Add support for multiple winbond chip versions

coreboot-t440p/steps/extract_bios.sh

@@ -4,16 +4,93 @@
 # Order rationale: read 4MB (top) chip first — smaller, faster,
 # surfaces setup issues (clip alignment, voltage, ribbon) sooner.
 
+# Probe the currently-clipped chip and resolve the flashrom chip name.
+#   $1 = variable name to populate (e.g. "CHIP_4MB")
+# Handles the "Multiple flash chip definitions match" case by prompting.
+_resolve_chip() {
+  _var="$1"
+
+  eval _cur=\"\$$_var\"
+  if [ -n "$_cur" ]; then
+    info "Using previously-selected chip for this size: $_cur"
+    return 0
+  fi
+
+  _log=$(mktemp)
+  printf "  ${DIM}\$ sudo flashrom --programmer ch341a_spi${NC}\n"
+  sudo flashrom --programmer ch341a_spi >"$_log" 2>&1
+  _st=$?
+
+  # Unambiguous success: one "Found ... chip \"NAME\"" line, exit 0.
+  if [ $_st -eq 0 ]; then
+    _chip=$(sed -nE 's/.*Found .* flash chip "([^"]+)".*/\1/p' "$_log" | head -1)
+    if [ -n "$_chip" ]; then
+      eval "$_var=\"\$_chip\""
+      info "Detected chip: $_chip"
+      rm -f "$_log"
+      return 0
+    fi
+  fi
+
+  # Ambiguous match: flashrom lists candidates but refuses to pick.
+  if grep -q "Multiple flash chip definitions match" "$_log"; then
+    _candidates=$(sed -nE 's/.*Found .* flash chip "([^"]+)".*/\1/p' "$_log")
+    _count=$(printf '%s\n' "$_candidates" | wc -l | tr -d ' ')
+    echo ""
+    warn "Flashrom read the chip but multiple variants match the same silicon ID."
+    info "This is normal for Winbond W25Q* parts. Pick one (the newest is safe):"
+    echo ""
+    _i=1
+    for _c in $_candidates; do
+      if [ "$_i" = "$_count" ]; then
+        echo "  $_i) $_c   ${DIM}(default — newest)${NC}"
+      else
+        echo "  $_i) $_c"
+      fi
+      _i=$((_i+1))
+    done
+    echo ""
+
+    _picked=""
+    while [ -z "$_picked" ]; do
+      printf "${CYAN}Choice [1-%s] (Enter = %s):${NC} " "$_count" "$_count"
+      read -r _sel
+      [ -z "$_sel" ] && _sel="$_count"
+      case "$_sel" in
+        ''|*[!0-9]*) echo "Enter a number."; continue ;;
+      esac
+      if [ "$_sel" -lt 1 ] || [ "$_sel" -gt "$_count" ]; then
+        echo "Out of range."
+        continue
+      fi
+      _picked=$(printf '%s\n' "$_candidates" | sed -n "${_sel}p")
+    done
+    eval "$_var=\"\$_picked\""
+    info "Using chip definition: $_picked"
+    rm -f "$_log"
+    return 0
+  fi
+
+  # Real failure (no chip, clip bad, etc.) — show the log and fail.
+  echo ""
+  error "Chip probe failed. flashrom output:"
+  sed 's/^/    /' "$_log"
+  rm -f "$_log"
+  return 1
+}
+
 # Read a chip with inline retry on failure.
 #   $1 = output filename
-#   $2 = human label (e.g. "4MB (top) — read 1 of 2")
+#   $2 = human label
+#   $3 = chip name (from _resolve_chip)
 _read_with_retry() {
   _out="$1"
   _label="$2"
+  _chip="$3"
 
   while true; do
     info "Reading $_label ..."
-    if run_cmd "sudo flashrom --programmer ch341a_spi -r $_out"; then
+    if run_cmd "sudo flashrom --programmer ch341a_spi -c \"$_chip\" -r $_out"; then
       return 0
     fi
 
@@ -56,9 +133,10 @@ step_extract_bios() {
   info "Align the red ribbon wire with the dot/notch on the chip (pin 1)."
   prompt_continue
 
-  _read_with_retry "4mb_backup1.bin" "4MB chip (read 1 of 2)" || return 1
-  _read_with_retry "4mb_backup2.bin" "4MB chip (read 2 of 2)" || return 1
-  success "4MB chip reads complete."
+  _resolve_chip CHIP_4MB || return 1
+  _read_with_retry "4mb_backup1.bin" "4MB chip (read 1 of 2)" "$CHIP_4MB" || return 1
+  _read_with_retry "4mb_backup2.bin" "4MB chip (read 2 of 2)" "$CHIP_4MB" || return 1
+  success "4MB chip reads complete ($CHIP_4MB)."
 
   # --- 8MB chip ---
   echo ""
@@ -68,7 +146,8 @@ step_extract_bios() {
   info "Re-check pin 1 alignment before pressing down."
   prompt_continue
 
-  _read_with_retry "8mb_backup1.bin" "8MB chip (read 1 of 2)" || return 1
-  _read_with_retry "8mb_backup2.bin" "8MB chip (read 2 of 2)" || return 1
-  success "8MB chip reads complete."
+  _resolve_chip CHIP_8MB || return 1
+  _read_with_retry "8mb_backup1.bin" "8MB chip (read 1 of 2)" "$CHIP_8MB" || return 1
+  _read_with_retry "8mb_backup2.bin" "8MB chip (read 2 of 2)" "$CHIP_8MB" || return 1
+  success "8MB chip reads complete ($CHIP_8MB)."
 }