61 lines
1.7 KiB
Diff
61 lines
1.7 KiB
Diff
From b3a070cf6fe04129d2c174e45c14b98a759e0402 Mon Sep 17 00:00:00 2001
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Date: Fri, 11 Dec 2020 12:22:01 +0100
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Subject: [PATCH] ARM: dts: bcm2711: Add reserved memory template to
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hold firmware configuration
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RPi4's co-processor will copy the board's bootloader[1] configuration
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into memory for the OS to consume. Specifically, for the bootloader
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configuration and upgrade user-space routines to query it through
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nvmem's sysfs interface.
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Introduce a reserved-memory area template for the co-processor to edit
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before booting the system so as for Linux not to overwrite that memory
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and to expose it as an nvmem device.
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Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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[1] https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md
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---
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Changes since v1:
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- Introduce compatible string
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- Change alias name to something more explicit
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---
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arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
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+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
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@@ -24,6 +24,7 @@
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emmc2bus = &emmc2bus;
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ethernet0 = &genet;
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pcie0 = &pcie0;
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+ blconfig = &blconfig;
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};
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leds {
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@@ -215,6 +216,22 @@
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status = "okay";
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};
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+&rmem {
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+ /*
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+ * RPi4's co-processor will copy the board's bootloader configuration
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+ * into memory for the OS to consume. It'll also update this node with
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+ * its placement information.
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+ */
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+ blconfig: nvram@0 {
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+ compatible = "raspberrypi,bootloader-config", "nvmem-rmem";
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+ #address-cells = <1>;
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+ #size-cells = <1>;
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+ reg = <0x0 0x0 0x0>;
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+ no-map;
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+ status = "disabled";
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+ };
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+};
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+
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/* SDHCI is used to control the SDIO for wireless */
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&sdhci {
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#address-cells = <1>;
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