[PATCH] ramips: use on-flash partition table for Sercomm BZV/CHJ
Jan Hoffmann
jan at 3e8.eu
Fri Jan 27 15:01:18 PST 2023
These devices have a partition table stored in flash, which compensates
for any pre-existing bad blocks by enlarging the respective partition.
This means that the current static partition table is only correct for
devices without any bad blocks.
Typical results of this mismatch are degraded wireless performance and
wrong MAC addresses, when the factory partition is shifted due to a bad
block somewhere before it. If there is a bad block already before the
ubi partition, then OpenWrt may not run at all because the kernel can't
find the rootfs.
Use the on-flash partition table to fix these issues. Replace the two
reserved partitions by the full partition list, as the driver does not
allow merging them.
Signed-off-by: Jan Hoffmann <jan at 3e8.eu>
---
I only tested on a WAC124 without any bad blocks, but the kernel log
shows that the partition map parser is used.
This issue seems to be quite common, as it has appeared multiple times
in forum posts. Variants of this patch have been around, and users
trying them have reported that it actually works on devices with bad
blocks.
.../dts/mt7621_netgear_sercomm_bzv.dtsi | 169 +++++++++++++++++-
.../dts/mt7621_netgear_sercomm_chj.dtsi | 169 +++++++++++++++++-
2 files changed, 330 insertions(+), 8 deletions(-)
diff --git a/target/linux/ramips/dts/mt7621_netgear_sercomm_bzv.dtsi b/target/linux/ramips/dts/mt7621_netgear_sercomm_bzv.dtsi
index 9fa4af8fd666..ab96b8fdd121 100644
--- a/target/linux/ramips/dts/mt7621_netgear_sercomm_bzv.dtsi
+++ b/target/linux/ramips/dts/mt7621_netgear_sercomm_bzv.dtsi
@@ -223,47 +223,208 @@
status = "okay";
partitions {
- compatible = "fixed-partitions";
+ compatible = "sercomm,sc-partitions", "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
partition at 0 {
label = "u-boot";
reg = <0x0 0x100000>;
+ sercomm,scpart-id = <0>;
read-only;
};
partition at 100000 {
label = "SC PART_MAP";
reg = <0x100000 0x100000>;
+ sercomm,scpart-id = <1>;
read-only;
};
partition at 200000 {
label = "kernel";
reg = <0x200000 0x400000>;
+ sercomm,scpart-id = <2>;
};
partition at 600000 {
label = "ubi";
reg = <0x600000 0x2800000>;
+ sercomm,scpart-id = <3>;
};
partition at 2e00000 {
- label = "reserved0";
- reg = <0x2e00000 0x1800000>;
+ label = "English UI";
+ reg = <0x2e00000 0x200000>;
+ sercomm,scpart-id = <4>;
+ read-only;
+ };
+
+ partition at 3000000 {
+ label = "ML1";
+ reg = <0x3000000 0x200000>;
+ sercomm,scpart-id = <5>;
+ read-only;
+ };
+
+ partition at 3200000 {
+ label = "ML2";
+ reg = <0x3200000 0x200000>;
+ sercomm,scpart-id = <6>;
+ read-only;
+ };
+
+ partition at 3400000 {
+ label = "ML3";
+ reg = <0x3400000 0x200000>;
+ sercomm,scpart-id = <7>;
+ read-only;
+ };
+
+ partition at 3600000 {
+ label = "ML4";
+ reg = <0x3600000 0x200000>;
+ sercomm,scpart-id = <8>;
+ read-only;
+ };
+
+ partition at 3800000 {
+ label = "ML5";
+ reg = <0x3800000 0x200000>;
+ sercomm,scpart-id = <9>;
+ read-only;
+ };
+
+ partition at 3a00000 {
+ label = "ML6";
+ reg = <0x3a00000 0x200000>;
+ sercomm,scpart-id = <10>;
+ read-only;
+ };
+
