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76 lines
2.0 KiB
Diff
76 lines
2.0 KiB
Diff
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From 138d3b64a111b52f2cfe42c3ef84283bd281fae4 Mon Sep 17 00:00:00 2001
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From: Tim Gover <tim.gover@raspberrypi.com>
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Date: Fri, 16 Dec 2022 15:51:17 +0000
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Subject: [PATCH] overlays: Add disable-emmc2
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Add a new overlay that disables the EMMC2 controller on BCM2711.
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This can be useful on a Compute Module 4 if the onboard EMMC2
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storage is unreliable and the system can be booted by other
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means e.g Network / USB.
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Signed-off-by: Tim Gover <tim.gover@raspberrypi.com>
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 8 ++++++++
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.../arm/boot/dts/overlays/disable-emmc2-overlay.dts | 13 +++++++++++++
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arch/arm/boot/dts/overlays/overlay_map.dts | 4 ++++
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4 files changed, 26 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/disable-emmc2-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -49,6 +49,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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dionaudio-loco.dtbo \
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dionaudio-loco-v2.dtbo \
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disable-bt.dtbo \
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+ disable-emmc2.dtbo \
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disable-wifi.dtbo \
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dpi18.dtbo \
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dpi18cpadhi.dtbo \
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -895,6 +895,14 @@ Load: dtoverlay=disable-bt
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Params: <None>
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+Name: disable-emmc2
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+Info: Disable EMMC2 controller on BCM2711.
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+ The allows the onboard EMMC storage on Compute Module 4 to be disabled
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+ e.g. if a fault has occurred.
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+Load: dtoverlay=disable-emmc2
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+Params: <None>
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+
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+
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Name: disable-wifi
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Info: Disable onboard WLAN on Pi 3B, 3B+, 3A+, 4B and Zero W.
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Load: dtoverlay=disable-wifi
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/disable-emmc2-overlay.dts
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@@ -0,0 +1,13 @@
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+/dts-v1/;
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+/plugin/;
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+
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+/{
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+ compatible = "brcm,bcm2711";
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+
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+ fragment@0 {
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+ target = <&emmc2>;
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+ __overlay__ {
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+ status = "disabled";
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+ };
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+ };
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+};
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--- a/arch/arm/boot/dts/overlays/overlay_map.dts
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+++ b/arch/arm/boot/dts/overlays/overlay_map.dts
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@@ -9,6 +9,10 @@
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bcm2711;
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};
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+ disable-emmc2 {
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+ bcm2711;
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+ };
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+
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highperi {
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bcm2711;
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};
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