189 lines
6.3 KiB
Bash
Executable File
189 lines
6.3 KiB
Bash
Executable File
#!/bin/sh
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# Step: Extract original BIOS from both EEPROM chips
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#
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# Order rationale: read 4MB (top) chip first — smaller, faster,
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# surfaces setup issues (clip alignment, voltage, ribbon) sooner.
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# Probe the currently-clipped chip and resolve the flashrom chip name.
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# $1 = variable name to populate (e.g. "CHIP_4MB")
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# Handles the "Multiple flash chip definitions match" case by prompting.
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_resolve_chip() {
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_var="$1"
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eval _cur=\"\$$_var\"
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if [ -n "$_cur" ]; then
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info "Using previously-selected chip for this size: $_cur"
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return 0
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fi
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_log=$(mktemp)
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while true; do
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printf " ${DIM}\$ sudo flashrom --programmer ch341a_spi${NC}\n"
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sudo flashrom --programmer ch341a_spi >"$_log" 2>&1
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_st=$?
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# Unambiguous success: one "Found ... chip \"NAME\"" line, exit 0.
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if [ $_st -eq 0 ]; then
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_chip=$(sed -nE 's/.*Found .* flash chip "([^"]+)".*/\1/p' "$_log" | head -1)
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if [ -n "$_chip" ]; then
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eval "$_var=\"\$_chip\""
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info "Detected chip: $_chip"
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rm -f "$_log"
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return 0
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fi
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fi
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# Ambiguous match: flashrom lists candidates but refuses to pick.
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if grep -q "Multiple flash chip definitions match" "$_log"; then
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_candidates=$(sed -nE 's/.*Found .* flash chip "([^"]+)".*/\1/p' "$_log")
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_count=$(printf '%s\n' "$_candidates" | wc -l | tr -d ' ')
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echo ""
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warn "Flashrom read the chip but multiple variants match the same silicon ID."
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info "This is normal for Winbond W25Q* parts. Pick one (the newest is safe):"
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echo ""
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_i=1
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for _c in $_candidates; do
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if [ "$_i" = "$_count" ]; then
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echo " $_i) $_c (default — newest)"
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else
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echo " $_i) $_c"
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fi
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_i=$((_i+1))
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done
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echo ""
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_picked=""
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while [ -z "$_picked" ]; do
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printf "${CYAN}Choice [1-%s] (Enter = %s):${NC} " "$_count" "$_count"
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read -r _sel
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[ -z "$_sel" ] && _sel="$_count"
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case "$_sel" in
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''|*[!0-9]*) echo "Enter a number."; continue ;;
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esac
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if [ "$_sel" -lt 1 ] || [ "$_sel" -gt "$_count" ]; then
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echo "Out of range."
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continue
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fi
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_picked=$(printf '%s\n' "$_candidates" | sed -n "${_sel}p")
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done
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eval "$_var=\"\$_picked\""
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info "Using chip definition: $_picked"
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rm -f "$_log"
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return 0
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fi
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# Hard failure — no chip detected. Show output and offer re-seat retry.
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echo ""
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error "Chip probe failed. flashrom output:"
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sed 's/^/ /' "$_log"
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echo ""
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warn "Most common causes:"
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echo " - Clip not seated flush on chip (press down gently, wiggle)"
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echo " - Pin 1 misaligned (red ribbon wire ↔ chip dot/notch)"
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echo " - Clipped onto the wrong chip (try the other one, then switch back)"
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echo " - Residual laptop power (remove main battery + CMOS coin cell)"
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echo " - Cheap SOIC-8 clips can make intermittent contact"
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echo ""
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echo " 1) Re-seat clip and retry"
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echo " 2) Abort"
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echo ""
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printf "${CYAN}Choice [1-2]:${NC} "
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read -r _choice
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case "$_choice" in
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1) continue ;;
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*) rm -f "$_log"; return 1 ;;
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esac
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done
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}
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# Read a chip with inline retry on failure.
