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authorMichael Bacarella <michael.bacarella@gmail.com>2018-12-03 13:31:35 -0800
committerFelix Held <felix-coreboot@felixheld.de>2018-12-05 07:02:32 +0000
commit134c30761e9a1a7c9a89823976b9cbdce11b3fce (patch)
tree1af96661dea12563bd3f7f564072b8b96d31f535 /Documentation/mainboard
parent497becf1f18d48a633e7e7bfa0b3872976091a3f (diff)
downloadcoreboot-134c30761e9a1a7c9a89823976b9cbdce11b3fce.tar.xz
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>
Diffstat (limited to 'Documentation/mainboard')
-rw-r--r--Documentation/mainboard/lenovo/t420.md13
-rw-r--r--Documentation/mainboard/lenovo/t420_chip_location.jpgbin0 -> 316180 bytes
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diff --git a/Documentation/mainboard/lenovo/t420.md b/Documentation/mainboard/lenovo/t420.md
index ff7a0a9238..6ebff0ed3e 100644
--- a/Documentation/mainboard/lenovo/t420.md
+++ b/Documentation/mainboard/lenovo/t420.md
@@ -1,8 +1,17 @@
# Lenovo T420
## Flashing instructions
-You have to disassemble the whole device, as the flash IC is on the bottom
-of the mainboard.
+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!
For more details have a look at [T420 / T520 / X220 / T420s / W520 common] and
diff --git a/Documentation/mainboard/lenovo/t420_chip_location.jpg b/Documentation/mainboard/lenovo/t420_chip_location.jpg
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