75 lines
2.4 KiB
Bash
Executable File
75 lines
2.4 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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# Read a chip with inline retry on failure.
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# $1 = output filename
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# $2 = human label (e.g. "4MB (top) — read 1 of 2")
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_read_with_retry() {
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_out="$1"
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_label="$2"
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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 -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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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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cd "$WORK_DIR" || return 1
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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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_read_with_retry "4mb_backup1.bin" "4MB chip (read 1 of 2)" || return 1
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_read_with_retry "4mb_backup2.bin" "4MB chip (read 2 of 2)" || return 1
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success "4MB chip reads complete."
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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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_read_with_retry "8mb_backup1.bin" "8MB chip (read 1 of 2)" || return 1
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_read_with_retry "8mb_backup2.bin" "8MB chip (read 2 of 2)" || return 1
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success "8MB chip reads complete."
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}
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