gemini: sl93512r: override SL93512R partitions for firmware

This is patch is identical in form and purpose as the IB-4220-B
patch. We switch over to a single "firmware" partition.

All reference design-based machines are now converted and we can
drop the legacy set-up code.

It turns out that the reference design also uses the flash layout
with a 3072KB kernel so augment the sysupgrade to do the right
thing also here.

Link: https://github.com/openwrt/openwrt/pull/21820
(cherry picked from commit c579e1d04c35dc767964901b384d7bf42f672668)
Link: https://github.com/openwrt/openwrt/pull/21973
Signed-off-by: Linus Walleij <linusw@kernel.org>

3 files changed, 75 insertions, 60 deletions

diff --git a/target/linux/gemini/base-files/lib/upgrade/platform.sh b/target/linux/gemini/base-files/lib/upgrade/platform.sh
index 19a6488f31..1553bdd55a 100644
--- a/target/linux/gemini/base-files/lib/upgrade/platform.sh
+++ b/target/linux/gemini/base-files/lib/upgrade/platform.sh
@@ -56,24 +56,6 @@ gemini_check_redboot_parts() {
 	fi
 }
 
-gemini_do_redboot_upgrade() {
-	echo "Extract the three firmware parts from tarfile"
-	echo 3 > /proc/sys/vm/drop_caches
-	echo "COMMENCING UPGRADE. BE PATIENT, THIS IS NOT FAST!"
-	KFSZ=$(tar xfz "$1" zImage -O | wc -c)
-	echo "Upgrade Kern partition (kernel part 1, size ${KFSZ})"
-	tar xfz "$1" zImage -O | mtd write - Kern
-	[ $? -ne 0 ] && exit 1
-	RFSZ=$(tar xfz "$1" rd.gz -O | wc -c)
-	echo "Upgrade Ramdisk partition (kernel part 2, size ${RFSZ})"
-	tar xfz "$1" rd.gz -O | mtd write - Ramdisk
-	[ $? -ne 0 ] && exit 1
-	AFSZ=$(tar xfz "$1" hddapp.tgz -O | wc -c)
-	echo "Upgrade Application partition (rootfs, size ${AFSZ})"
-	tar xfz "$1" hddapp.tgz -O | mtd write - Application
-	[ $? -ne 0 ] && exit 1
-}
-
 # This converts the old RedBoot partitioning to the new shared
 # "firmware" partition.
 gemini_do_flat_redboot_upgrade() {
@@ -129,13 +111,12 @@ platform_do_upgrade() {
 		PART_NAME=firmware
 		default_do_upgrade "$1"
 		;;
-	raidsonic,ib-4220-b)
+	raidsonic,ib-4220-b|\
+	storlink,gemini324)
 		gemini_do_combined_upgrade "$1" 24 48 48
 		;;
-	itian,sq201|\
-	storlink,gemini324)
-		gemini_check_redboot_parts "$1" 16 48 48
-		gemini_do_redboot_upgrade "$1"
+	itian,sq201)
+		gemini_do_combined_upgrade "$1" 16 48 48
 		;;
 	esac
 }
diff --git a/target/linux/gemini/image/Makefile b/target/linux/gemini/image/Makefile
index 0e67207715..51191faad6 100644
--- a/target/linux/gemini/image/Makefile
+++ b/target/linux/gemini/image/Makefile
@@ -99,30 +99,6 @@ define CreateStorlinkProlog
 	$(call Image/pad-to,$(1),512)
 endef
 
-define CreateStorlinkTarfile
-	mkdir -p $@.tmp
-
-	# "Application" partition is the rootfs
-	mv $@ $@.tmp/hddapp.tgz
-	$(STAGING_DIR_HOST)/bin/padjffs2 $(IMAGE_ROOTFS) -c 128 >>$@.tmp/hddapp.tgz
-	$(call CreateStorlinkProlog,$@.tmp/zImage,$(2))
-	# Copy first part of the kernel into zImage
-	dd if=$(IMAGE_KERNEL) of=$@.tmp/zImage bs=1 seek=512 count=$(3)
-	$(call Image/pad-to,$@.tmp/zImage,128k)
-	# Put the rest of the kernel into the "ramdisk"
-	dd if=$(IMAGE_KERNEL) of=$@.tmp/rd.gz bs=1 skip=$(3) count=6144k conv=sync
-	$(call Image/pad-to,$@.tmp/rd.gz,128k)
-	cp ./ImageInfo-$(1) $@.tmp/ImageInfo
-
-	sed -i -e "s/DATESTR/`date +%Y%m%d $(if $(SOURCE_DATE_EPOCH),--date "@$(SOURCE_DATE_EPOCH)")`/g" $@.tmp/ImageInfo
-
-	(cd $@.tmp; tar --sort=name --owner=0 --group=0 --numeric-owner -czf $@ * \
-		$(if $(SOURCE_DATE_EPOCH),--mtime="@$(SOURCE_DATE_EPOCH)"))
-
-	rm -rf $@.tmp
-	exit 0
-endef
-
 define CreateStorlinkFactoryfile
 	mkdir -p $@.tmp
 	$(call CreateStorlinkProlog,$@.tmp/zImage,$(2))
@@ -162,10 +138,6 @@ define CreateStorlinkSysupgradefile
 endef
 
