the Ethernet driver as built-in. I still think it is a really good idea to enable udev though. rock5b is currently using arm64 defconfig as kernel config. Just enabling udev shows this in lsmod: # lsmod Module Size Used by Not tainted hantro_vpu 270336 0 rockchipdrm 167936 0 v4l2_jpeg 16384 1 hantro_vpu v4l2_vp9 20480 1 hantro_vpu v4l2_h264 12288 1 hantro_vpu analogix_dp 36864 1 rockchipdrm v4l2_mem2mem 36864 1 hantro_vpu dw_mipi_dsi 20480 1 rockchipdrm panthor 118784 0 videobuf2_dma_contig 16384 1 hantro_vpu dw_hdmi 40960 1 rockchipdrm videobuf2_memops 12288 1 videobuf2_dma_contig cec 53248 1 dw_hdmi drm_gpuvm 32768 1 panthor videobuf2_v4l2 28672 2 hantro_vpu,v4l2_mem2mem drm_exec 12288 2 panthor,drm_gpuvm drm_display_helper 167936 3 rockchipdrm,analogix_dp,dw_hdmi drm_shmem_helper 24576 1 panthor drm_dma_helper 20480 1 rockchipdrm crct10dif_ce 12288 1 videodev 253952 3 hantro_vpu,v4l2_mem2mem,videobuf2_v4l2 rockchip_saradc 16384 0 gpu_sched 40960 1 panthor videobuf2_common 57344 5 hantro_vpu,v4l2_mem2mem,videobuf2_dma_contig,videobuf2_memops,videobuf2_v4l2 drm_kms_helper 188416 7 rockchipdrm,analogix_dp,dw_mipi_dsi,dw_hdmi,drm_display_helper,drm_shmem_helper,drm_dma_helper mc 57344 5 hantro_vpu,v4l2_mem2mem,videobuf2_v4l2,videodev,videobuf2_common drm 552960 12 rockchipdrm,analogix_dp,dw_mipi_dsi,panthor,dw_hdmi,drm_gpuvm,drm_exec,drm_display_helper,drm_shmem_helper,drm_dma_helper,gpu_sched,drm_kms_helper industrialio_triggered_buffer 12288 1 rockchip_saradc backlight 20480 2 drm_display_helper,drm phy_rockchip_usbdp 20480 2 phy_rockchip_naneng_combphy 16384 5 kfifo_buf 12288 1 industrialio_triggered_buffer pwm_fan 16384 0 rtc_hym8563 12288 1 snd_soc_audio_graph_card 16384 0 typec 77824 1 phy_rockchip_usbdp snd_soc_rockchip_i2s_tdm 20480 2 snd_soc_simple_card_utils 28672 1 snd_soc_audio_graph_card snd_soc_es8316 40960 1 rockchip_thermal 24576 0 spi_rockchip_sfc 12288 0 rk805_pwrkey 12288 0 Without udev (i.e. with the current buildroot rock5b_defconfig) none of these modules will be loaded. Kind regards, Niklas _______________________________________________ buildroot mailing list buildroot@buildroot.org https://lists.buildroot.org/mailman/listinfo/buildroot