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

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Message-ID:
 <TY3PR01MB1134608AEFD37B1730949C7C886DBA@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Mon, 1 Dec 2025 14:27:42 +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

Hi Josua Mayer,

> -----Original Message-----
> From: Josua Mayer <josua@...id-run.com>
> Sent: 01 December 2025 14:21
> Subject: Re: [PATCH v2 0/2] mmc: host: renesas_sdhi_core: support configuring an optional sdio mux
> 
> Am 01.12.25 um 14:17 schrieb Biju Das:
> >
> >> -----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??
> 
> The latter.
> 
> DIP switch decides bootloader starting from eMMC or SD.
> Then u-boot has complete freedom.
> 
> Finally U-Boot shall load (and patch) DTB for either eMMC or SD.
> Regardless of whether rootfs is initramfs or physical media.

OK, it is clear now.

Cheers,
Biju