linux-kernel - Re: [PATCH v1] arm64: defconfig: Enable i.MX95 configs for booting and Ethernet

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Message-ID: <f1bc82c0-8800-42e5-8a4d-aea209acd0f2@linaro.org>
Date: Thu, 23 Oct 2025 18:01:17 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Marek Vasut <marek.vasut@...lbox.org>,
 Alexander Stein <alexander.stein@...tq-group.com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Shawn Guo <shawnguo@...nel.org>, Fabio Estevam <festevam@...il.com>,
 Peng Fan <peng.fan@....com>, linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
 João Paulo Gonçalves <joao.goncalves@...adex.com>,
 João Paulo Gonçalves <jpaulo.silvagoncalves@...il.com>
Subject: Re: [PATCH v1] arm64: defconfig: Enable i.MX95 configs for booting
 and Ethernet

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 <joao.goncalves@...adex.com>
>>>>>>
>>>>>> 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 <joao.goncalves@...adex.com>
>>>>>> ---
>>>>>>    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.

> 
> 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.


Best regards,
Krzysztof