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# $1 = output filename
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# $2 = human label
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# $3 = chip name (from _resolve_chip)
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_read_with_retry() {
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_out="$1"
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_label="$2"
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_chip="$3"
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while true; do
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info "Reading $_label ..."
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if run_cmd "sudo flashrom --programmer ch341a_spi -c \"$_chip\" -r $_out"; then
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return 0
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fi
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echo ""
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warn "Read failed. Most common causes:"
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echo " - Clip not seated flush on chip (try pressing down gently)"
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echo " - Pin 1 misaligned (red wire must match chip's dot/notch)"
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echo " - Laptop still has residual power (remove battery + CMOS)"
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echo " - Cheap SOIC-8 clips can make intermittent contact"
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echo ""
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echo " 1) Re-seat clip and retry"
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echo " 2) Abort"
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echo ""
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printf "${CYAN}Choice [1-2]:${NC} "
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read -r _choice
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case "$_choice" in
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1) continue ;;
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*) return 1 ;;
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esac
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done
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}
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step_extract_bios() {
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section "Extract Original BIOS"
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cd "$WORK_DIR" || return 1
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# Short-circuit: if all four backups already exist and are the right size,
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# assume the user already pulled them off the board and offer to skip.
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if [ -f 4mb_backup1.bin ] && [ -f 4mb_backup2.bin ] \
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&& [ -f 8mb_backup1.bin ] && [ -f 8mb_backup2.bin ]; then
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_s1=$(wc -c < 4mb_backup1.bin)
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_s2=$(wc -c < 8mb_backup1.bin)
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if [ "$_s1" -eq "$SIZE_4MB" ] && [ "$_s2" -eq "$SIZE_8MB" ]; then
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info "Existing backups found in $WORK_DIR:"
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echo " 4mb_backup1.bin, 4mb_backup2.bin, 8mb_backup1.bin, 8mb_backup2.bin"
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echo ""
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if prompt_yes_default "Skip re-reading the chips and use the existing backups?"; then
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success "Using existing backups. Skipping extraction."
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return 0
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fi
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fi
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fi
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info "The T440p has two EEPROM chips beside the SODIMM slots:"
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echo " - 4MB (top) — smaller SOIC-8, farther from CPU"
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echo " - 8MB (bottom) — larger SOIC-8, closer to CPU (holds ME firmware)"
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echo ""
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info "Each chip is read twice so we can diff the results and catch flaky reads."
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echo ""
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# --- 4MB chip (do first: smaller = faster iteration on setup) ---
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echo ""
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show_image "eeprom_chip_4mb.webp" "Reference: 4MB (top) chip location on T440p"
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echo ""
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info "Clip the CH341A onto the ${BOLD}4MB (top)${NC} chip shown above."
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info "Align the red ribbon wire with the dot/notch on the chip (pin 1)."
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prompt_continue
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_resolve_chip CHIP_4MB || return 1
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_read_with_retry "4mb_backup1.bin" "4MB chip (read 1 of 2)" "$CHIP_4MB" || return 1
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_read_with_retry "4mb_backup2.bin" "4MB chip (read 2 of 2)" "$CHIP_4MB" || return 1
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success "4MB chip reads complete ($CHIP_4MB)."
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# --- 8MB chip ---
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echo ""
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show_image "eeprom_chip_8mb.webp" "Reference: 8MB (bottom) chip location on T440p"
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echo ""
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info "Now move the clip to the ${BOLD}8MB (bottom)${NC} chip shown above."
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info "Re-check pin 1 alignment before pressing down."
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prompt_continue
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_resolve_chip CHIP_8MB || return 1
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_read_with_retry "8mb_backup1.bin" "8MB chip (read 1 of 2)" "$CHIP_8MB" || return 1
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_read_with_retry "8mb_backup2.bin" "8MB chip (read 2 of 2)" "$CHIP_8MB" || return 1
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success "8MB chip reads complete ($CHIP_8MB)."
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}
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