linux-kernel - Re: [PATCHv2 13/23] ARM: dts: socfpga: add Enclustra boot-mode dtsi

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Message-ID: <CAFXKEHbefgGSa2LQsFR887N9y-OJnw8M1qT0vzA7kEwdkRDXOw@mail.gmail.com>
Date: Thu, 24 Oct 2024 08:15:54 +0200
From: Lothar Rubusch <l.rubusch@...il.com>
To: Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, 
	dinguyen@...nel.org, marex@...x.de, s.trumtrar@...gutronix.de, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCHv2 13/23] ARM: dts: socfpga: add Enclustra boot-mode dtsi

On Wed, Oct 23, 2024 at 7:20 PM Ahmad Fatoum <a.fatoum@...gutronix.de> wrote:
>
> Hello Lothar,
>
> On 20.10.24 21:40, Lothar Rubusch wrote:
> > Add generic boot-mode support to Enclustra Arria10 and Cyclone5 boards.
> > Some Enclustra carrier boards need hardware adjustments specific to the
> > selected boot-mode.
>
> Can you elaborate more on these hardware adjustments?
>
> Do the different boot media e.g. share pins and can't be active at the same
> time?

Exactly. Example, for booting from emmc, qspi needs to be turned off.
For reaching SD card or eMMC the boot mode pins need to be mux'd
accordingly. That's also why for e.g. flashing QSPI from off u-boot
Enclustra implemented a GPIO based boot mode switch. Same for
switching the MMCs.