sh: include empty zero page in zImage

From: Magnus Damm <[email protected]>

Include the empty zero page data in the zImage.
Without this patch the empty zero page may be
uninitialized.

Signed-off-by Magnus Damm <[email protected]>

---

I suppose we should have a fallback option to allow boot loaders passing data in the zero page. Or perhaps doing it the other way around is better.

 arch/sh/boot/compressed/Makefile |    2 --
 arch/sh/boot/compressed/misc.c   |    2 +-
 2 files changed, 1 insertion(+), 3 deletions(-)

arch/sh/boot/compressed/Makefile +0 -2

@@ -48,8 +48,6 @@ $(obj)/vmlinux.bin.bz2: $(vmlinux.bin.al
 $(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE
 	$(call if_changed,lzma)
 
-OBJCOPYFLAGS += -R .empty_zero_page
-
 LDFLAGS_piggy.o := -r --format binary --oformat $(ld-bfd) -T
 
 $(obj)/piggy.o: $(obj)/vmlinux.scr $(obj)/vmlinux.bin.$(suffix-y) FORCE

arch/sh/boot/compressed/misc.c +1 -2

@@ -131,7 +131,7 @@ void decompress_kernel(void)
 #ifdef CONFIG_SUPERH64
 	output_addr = (CONFIG_MEMORY_START + 0x2000);
 #else
-	output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
+	output_addr = __pa((unsigned long)&_text);
 #ifdef CONFIG_29BIT
 	output_addr |= P2SEG;
 #endif
--

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If you do this won't you overwrite any parameters from the boot loader?

Hi Stuart,

Quoted 1 line · Stuart MENEFY

If you do this won't you overwrite any parameters from the boot loader?

True, so we probably want to do this in a different way.

I don't want to break anything of course, but I'm not sure if u-boot supports passing parameters to zImages. It's not a u-boot centric world though.

I remember adding command line passing code to kexec-tools for either vmlinux or zImage, but I doubt that both image types are properly supported in kexec today.

Any ideas? How are things for ST? I need to fix up romImage somehow at least. Maybe zImage should be left alone as-is and work should be put into fixing the boot loaders.