+ partition at 3c00000 {
+ label = "ML7";
+ reg = <0x3c00000 0x200000>;
+ sercomm,scpart-id = <11>;
+ read-only;
+ };
+
+ partition at 3e00000 {
+ label = "ML8";
+ reg = <0x3e00000 0x200000>;
+ sercomm,scpart-id = <12>;
+ read-only;
+ };
+
+ partition at 4000000 {
+ label = "ML9";
+ reg = <0x4000000 0x200000>;
+ sercomm,scpart-id = <13>;
+ read-only;
+ };
+
+ partition at 4200000 {
+ label = "ML10";
+ reg = <0x4200000 0x200000>;
+ sercomm,scpart-id = <14>;
+ read-only;
+ };
+
+ partition at 4400000 {
+ label = "ML11";
+ reg = <0x4400000 0x200000>;
+ sercomm,scpart-id = <15>;
read-only;
};
factory: partition at 4600000 {
label = "factory";
reg = <0x4600000 0x200000>;
+ sercomm,scpart-id = <16>;
read-only;
};
partition at 4800000 {
+ label = "SC Private Data";
+ reg = <0x4800000 0x200000>;
+ sercomm,scpart-id = <17>;
+ read-only;
+ };
+
+ partition at 4a00000 {
+ label = "POT";
+ reg = <0x4a00000 0x200000>;
+ sercomm,scpart-id = <18>;
+ read-only;
+ };
+
+ partition at 4c00000 {
+ label = "Traffic Meter";
+ reg = <0x4c00000 0x200000>;
+ sercomm,scpart-id = <19>;
+ read-only;
+ };
+
+ partition at 4e00000 {
+ label = "SC PID";
+ reg = <0x4e00000 0x200000>;
+ sercomm,scpart-id = <20>;
+ read-only;
+ };
+
+ partition at 5000000 {
+ label = "SC Nvram";
+ reg = <0x5000000 0x200000>;
+ sercomm,scpart-id = <21>;
+ read-only;
+ };
+
+ partition at 5200000 {
+ label = "Ralink Nvram";
+ reg = <0x5200000 0x200000>;
+ sercomm,scpart-id = <22>;
+ read-only;
+ };
+
+ partition at 5400000 {
+ label = "reserved0";
+ reg = <0x5400000 0x200000>;
+ sercomm,scpart-id = <23>;
+ read-only;
+ };
+
+ partition at 5600000 {
label = "reserved1";
- reg = <0x4800000 0x3800000>;
+ reg = <0x5600000 0x200000>;
+ sercomm,scpart-id = <24>;
+ read-only;
+ };
+
+ partition at 5800000 {
+ label = "reserved2";
+ reg = <0x5800000 0x200000>;
+ sercomm,scpart-id = <25>;
+ read-only;
+ };
+
+ partition at 5a00000 {
+ label = "reserved3";
+ reg = <0x5a00000 0x200000>;
+ sercomm,scpart-id = <26>;
+ read-only;
+ };
+
+ partition at 5c00000 {
+ label = "reserved4";
+ reg = <0x5c00000 0x200000>;
+ sercomm,scpart-id = <27>;
+ read-only;
+ };
+
+ partition at 5e00000 {
+ label = "reserved5";
+ reg = <0x5e00000 0x2180000>;
+ sercomm,scpart-id = <28>;
read-only;
};
};
diff --git a/target/linux/ramips/dts/mt7621_netgear_sercomm_chj.dtsi b/target/linux/ramips/dts/mt7621_netgear_sercomm_chj.dtsi
index eaf12a891ef2..cd9582e54120 100644
--- a/target/linux/ramips/dts/mt7621_netgear_sercomm_chj.dtsi
+++ b/target/linux/ramips/dts/mt7621_netgear_sercomm_chj.dtsi
@@ -151,47 +151,208 @@
status = "okay";
partitions {
- compatible = "fixed-partitions";
+ compatible = "sercomm,sc-partitions", "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
partition at 0 {
label = "u-boot";
reg = <0x0 0x100000>;
+ sercomm,scpart-id = <0>;
read-only;
};
partition at 100000 {
label = "SC PART_MAP";
reg = <0x100000 0x100000>;
+ sercomm,scpart-id = <1>;
read-only;
};
partition at 200000 {
label = "kernel";
reg = <0x200000 0x400000>;
+ sercomm,scpart-id = <2>;
};
partition at 600000 {
label = "ubi";
reg = <0x600000 0x2800000>;
+ sercomm,scpart-id = <3>;
};
partition at 2e00000 {
- label = "reserved0";
