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

[Biju Das]

Hi Josua Mayer,

> -----Original Message-----
> From: Josua Mayer <josua@xxxxxxxxxxxxx>
> 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@xxxxxxxxxxxxx>
> >> 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