pussuw commented on code in PR #15901:
URL: https://github.com/apache/nuttx/pull/15901#discussion_r1969846485


##########
arch/arm64/src/common/arm64_head.S:
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@@ -365,15 +365,16 @@ out:
  */
 
 boot_stage_puts:
-    stp   xzr, x30, [sp, #-16]!
+    stp   x9, x30, [sp, #-16]!

Review Comment:
   You need to use a callee-saved register to ensure it does not get clobbered. 
x19-x28 are available.



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