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Thu, 23 Oct 2025 13:16:36 -0700 (PDT) Message-ID: <82770e98-a9f7-4a89-a076-01394cf6b880@linaro.org> Date: Thu, 23 Oct 2025 22:16:34 +0200 Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1] arm64: defconfig: Enable i.MX95 configs for booting and Ethernet To: Marek Vasut , Alexander Stein , Catalin Marinas , Will Deacon , Shawn Guo , Fabio Estevam , Peng Fan , linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, imx@lists.linux.dev, =?UTF-8?Q?Jo=C3=A3o_Paulo_Gon=C3=A7alves?= , =?UTF-8?Q?Jo=C3=A3o_Paulo_Gon=C3=A7alves?= References: <20251023-upstream-imx95-smarc-defconfig-v1-1-62c6e6f5b315@toradex.com> <3381308.aeNJFYEL58@steina-w> <5d042f21-274e-4b69-849a-3342d77942eb@mailbox.org> <00555ed7-1aee-459a-ae60-0242809d7b85@linaro.org> <07aba8d4-533d-40f7-bcd3-548704d7d228@mailbox.org> <656164be-5ce7-4f9e-b6cd-0eb1b9305132@mailbox.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 23/10/2025 22:05, Marek Vasut wrote: > On 10/23/25 6:01 PM, Krzysztof Kozlowski wrote: >> On 23/10/2025 17:53, Marek Vasut wrote: >>> On 10/23/25 5:32 PM, Krzysztof Kozlowski wrote: >>>> On 23/10/2025 17:27, Marek Vasut wrote: >>>>> On 10/23/25 5:22 PM, Krzysztof Kozlowski wrote: >>>>>> On 23/10/2025 16:03, Alexander Stein wrote: >>>>>>> Hi, >>>>>>> >>>>>>> Am Donnerstag, 23. Oktober 2025, 14:19:15 CEST schrieb João Paulo Gonçalves: >>>>>>>> From: João Paulo Gonçalves >>>>>>>> >>>>>>>> Enable the necessary missing configs for the i.MX95 to boot and also >>>>>>>> have Ethernet working: >>>>>>>> >>>>>>>> * CONFIG_NXP_ENETC4 for the network controller driver >>>>>>>> * CONFIG_NXP_NETC_BLK_CTRL for the NETC hardware domain controller >>>>>>>> * CONFIG_PINCTRL_IMX_SCMI for the pinctrl driver >>>>>>>> * CONFIG_CLK_IMX95_BLK_CTL for the shared hardware domain controller >>>>>>>> >>>>>>>> Signed-off-by: João Paulo Gonçalves >>>>>>>> --- >>>>>>>> arch/arm64/configs/defconfig | 4 ++++ >>>>>>>> 1 file changed, 4 insertions(+) >>>>>>>> >>>>>>>> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig >>>>>>>> index e3a2d37bd10423b028f59dc40d6e8ee1c610d6b8..787d3ae3f5afeac486a905e0943e7b0e1dcee3a9 100644 >>>>>>>> --- a/arch/arm64/configs/defconfig >>>>>>>> +++ b/arch/arm64/configs/defconfig >>>>>>>> @@ -354,8 +354,10 @@ CONFIG_FSL_FMAN=y >>>>>>>> CONFIG_FSL_DPAA_ETH=y >>>>>>>> CONFIG_FSL_DPAA2_ETH=y >>>>>>>> CONFIG_FSL_ENETC=y >>>>>>>> +CONFIG_NXP_ENETC4=m >>>>>>>> CONFIG_FSL_ENETC_VF=y >>>>>>>> CONFIG_FSL_ENETC_QOS=y >>>>>>>> +CONFIG_NXP_NETC_BLK_CTRL=m >>>>>>> >>>>>>> Are you sure this should be module? Shouldn't NFS boot be supported by >>>>>>> default? I might be wring here though. >>>>>> >>>>>> >>>>>> NFS root is supported already with this being module. Yes, it must be a >>>>>> module, cannot be built in. >>>>> It seems I am using it as built-in on MX95 Verdin (patch is posted on >>>>> the ML), and yes, I do boot from NFS root without any initrd/initramfs. >>>>> It has to be built-in for that use case to work. >>>> >>>> >>>> Every arm64 platform is supposed to use initramfs and we already use all >>>> over the place. >>> >>> Shouldn't the platform also be at least bootable with the defconfig ? If >>> yes, then initramfs is a mandatory requirement for a NFS root boot (not >>> a ... supposed to ... optional one), which does not seem to be the case >>> until now. >> >> It always was a requirement, nothing new here. > > Is this requirement documented anywhere then ? Dunno, just dozen of emails. > >>> I would argue the ethernet MAC support should be built-in to achieve >>> maximum utility with the defconfig. >> >> No, you missed my earlier point - all decent platforms already use >> initramfs since it is really not complicated. > > Is my understanding correct, that the in-kernel defconfig is not meant > for practical use and is meant mainly for build-testing/build-coverage ? It is 100% practical use - we all test our boards on defconfig. It is not build testing, but actual runtime usage and testing. And as mentioned many times - being able to only toggle KASAN for defconfig and still fit in boot partition size is pretty useful. Best regards, Krzysztof