[openwrt/openwrt] realtek: switch Netgear NGE devices to rt-loader

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/3e09991c079604b00640cded9f74e999d9b52d43

commit 3e09991c079604b00640cded9f74e999d9b52d43
Author: Jan Hoffmann <jan at 3e8.eu>
AuthorDate: Sat Aug 9 20:50:18 2025 +0200

    realtek: switch Netgear NGE devices to rt-loader
    
    The bootloader on these devices uses 0x81000000 as load address for the
    compressed image. Since the kernel uses a load address 0x80100000, this
    only leaves a space of 15 MiB for the uncompressed image. For larger
    images, the compressed data starts to get overwritten, and at some point
    the boot will fail:
    
        ## Booting image from partition ... 0
        ## Booting kernel from Legacy Image at 81000000 ...
           Version:      9.9.9.9
           Created:      2025-08-07  14:56:09 UTC
           Data Size:    6756645 Bytes = 6.4 MB
           Checksum ... OK
           Uncompressing ... LZMA: uncompress or overwrite error 1 - must RESET board to recover
    
    Currently, initramfs images with default config are already over the
    limit. And while they still happen to work regardless, adding additional
    packages easily pushes the size so much that the boot fails.
    
    Fix this by switching to rt-loader (which relocates the data to the
    upper end of the RAM before decompression). The switch includes regular
    kernel images to avoid this becoming an issue again in the future.
    
    Signed-off-by: Jan Hoffmann <jan at 3e8.eu>
    Link: https://github.com/openwrt/openwrt/pull/19734
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 target/linux/realtek/image/rtl838x.mk | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/target/linux/realtek/image/rtl838x.mk b/target/linux/realtek/image/rtl838x.mk
index cb9a0903fd..23fb19dba7 100644
--- a/target/linux/realtek/image/rtl838x.mk
+++ b/target/linux/realtek/image/rtl838x.mk
@@ -217,16 +217,7 @@ TARGET_DEVICES += linksys_lgs310c
 
 # "NGE" refers to the uImage magic
 define Device/netgear_nge
-  KERNEL := \
-	kernel-bin | \
-	append-dtb | \
-	lzma | \
-	uImage lzma
-  KERNEL_INITRAMFS := \
-	kernel-bin | \
-	append-dtb | \
-	lzma | \
-	uImage lzma
+  $(Device/uimage-rt-loader)
   SOC := rtl8380
   IMAGE_SIZE := 14848k
   UIMAGE_MAGIC := 0x4e474520