linux-kernel - [PATCH] ARM: dts: BCM5301X: Linksys EA9500 add fixed partitions

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Message-Id: <20201026131351.258296-1-npcomplete13@gmail.com>
Date:   Mon, 26 Oct 2020 09:13:51 -0400
From:   Vivek Unune <npcomplete13@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Vivek Unune <npcomplete13@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Rafał Miłecki <zajec5@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: dts: BCM5301X: Linksys EA9500 add fixed partitions

This router has dual paritions to store trx firmware image and
dual partitions for nvram. The second one in each of these cases acts
as a backup store.

When tested with OpenWrt, the default partition parser causes two issues:

1. It labels both nvram partitions as nvram. In factory, second one is
labeled devinfo.
2. It parses second trx image and tries to create second 'linux' partition
and fails with - cannot create duplicate 'linux' partition. I've set this
partition to read-only for now

The following patch works around both of these issues.

Signed-off-by: Vivek Unune <npcomplete13@...il.com>
---
 .../boot/dts/bcm47094-linksys-panamera.dts    | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/arch/arm/boot/dts/bcm47094-linksys-panamera.dts b/arch/arm/boot/dts/bcm47094-linksys-panamera.dts
index 5d5930edfb9d..13da16c5de68 100644
--- a/arch/arm/boot/dts/bcm47094-linksys-panamera.dts
+++ b/arch/arm/boot/dts/bcm47094-linksys-panamera.dts
@@ -292,3 +292,44 @@ fixed-link {
 &usb3_phy {
 	status = "okay";
 };
+
+&nandcs {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "boot";
+			reg = <0x0000000 0x0080000>;
+			read-only;
+		};
+
+		partition@...00 {
+			label = "nvram";
+			reg = <0x080000 0x0100000>;
+		};
+
+		partition@...000{
+			label = "devinfo";
+			reg = <0x0180000 0x080000>;
+		};
+
+		partition@...000 {
+			label = "firmware";
+			reg = <0x0200000 0x01D00000>;
+			compatible = "brcm,trx";
+		};
+
+		partition@...0000 {
+			label = "failsafe";
+			reg = <0x01F00000 0x01D00000>;
+			read-only;
+		};
+
+		partition@...200000 {
+			label = "brcmnand";
+			reg = <0x05200000 0x02E00000>;
+		};
+	};
+};
-- 
2.25.1