linux-kernel - Re: [PATCH v2 4/4] ARM: configs: stm32: Remove useless flags in STM32 defconfig

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Message-ID: <11c927b6-ebf8-4c02-9fdf-86303144b4aa@foss.st.com>
Date: Mon, 6 Jan 2025 14:52:06 +0100
From: Patrice CHOTARD <patrice.chotard@...s.st.com>
To: Arnd Bergmann <arnd@...db.de>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Russell King <linux@...linux.org.uk>,
        Maxime
 Coquelin <mcoquelin.stm32@...il.com>,
        Petr Mladek <pmladek@...e.com>, Yoann
 Congal <yoann.congal@...le.fr>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>, <soc@...nel.org>
Subject: Re: [PATCH v2 4/4] ARM: configs: stm32: Remove useless flags in STM32
 defconfig



On 12/20/24 18:06, Arnd Bergmann wrote:
> On Fri, Dec 20, 2024, at 13:55, patrice.chotard@...s.st.com wrote:
>> From: Patrice Chotard <patrice.chotard@...s.st.com>
>>
>> As stm32_defconfig is dedicated to STM32 MCUs, disable
>> CONFIG_COMMON_CLK_STM32MP flag which is only used by STM32 MPUs.
>>
>> Disable CONFIG_SUSPEND, CONFIG_ADVISE_SYSCALLS, CONFIG_IO_URING
>> CONFIG_POSIX_TIMERS, CONFIG_GCC_PLUGINS, it will reduce the kernel
>> image size for these platforms which embed a low amount of memory.
>>
>> Tested on STM32F746-DISCO board which embeds 8MB of memory.
> 
> Out of curiosity, what is the smallest memory configuration that
> you see people using on stm32f7/h7 these days? I know we had
> configs that kind-of worked on 2MB in the past, but I assume there
> has been a lot of bloat since.
> 
>        Arnd

Hi Arnd

Currently, i have no idea about what is the smallest memory configuration on stm32f4/f7/h7
used by people using these SoCs. As you said, kernel Linux size is increasing version after version.

My goal was just to ensure that official ST boards are still booting a kernel Linux.

Patrice