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diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md index 4383582b58..5df4885e1a 100644 --- a/Documentation/mainboard/index.md +++ b/Documentation/mainboard/index.md @@ -20,6 +20,10 @@ The boards in this section are not real mainboards, but emulators. - [Spike RISC-V emulator](emulation/spike-riscv.md) +## Intel + +- [DG43GT](intel/dg43gt.md) + ## Foxconn - [D41S](foxconn/d41s.md) diff --git a/Documentation/mainboard/intel/dg43gt.md b/Documentation/mainboard/intel/dg43gt.md new file mode 100644 index 0000000000..fac08bda68 --- /dev/null +++ b/Documentation/mainboard/intel/dg43gt.md @@ -0,0 +1,99 @@ +# Intel DG43GT + +This page describes how to run coreboot on the [Intel DG43GT] desktop. + +## Flashing coreboot + +```eval_rst ++---------------------+------------+ +| Type | Value | ++=====================+============+ +| Socketed flash | no | ++---------------------+------------+ +| Model | W25X32 | ++---------------------+------------+ +| Size | 4 MiB | ++---------------------+------------+ +| In circuit flashing | NO! | ++---------------------+------------+ +| Package | SOIC-8 | ++---------------------+------------+ +| Write protection | No | ++---------------------+------------+ +| Dual BIOS feature | No | ++---------------------+------------+ +| Internal flashing | yes | ++---------------------+------------+ +``` + +### Internal programming + +The SPI flash can be accessed internally using [flashrom]. +Only the BIOS region can and needs to be written to. + +```bash + $ flashrom -p internal --ifd -i bios -w coreboot.rom --noverify-all +``` + +### External programming + +ISP (in circuit programming) seems to be impossible on this board, which +is a property it shares with many boards featuring the ICH10 southbridge. +**Recovering from a bad flash will require desoldering the flash!** +Desoldering the SPI flash can easily be done with a hot air station. +Apply some flux around the SPI flash, set the hot air station to 350-400°C +and after heating the chip up for a minute it should be possible to remove it. + +Having removed the flash chip, you can reprogram it externally then resolder +it using a soldering iron. +Another option would be to hook up a SPI flash (socket) to the SPI header, +for easier flash removing in the future (if you expect to be hacking on this +board). To do this you first need to solder the SPI header to the board. + +**NOTE: This header cannot be used for ISP either.** + +**NOTE2: Don't forget to connect the WP# and HOLD# pin on the SPI flash to 3.3V.** + +The layout of the header is: + +``` + +---+---+ + GND <- | x | x | -> SPI_CLK + +---+---+ + 3VSB <- | x | x | -> SPI_MISO + +---+---+ + | | x | -> SPI_MOSI + +---+---+ + SPI_CS# <-| x | x | -> SPI_CS# (again) + +---+---+ +``` + +**Picture of the board with the flash hooked on externally** +![][dg43gt_full] + +**Close up picture of the SPI flash pads and recovery header** +![][dg43gt_closeup] + +[dg43gt_full]: dg43gt_full.jpg +[dg43gt_closeup]: dg43gt_closeup.jpg + +## Technology + +```eval_rst ++------------------+---------------------------------------------------+ +| Northbridge | Intel G43 (called x4x in coreboot code) | ++------------------+---------------------------------------------------+ +| Southbridge | Intel ICH10 (called i82801jx in coreboot code) | ++------------------+---------------------------------------------------+ +| CPU (LGA775) | model f4x, f6x, 6fx, 1067x (pentium 4, d, core 2) | ++------------------+---------------------------------------------------+ +| SuperIO | Winbond W83627DHG | ++------------------+---------------------------------------------------+ +| Coprocessor | Intel ME (optionally enabled) | ++------------------+---------------------------------------------------+ +| Clockgen (CK505) | SLG8XP549T | ++------------------+---------------------------------------------------+ +``` + +[Intel DG43GT]: https://ark.intel.com/products/41036/Intel-Desktop-Board-DG43GT +[flashrom]: https://flashrom.org/Flashrom diff --git a/Documentation/mainboard/intel/dg43gt_closeup.jpg b/Documentation/mainboard/intel/dg43gt_closeup.jpg Binary files differnew file mode 100644 index 0000000000..c747aa80dc --- /dev/null +++ b/Documentation/mainboard/intel/dg43gt_closeup.jpg diff --git a/Documentation/mainboard/intel/dg43gt_full.jpg b/Documentation/mainboard/intel/dg43gt_full.jpg Binary files differnew file mode 100644 index 0000000000..52f3808a07 --- /dev/null +++ b/Documentation/mainboard/intel/dg43gt_full.jpg |