- reg = <0x2e00000 0x1800000>;
+ label = "English UI";
+ reg = <0x2e00000 0x200000>;
+ sercomm,scpart-id = <4>;
+ read-only;
+ };
+
+ partition at 3000000 {
+ label = "ML1";
+ reg = <0x3000000 0x200000>;
+ sercomm,scpart-id = <5>;
+ read-only;
+ };
+
+ partition at 3200000 {
+ label = "ML2";
+ reg = <0x3200000 0x200000>;
+ sercomm,scpart-id = <6>;
+ read-only;
+ };
+
+ partition at 3400000 {
+ label = "ML3";
+ reg = <0x3400000 0x200000>;
+ sercomm,scpart-id = <7>;
+ read-only;
+ };
+
+ partition at 3600000 {
+ label = "ML4";
+ reg = <0x3600000 0x200000>;
+ sercomm,scpart-id = <8>;
+ read-only;
+ };
+
+ partition at 3800000 {
+ label = "ML5";
+ reg = <0x3800000 0x200000>;
+ sercomm,scpart-id = <9>;
+ read-only;
+ };
+
+ partition at 3a00000 {
+ label = "ML6";
+ reg = <0x3a00000 0x200000>;
+ sercomm,scpart-id = <10>;
+ read-only;
+ };
+
+ partition at 3c00000 {
+ label = "ML7";
+ reg = <0x3c00000 0x200000>;
+ sercomm,scpart-id = <11>;
+ read-only;
+ };
+
+ partition at 3e00000 {
+ label = "ML8";
+ reg = <0x3e00000 0x200000>;
+ sercomm,scpart-id = <12>;
+ read-only;
+ };
+
+ partition at 4000000 {
+ label = "ML9";
+ reg = <0x4000000 0x200000>;
+ sercomm,scpart-id = <13>;
+ read-only;
+ };
+
+ partition at 4200000 {
+ label = "ML10";
+ reg = <0x4200000 0x200000>;
+ sercomm,scpart-id = <14>;
+ read-only;
+ };
+
+ partition at 4400000 {
+ label = "ML11";
+ reg = <0x4400000 0x200000>;
+ sercomm,scpart-id = <15>;
read-only;
};
factory: partition at 4600000 {
label = "factory";
reg = <0x4600000 0x200000>;
+ sercomm,scpart-id = <16>;
read-only;
};
partition at 4800000 {
+ label = "SC Private Data";
+ reg = <0x4800000 0x200000>;
+ sercomm,scpart-id = <17>;
+ read-only;
+ };
+
+ partition at 4a00000 {
+ label = "POT";
+ reg = <0x4a00000 0x200000>;
+ sercomm,scpart-id = <18>;
+ read-only;
+ };
+
+ partition at 4c00000 {
+ label = "Traffic Meter";
+ reg = <0x4c00000 0x200000>;
+ sercomm,scpart-id = <19>;
+ read-only;
+ };
+
+ partition at 4e00000 {
+ label = "SC PID";
+ reg = <0x4e00000 0x200000>;
+ sercomm,scpart-id = <20>;
+ read-only;
+ };
+
+ partition at 5000000 {
+ label = "SC Nvram";
+ reg = <0x5000000 0x200000>;
+ sercomm,scpart-id = <21>;
+ read-only;
+ };
+
+ partition at 5200000 {
+ label = "Ralink Nvram";
+ reg = <0x5200000 0x200000>;
+ sercomm,scpart-id = <22>;
+ read-only;
+ };
+
+ partition at 5400000 {
+ label = "reserved0";
+ reg = <0x5400000 0x200000>;
+ sercomm,scpart-id = <23>;
+ read-only;
+ };
+
+ partition at 5600000 {
label = "reserved1";
- reg = <0x4800000 0x3800000>;
+ reg = <0x5600000 0x200000>;
+ sercomm,scpart-id = <24>;
+ read-only;
+ };
+
+ partition at 5800000 {
+ label = "reserved2";
+ reg = <0x5800000 0x200000>;
+ sercomm,scpart-id = <25>;
+ read-only;
+ };
+
+ partition at 5a00000 {
+ label = "reserved3";
+ reg = <0x5a00000 0x200000>;
+ sercomm,scpart-id = <26>;
+ read-only;
+ };
+
+ partition at 5c00000 {
+ label = "reserved4";
+ reg = <0x5c00000 0x200000>;
+ sercomm,scpart-id = <27>;
+ read-only;
+ };
+
+ partition at 5e00000 {
+ label = "reserved5";
+ reg = <0x5e00000 0x2180000>;
+ sercomm,scpart-id = <28>;
read-only;
};
};
--
2.39.1
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