diff mbox series

[DO,NOT,MERGE,v8,01/36] sh: passing FDT address to kernel startup.

Message ID f77649c921180a3b8c3c3a29058ab782b499a3bd.1716965617.git.ysato@users.sourceforge.jp (mailing list archive)
State Awaiting Upstream
Delegated to: Geert Uytterhoeven
Headers show
Series Device Tree support for SH7751 based board | expand

Commit Message

Yoshinori Sato May 29, 2024, 8 a.m. UTC 
R4 is caller saved in SH ABI.
Save it so it doesn't get corrupted until it's needed for initialization.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 arch/sh/boot/compressed/head_32.S | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/sh/boot/compressed/head_32.S b/arch/sh/boot/compressed/head_32.S
index 7bb168133dbb..6be59851122e 100644
--- a/arch/sh/boot/compressed/head_32.S
+++ b/arch/sh/boot/compressed/head_32.S
@@ -15,7 +15,8 @@  startup:
 	/* Load initial status register */
 	mov.l   init_sr, r1
 	ldc     r1, sr
-
+	/* Save FDT address */
+	mov	r4, r13
 	/* Move myself to proper location if necessary */
 	mova	1f, r0
 	mov.l	1f, r2
@@ -84,7 +85,7 @@  l1:
 	/* Jump to the start of the decompressed kernel */
 	mov.l	kernel_start_addr, r0
 	jmp	@r0
-	nop
+	 mov	r13, r4
 	
 	.align	2
 bss_start_addr: