linux-kernel - RE: [PATCH v2 0/2] mmc: host: renesas_sdhi_core: support configuring an optional sdio mux

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Message-ID:
 <TY3PR01MB11346F6A9485A334E8BAAD0E586DBA@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Mon, 1 Dec 2025 13:17:26 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Josua Mayer <josua@...id-run.com>, Ulf Hansson <ulf.hansson@...aro.org>,
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Geert Uytterhoeven
	<geert+renesas@...der.be>, magnus.damm <magnus.damm@...il.com>, wsa+renesas
	<wsa+renesas@...g-engineering.com>
CC: Mikhail Anikin <mikhail.anikin@...id-run.com>, Yazan Shhady
	<yazan.shhady@...id-run.com>, Jon Nettleton <jon@...id-run.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH v2 0/2] mmc: host: renesas_sdhi_core: support configuring
 an optional sdio mux



> -----Original Message-----
> From: Josua Mayer <josua@...id-run.com>
> Sent: 01 December 2025 12:31
> Subject: [PATCH v2 0/2] mmc: host: renesas_sdhi_core: support configuring an optional sdio mux
> 
> Some Renesas SoC based boards mux SD and eMMC on a single sdio controller, exposing user control by
> dip switch and software control by gpio.
> 
> Purpose is to simplify development and provisioning by selecting boot media at power-on, and again
> before starting linux.

Does it mean, you boot with eSD mode, boot the linux with SD mode and flash the image to eMMC??

and then, switch to eMMC boot mode and boot everything from eMMC??


Or

boot with eSD mode, flash emmc images at initramfs level/u-boot level

and then, switch to eMMC boot mode and boot everything from eMMC??


Cheers,
Biju