sbl b16: banner blx redirected to print stublet 0x8062150

2026-09-11 06:40:20 +00:00
parent 537e2b6b2a
commit afc151ce0c
3 changed files with 66 additions and 0 deletions
@@ -0,0 +1,18 @@
+    .syntax unified
+    .cpu cortex-a7
+    .thumb
+    @ Banner stub for SBL1 logger call at 0x802f690 (blx r3 patched to bl here).
+    @ r0 = string. Print raw bytes via UARTDM until NUL (cap 256), return 0.
+    .text
+    .global banner_stub
+banner_stub:
+    movw r3, #0xf000
+    movt r3, #0x78a
+bn_loop:
+    ldrb r1, [r0], #1
+    cbz r1, bn_done
+    str r1, [r3, #0x70]
+    b bn_loop
+bn_done:
+    movs r0, #0
+    bx lr