From 138d3b64a111b52f2cfe42c3ef84283bd281fae4 Mon Sep 17 00:00:00 2001 From: Tim Gover Date: Fri, 16 Dec 2022 15:51:17 +0000 Subject: [PATCH] overlays: Add disable-emmc2 Add a new overlay that disables the EMMC2 controller on BCM2711. This can be useful on a Compute Module 4 if the onboard EMMC2 storage is unreliable and the system can be booted by other means e.g Network / USB. Signed-off-by: Tim Gover --- arch/arm/boot/dts/overlays/Makefile | 1 + arch/arm/boot/dts/overlays/README | 8 ++++++++ .../arm/boot/dts/overlays/disable-emmc2-overlay.dts | 13 +++++++++++++ arch/arm/boot/dts/overlays/overlay_map.dts | 4 ++++ 4 files changed, 26 insertions(+) create mode 100644 arch/arm/boot/dts/overlays/disable-emmc2-overlay.dts --- a/arch/arm/boot/dts/overlays/Makefile +++ b/arch/arm/boot/dts/overlays/Makefile @@ -49,6 +49,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \ dionaudio-loco.dtbo \ dionaudio-loco-v2.dtbo \ disable-bt.dtbo \ + disable-emmc2.dtbo \ disable-wifi.dtbo \ dpi18.dtbo \ dpi18cpadhi.dtbo \ --- a/arch/arm/boot/dts/overlays/README +++ b/arch/arm/boot/dts/overlays/README @@ -895,6 +895,14 @@ Load: dtoverlay=disable-bt Params: +Name: disable-emmc2 +Info: Disable EMMC2 controller on BCM2711. + The allows the onboard EMMC storage on Compute Module 4 to be disabled + e.g. if a fault has occurred. +Load: dtoverlay=disable-emmc2 +Params: + + Name: disable-wifi Info: Disable onboard WLAN on Pi 3B, 3B+, 3A+, 4B and Zero W. Load: dtoverlay=disable-wifi --- /dev/null +++ b/arch/arm/boot/dts/overlays/disable-emmc2-overlay.dts @@ -0,0 +1,13 @@ +/dts-v1/; +/plugin/; + +/{ + compatible = "brcm,bcm2711"; + + fragment@0 { + target = <&emmc2>; + __overlay__ { + status = "disabled"; + }; + }; +}; --- a/arch/arm/boot/dts/overlays/overlay_map.dts +++ b/arch/arm/boot/dts/overlays/overlay_map.dts @@ -9,6 +9,10 @@ bcm2711; }; + disable-emmc2 { + bcm2711; + }; + highperi { bcm2711; };