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coreboot-kgpe-d16/Documentation/mainboard/up/squared/index.md

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Squared

Overview

Top

Bottom

Mainboard components

Platform

+------------------+----------------------------------+
| CPU              | Intel Atom, Celeron, Pentium     |
+------------------+----------------------------------+
| PCH              | Intel Apollo Lake                |
+------------------+----------------------------------+
| EC / Super IO    | N/A                              |
+------------------+----------------------------------+
| Coprocessor      | Intel TXE 3.0                    |
+------------------+----------------------------------+

Flash chip

+---------------------+------------+
| Type                | Value      |
+=====================+============+
| Socketed flash      | no         |
+---------------------+------------+
| Vendor              | Winbond    |
+---------------------+------------+
| Model               | W25Q128FW  |
+---------------------+------------+
| Voltage             | 1.8V       |
+---------------------+------------+
| Size                | 16 MiB     |
+---------------------+------------+
| Package             | SOIC-8     |
+---------------------+------------+
| Write protection    | No         |
+---------------------+------------+
| Internal flashing   | No         |
+---------------------+------------+
| In curcuit flashing | Yes        |
+---------------------+------------+

Board status

Working

  • bootblock, romstage, ramstage
  • Serial console UART0, UART1
  • SPI flash console
  • iGPU init with libgfxinit
  • LAN1, LAN2
  • USB2, USB3
  • HDMI, DisplayPort
  • eMMC
  • flashing with flashrom externally

Work in progress

  • Documentation
  • ACPI

Not working / Known issues

  • Generally SeaBIOS works, but it can't find the CBFS region and therefore it can't load seavgabios. This is because of changes at the Apollolake platform.

Untested

  • GPIO pin header
  • 60 pin EXHAT
  • Camera interface
    • MIPI-CSI2 2-lane (2MP)
    • MIPI-CSI2 4-lane (8MP)
  • SATA3
  • USB3 OTG
  • embedded DisplayPort
  • M.2 slot
  • mini PCIe
  • flashing with flashrom internally using Linux

Building and flashing coreboot

Building

make distclean
touch .config
./util/scripts/config --enable VENDOR_UP
./util/scripts/config --enable BOARD_UP_SQUARED
./util/scripts/config --enable NEED_IFWI
./util/scripts/config --enable HAVE_IFD_BIN
./util/scripts/config --set-str IFWI_FILE_NAME "<path_to_your_bios_region>"
./util/scripts/config --set-str IFD_BIN_PATH "<path_to_your_ifd_region>"
make olddefconfig

Flashing