 # 2048k "Kern" partition
-define Build/storlink-2048k-default-image
-	$(call CreateStorlinkTarfile,$(1),2048k,2096640)
-endef
-
 define Build/storlink-2048k-factory-image
 	$(call CreateStorlinkFactoryfile,$(1),2048k,2096640)
 endef
@@ -256,15 +228,6 @@ define Device/storlink-reference
 	COMPILE/copy-kernel-$(1).bin := copy-kernel.bin
 	IMAGES := factory.bin sysupgrade.bin
 	FILESYSTEMS := squashfs
-	# Flash layout:
-	# Kern         512 bytes copy-kernel
-        #              2096640 bytes zImage
-	# Ramdisk      6144k remaining zImage
-	# Application  6144k
-	IMAGE/factory.bin := append-rootfs | pad-rootfs | pad-to 128k | \
-		storlink-2048k-default-image $(1)
-	IMAGE/sysupgrade.bin := append-rootfs | pad-rootfs | pad-to 128k | \
-		storlink-2048k-default-image $(1) | append-metadata
 	DEVICE_PACKAGES := $(GEMINI_NAS_PACKAGES)
 endef
 
@@ -300,6 +263,9 @@ define Device/storlink_sl93512r
 	DEVICE_VENDOR := StorLink
 	DEVICE_MODEL := SL93512r
 	DEVICE_DTS := gemini-sl93512r
+	IMAGE/factory.bin := storlink-3072k-factory-image $(1)
+	IMAGE/sysupgrade.bin := storlink-3072k-sysupgrade-image $(1) |\
+			append-metadata
 	DEVICE_PACKAGES += kmod-dsa-vsc73xx-spi
 endef
 TARGET_DEVICES += storlink_sl93512r
diff --git a/target/linux/gemini/patches-6.12/305-gemini-augment-SL93512R-DTS-with-botched-partitions.patch b/target/linux/gemini/patches-6.12/305-gemini-augment-SL93512R-DTS-with-botched-partitions.patch
new file mode 100644
index 0000000000..876cbf0a12
--- /dev/null
+++ b/target/linux/gemini/patches-6.12/305-gemini-augment-SL93512R-DTS-with-botched-partitions.patch
@@ -0,0 +1,68 @@
+From b5732601a7ff5457cb1e3a9389761aa23a81f54d Mon Sep 17 00:00:00 2001
+From: Linus Walleij <linusw@kernel.org>
+Date: Sun, 1 Feb 2026 10:20:56 +0100
+Subject: [PATCH] gemini: augment SL93512R DTS with botched partitions
+
+Same botched partitions as the Raidsonic IB-4220-B.
+
+Signed-off-by: Linus Walleij <linusw@kernel.org>
+---
+ arch/arm/boot/dts/gemini/gemini-sl93512r.dts | 39 ++++++++++++++++++--
+ 1 file changed, 35 insertions(+), 4 deletions(-)
+
+--- a/arch/arm/boot/dts/gemini/gemini-sl93512r.dts
++++ b/arch/arm/boot/dts/gemini/gemini-sl93512r.dts
+@@ -24,7 +24,7 @@
+ 	};
+ 
+ 	chosen {
+-		bootargs = "console=ttyS0,19200n8 root=/dev/mtdblock3 rw rootfstype=squashfs,jffs2 rootwait";
++		bootargs = "console=ttyS0,19200n8";
+ 		stdout-path = &uart0;
+ 	};
+ 
+@@ -143,10 +143,41 @@
+ 			/* 16MB of flash */
+ 			reg = <0x30000000 0x01000000>;
+ 
++			/*
++			 * Override the RedBoot partition table with fixed partitions
++			 * in order to create a coherent "firmware" partition so that
++			 * we can have optimal flash usage with OpenWrt in a big
++			 * MTD-splitted "firmware" partition.
++			 */
+ 			partitions {
+-				compatible = "redboot-fis";
+-				/* Eraseblock at 0xfe0000 */
+-				fis-index-block = <0x7f>;
++				compatible = "fixed-partitions";
++				#address-cells = <1>;
++				#size-cells = <1>;
++				partition@0 {
++					label = "BOOT";
++					reg = <0x00000000 0x00020000>;
++					read-only;
++				};
++				partition@1 {
++					compatible = "openwrt,executable-prolog";
++					label = "firmware";
++					reg = <0x00020000 0x00f00000>;
++				};
++				partition@2 {
++					label = "VCTL";
++					reg = <0x00f20000 0x00020000>;
++					read-only;
++				};
++				partition@3 {
++					label = "CurConf";
++					reg = <0x00f40000 0x000a0000>;
++					read-only;
++				};
++				partition@4 {
++					label = "FIS directory";
++					reg = <0x00fe0000 0x00020000>;
++					read-only;
++				};
+ 			};
+ 		};
+