From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: "Russell King (Oracle)" <linux@armlinux.org.uk>
Cc: Alexander Stein <alexander.stein@ew.tq-group.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>,
Shawn Guo <shawnguo@kernel.org>, Li Yang <leoyang.li@nxp.com>,
Marek Vasut <marex@denx.de>,
Marcel Ziswiler <marcel.ziswiler@toradex.com>,
soc@kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 8/9] ARM: multi_v7_defconfig: Add options to support TQMLS102xA series
Date: Sat, 21 Jan 2023 21:27:52 +0100 [thread overview]
Message-ID: <3114bdeb-c8eb-3a3a-0d68-ca3370ce64ec@linaro.org> (raw)
In-Reply-To: <Y8qr8wl8WdJfQ9We@shell.armlinux.org.uk>
On 20/01/2023 15:57, Russell King (Oracle) wrote:
> On Fri, Jan 20, 2023 at 12:35:41PM +0100, Krzysztof Kozlowski wrote:
>> Defconfig=y is only for critical stuff needed to bring initramfs. Time
>> is not needed for initramfs.
>
> Are I2C drivers "critical stuff"? What about AHCI drivers? What about
> all the USB HCI drivers? USB Storage can certainly be loaded from an
> initramfs, yet it's =y. LED triggers? Loads of RTC drivers that are
> marked as =y? XOR drivers? VIRTIO drivers? Filesystems? I seem to
> remember Red Hat sets even popular filesystems to be a module in their
> kernel.
Almost all your answers above - these should be =m. USB not always,
because it is used for USB Ethernet adapters which is used for network
boot (although even then initramfs comes with actual drivers...)
>
> Clearly, "defconfig=y is only for critical stuff" is rather false in
> practice, and I suspect is little more than a desire rather than a
> rule. I suspect it's more "defconfig=y is for stuff that makes most
> platforms successfully boot without an initramfs".
Yes, that's true, although there was already pushback against this.
Having an initramfs is not a big deal and nowadays I think all new ARMv8
platforms use it.
Anyway this talk here is about RTC which is not needed at all as built in.
Best regards,
Krzysztof
WARNING: multiple messages have this Message-ID (diff)
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: "Russell King (Oracle)" <linux@armlinux.org.uk>
Cc: Alexander Stein <alexander.stein@ew.tq-group.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>,
Shawn Guo <shawnguo@kernel.org>, Li Yang <leoyang.li@nxp.com>,
Marek Vasut <marex@denx.de>,
Marcel Ziswiler <marcel.ziswiler@toradex.com>,
soc@kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 8/9] ARM: multi_v7_defconfig: Add options to support TQMLS102xA series
Date: Sat, 21 Jan 2023 21:27:52 +0100 [thread overview]
Message-ID: <3114bdeb-c8eb-3a3a-0d68-ca3370ce64ec@linaro.org> (raw)
In-Reply-To: <Y8qr8wl8WdJfQ9We@shell.armlinux.org.uk>
On 20/01/2023 15:57, Russell King (Oracle) wrote:
> On Fri, Jan 20, 2023 at 12:35:41PM +0100, Krzysztof Kozlowski wrote:
>> Defconfig=y is only for critical stuff needed to bring initramfs. Time
>> is not needed for initramfs.
>
> Are I2C drivers "critical stuff"? What about AHCI drivers? What about
> all the USB HCI drivers? USB Storage can certainly be loaded from an
> initramfs, yet it's =y. LED triggers? Loads of RTC drivers that are
> marked as =y? XOR drivers? VIRTIO drivers? Filesystems? I seem to
> remember Red Hat sets even popular filesystems to be a module in their
> kernel.
Almost all your answers above - these should be =m. USB not always,
because it is used for USB Ethernet adapters which is used for network
boot (although even then initramfs comes with actual drivers...)
>
> Clearly, "defconfig=y is only for critical stuff" is rather false in
> practice, and I suspect is little more than a desire rather than a
> rule. I suspect it's more "defconfig=y is for stuff that makes most
> platforms successfully boot without an initramfs".
Yes, that's true, although there was already pushback against this.
Having an initramfs is not a big deal and nowadays I think all new ARMv8
platforms use it.
Anyway this talk here is about RTC which is not needed at all as built in.
