script fixes

coreboot-t440p/steps/backup_bios.sh

@@ -1,5 +1,36 @@
 #!/bin/sh
-# Step: Verify BIOS backup integrity
+# Step: Verify BIOS backup integrity (with per-chip retry)
+
+# Re-read a single chip until two reads match or user gives up
+_reread_chip() {
+  _label="$1"   # "4mb" or "8mb"
+  _desc="$2"    # human-readable description
+
+  while true; do
+    warn "$_desc reads do NOT match. The chip may not be reading reliably."
+    echo ""
+    echo "  1) Re-seat programmer on $_desc chip and retry"
+    echo "  2) Abort"
+    echo ""
+    printf "${CYAN}Choice [1-2]:${NC} "
+    read -r _choice
+    case "$_choice" in
+      1)
+        info "Re-reading $_desc chip (read 1 of 2)..."
+        run_cmd "sudo flashrom --programmer ch341a_spi -r ${_label}_backup1.bin" || return 1
+        info "Re-reading $_desc chip (read 2 of 2)..."
+        run_cmd "sudo flashrom --programmer ch341a_spi -r ${_label}_backup2.bin" || return 1
+        if diff "${_label}_backup1.bin" "${_label}_backup2.bin" >/dev/null 2>&1; then
+          success "$_desc reads now match."
+          return 0
+        fi
+        ;;
+      *)
+        return 1
+        ;;
+    esac
+  done
+}
 
 step_backup_bios() {
   section "Verify BIOS Backups"
@@ -10,18 +41,14 @@ step_backup_bios() {
   if diff 4mb_backup1.bin 4mb_backup2.bin >/dev/null 2>&1; then
     success "4MB chip reads are identical."
   else
-    error "4MB chip reads do NOT match!"
-    warn "The chip may not be reading reliably. Re-seat the programmer and try again."
-    return 1
+    _reread_chip "4mb" "4MB (top)" || return 1
   fi
 
   info "Verifying 8MB chip reads match..."
   if diff 8mb_backup1.bin 8mb_backup2.bin >/dev/null 2>&1; then
     success "8MB chip reads are identical."
   else
-    error "8MB chip reads do NOT match!"
-    warn "The chip may not be reading reliably. Re-seat the programmer and try again."
-    return 1
+    _reread_chip "8mb" "8MB (bottom)" || return 1
   fi
 
   # Validate file sizes