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Initramfs unpacking failed: invalid magic at start of compressed archive
No filesystem could mount root, tried:

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

--- linux-6.6/arch/sparc/Makefile.vanilla	2023-12-18 12:27:25.366850564 +0100
+++ linux-6.6/arch/sparc/Makefile	2023-12-18 12:29:14.298845914 +0100
@@ -40,7 +40,7 @@
 #
 
 CHECKFLAGS    += -D__sparc__ -D__sparc_v9__ -D__arch64__
-KBUILD_LDFLAGS := -m elf64_sparc
+KBUILD_LDFLAGS := -m elf64_sparc -z max-page-size=0x100000
 export BITS   := 64
 UTS_MACHINE   := sparc64