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coreboot-kgpe-d16/Documentation/mainboard/lenovo/t420.md

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Documentation: Add basic flashing tutorial for Lenovo * Add basic flashing tutorial ** Describe internal and external flashing ** Describe flash supply diode protection ** Gives general advices on flashing ** Describe how to use flashrom --ifd * Describe basic flashing on Lenovo T4xx devices ** Describe how to disassemble and access the flash IC on T4xx ** Describe flash layout on Sandy Bridge and Ivy Bridge series. Change-Id: Ia833e27f4e7d89ee32be9bed21a0c021839facec Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/27852 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
2018-08-04 10:04:45 +02:00
# Lenovo T420
## Flashing instructions
Documentation/mainboard/lenovo/t420.md: add pic of chip Provide pic of the flash IC with pinouts labeled, as well as additional text about the chip. Signed-off-by: Michael Bacarella <michael.bacarella@gmail.com> Change-Id: I9046fa63dcd4d192836417efac68ca7587ac1c91 Signed-off-by: Michael Bacarella <michael.bacarella@gmail.com> Reviewed-on: https://review.coreboot.org/c/30027 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Rudolph <siro@das-labor.org>
2018-12-03 22:31:35 +01:00
The flash IC is located at the bottom center of the mainboard. Sadly,
access to the IC is blocked by the magnesum frame, so you need to disassemble
the entire laptop and remove the mainboard.
Below is a picture of IC on the mainboard, with the pinouts labeled.
[t420_chip_location]: t420_chip_location.jpg
The chip will either be a Macronix MX25L6404E (shown above) or a Winbond
W25Q64CVSIG. Do not rely on dots painted in the corner of the chip (such as
the blue dot pictured) to orient the pins!
Documentation: Add basic flashing tutorial for Lenovo * Add basic flashing tutorial ** Describe internal and external flashing ** Describe flash supply diode protection ** Gives general advices on flashing ** Describe how to use flashrom --ifd * Describe basic flashing on Lenovo T4xx devices ** Describe how to disassemble and access the flash IC on T4xx ** Describe flash layout on Sandy Bridge and Ivy Bridge series. Change-Id: Ia833e27f4e7d89ee32be9bed21a0c021839facec Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/27852 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
2018-08-04 10:04:45 +02:00
For more details have a look at [T420 / T520 / X220 / T420s / W520 common] and
```eval_rst
:doc:`../../flash_tutorial/ext_power`
```
Steps to access the flash IC are described here [T4xx series].
[T4xx series]: t4xx_series.md
[T420 / T520 / X220 / T420s / W520 common]: xx20_series.md