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diff --git a/Documentation/mainboard/lenovo/t431s.md b/Documentation/mainboard/lenovo/t431s.md new file mode 100644 index 0000000000..146e1c12a3 --- /dev/null +++ b/Documentation/mainboard/lenovo/t431s.md @@ -0,0 +1,42 @@ +# Lenovo T431s + +## Disassembly Instructions + +You must remove the following parts before flipping the mainboard +off the main frame: + + + +* Base cover +* Hard disk drive +* Battery pack +* Keyboard + +Its [Hardware Maintenance Manual](https://thinkpads.com/support/hmm/hmm_pdf/t431s_hmm_en_0c10894_02.pdf) could be used as a guidance of disassembly. + + + +The WSON-8 flash chip (surrounded with red circle in the photo above) +sits on the opposite side of the mainboard, under a piece of insulating +tape. If solders between the chip and soldering pads fortunately +overflows beside the chip as tiny tin balls attached to soldering pads, +it will be possible to use a pomona 5250 clip to hold the chip, with +its metal tips just attached to tin balls, thus connecting the chip to +the programmer. + + + +```eval_rst +:doc:`../../flash_tutorial/ext_power` +``` + +Currently, detecting the model of soldered RAM at runtime and loading +the corresponding SPD datum from CBFS is not implemented yet. You may +have to dump the SPD data when running the vendor firmware with +inteltool, and replace the content of the SPD hex with what is dumped. + +(the mechanism may be similar to that on x1_carbon_gen1 and s230u, but +I do not know how to find gpio ports for that, and SPD data stored in +vendor firmware.) + +[T420 / T520 / X220 / T420s / W520 common]: xx20_series.md |