mb/lenovo/{t60,r60}: Add ThinkPad R60 support as variant board

- This port should be Reclaim Your Freedom compliant
  (not certified yet).
- Untested on boards with external Radeon graphics adapter.
- Some columns on the left-most side of display are completely
  black on 1400x1050 IPS display[1]. Display works fine on Linux.
  I don't know why it appears like that. So far it has been observed
  only with native graphics initialization.
- Only GRUB2 and SeaBIOS payloads tested for now.
- 2504 docking station USB doesn't work under Linux.
  Can detect pendrive in GRUB2 payload.
- Sometimes it takes 20s of "pretending it's powered off" to run
  coreboot code. Issue is payload agnostic.
  Probably caused by missing one capacitor on my unit.

[1] https://imgur.com/a/0wpMGsm

Change-Id: Ibd9208a5eafd228f8eedbc8fb4f4eb9ed1932a14
Signed-off-by: Maciej Matuszczyk <maccraft123mc@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35864
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

2 files changed, 44 insertions, 0 deletions

diff --git a/Documentation/mainboard/lenovo/r60.md b/Documentation/mainboard/lenovo/r60.md
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+# Lenovo Thinkpad R60
+
+Untested on boards with external Radeon graphics adapter. If you have such
+board, proceed at your own risk and document if it does work.
+
+## Flashing instructions
+
+### External flashing
+
+The flash IC is located at the bottom center of the mainboard. Access to
+the flash chip is blocked by the magnesium frame, so you need to disassemble
+the entire laptop and remove the mainboard. The flash chip is referenced as U49 in
+the schematics and in the boardview.
+
+![](r60_chip.jpg)
+
+To disassemble the laptop, follow the [Hardware Maintenance Manual](https://thinkpads.com/support/hmm/hmm_pdf/42x3749_02.pdf).
+
+### Internal flashing on Vendor BIOS
+
+This [method](https://gist.github.com/ArthurHeymans/c5ef494ada01af372735f237f6c6adbe) describes a way to install coreboot with vendor firmware still
+installed on the Lenovo Thinkpad X60. It is reported to also work in Thinkpad
+R60, with the only difference being the board target you build coreboot for.
+
+### Flashing on coreboot
+
+Default configuration of coreboot doesn't feature any flash restrictions
+like the vendor firmware, therefore flashrom is able to flash any rom without problems.
+
+## Things tested and working in Linux 5.3:
+
+- Intel WiFi card
+- Suspend and resume
+- Native graphics initialization. Both legacy VGA and linear framebuffer work
+- GRUB2 2.04 and SeaBIOS 1.12.1 payloads
+- Reflashing with flashrom (use flashrom-git as of 17.09.2019)
+- 2G+1G memory configuration working
+- 2504 dock USB ports if not hotplugged
+
+## Things tested and not working:
+
+- 2504 dock hotplugging
+- Black bar at the left side of the screen. Doesn't appear in Linux. See picture at top
+- Sometimes it takes several second to run coreboot. Just wait for it
diff --git a/Documentation/mainboard/lenovo/r60_chip.jpg b/Documentation/mainboard/lenovo/r60_chip.jpg
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+++ b/Documentation/mainboard/lenovo/r60_chip.jpg