Best regards,
Krzysztof
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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-01-21 20:27 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-19 14:42 [PATCH 0/9] TQMLS1021A support Alexander Stein
2023-01-19 14:42 ` Alexander Stein
2023-01-19 14:42 ` [PATCH 1/9] dt-bindings: arm: fsl: add TQ-Systems LS1021A board Alexander Stein
2023-01-19 14:42 ` Alexander Stein
2023-01-19 16:59 ` Krzysztof Kozlowski
2023-01-19 16:59 ` Krzysztof Kozlowski
2023-01-20 8:58 ` Alexander Stein
2023-01-20 8:58 ` Alexander Stein
2023-01-20 9:07 ` Krzysztof Kozlowski
2023-01-20 9:07 ` Krzysztof Kozlowski
2023-01-19 14:42 ` [PATCH 2/9] ARM: dts: ls1021a: add TQ-Systems MBLS102xA device tree Alexander Stein
2023-01-19 14:42 ` Alexander Stein
2023-01-19 17:03 ` Krzysztof Kozlowski
2023-01-19 17:03 ` Krzysztof Kozlowski
2023-01-20 10:08 ` Alexander Stein
2023-01-20 10:08 ` Alexander Stein
2023-01-20 10:21 ` Krzysztof Kozlowski
2023-01-20 10:21 ` Krzysztof Kozlowski
2023-01-19 14:42 ` [PATCH 3/9] ARM: dts: ls1021a: add TQMLS1021A flash partition layout Alexander Stein
2023-01-19 14:42 ` Alexander Stein
2023-01-19 14:42 ` [PATCH 4/9] ARM: dts: ls1021a: add TQMLS1021A/MBLS102xA LVDS TM070JVHG33 overlay Alexander Stein
2023-01-19 14:42 ` Alexander Stein
2023-01-19 14:42 ` [PATCH 5/9] ARM: dts: ls1021a: add TQMLS1021A/MBLS102xA HDMI overlay Alexander Stein
2023-01-19 14:42 ` Alexander Stein
2023-01-19 14:42 ` [PATCH 6/9] ARM: dts: ls1021a: add TQMLS1021A/MBLS102xA LVDS CDTECH DC44 overlay Alexander Stein
2023-01-19 14:42 ` Alexander Stein
2023-01-19 14:42 ` [PATCH 7/9] ARM: dts: ls1021a: add TQMLS1021A/MBLS102xA LVDS CDTECH FC21 overlay Alexander Stein
2023-01-19 14:42 ` Alexander Stein
2023-01-19 14:42 ` [PATCH 8/9] ARM: multi_v7_defconfig: Add options to support TQMLS102xA series Alexander Stein
2023-01-19 14:42 ` Alexander Stein
2023-01-19 17:04 ` Krzysztof Kozlowski
2023-01-19 17:04 ` Krzysztof Kozlowski
2023-01-20 11:12 ` Alexander Stein
2023-01-20 11:12 ` Alexander Stein
2023-01-20 11:35 ` Krzysztof Kozlowski
2023-01-20 11:35 ` Krzysztof Kozlowski
2023-01-20 14:57 ` Russell King (Oracle)
2023-01-20 14:57 ` Russell King (Oracle)
2023-01-21 20:27 ` Krzysztof Kozlowski [this message]
2023-01-21 20:27 ` Krzysztof Kozlowski
2023-01-21 22:33 ` Russell King (Oracle)
2023-01-21 22:33 ` Russell King (Oracle)
2023-01-19 14:42 ` [PATCH 9/9] [DNI] ARM: multi_v7_defconfig: Enable CONFIG_ARM_LPAE for multi_v7_config Alexander Stein
2023-01-19 14:42 ` Alexander Stein
2023-01-19 15:09 ` Arnd Bergmann
2023-01-19 15:09 ` Arnd Bergmann
2023-01-19 15:27 ` Alexander Stein
2023-01-19 15:27 ` Alexander Stein
2023-01-19 16:07 ` Arnd Bergmann
2023-01-19 16:07 ` Arnd Bergmann
2023-01-20 12:43 ` Alexander Stein
2023-01-20 12:43 ` Alexander Stein
2023-01-20 14:00 ` Arnd Bergmann
2023-01-20 14:00 ` Arnd Bergmann
2023-01-24 10:30 ` Alexander Stein
2023-01-24 10:30 ` Alexander Stein
2023-01-24 11:37 ` Arnd Bergmann
2023-01-24 11:37 ` Arnd Bergmann
2023-01-19 16:00 ` Russell King (Oracle)
2023-01-19 16:00 ` Russell King (Oracle)
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