6.3 KiB
| title | x-toc-enable |
|---|---|
| Dell OptiPlex 780 MT/USFF | true |
The build target, when building from source, is thus:
./mk -b coreboot dell780mt_truncate_8mb
./mk -b coreboot dell780mt_8mb
./mk -b coreboot dell780usff_truncate_8mb
./mk -b coreboot dell780usff_8mb
The _truncate image is needed if you're flashing Canoeboot internally from
the original Dell firmware. Otherwise, you only need the regular images that
lack _truncate in the file name.
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This mainboard does not rely on any binary blobs in the flash. It is using the Intel X4X / ICH10 platform, same as on the already supported Gigabyte GA-G41M-ES2L mainboard.
Installation
Set MAC address
This platform uses an Intel Flash Descriptor, and defines an Intel GbE NVM region. As such, release/build ROMs will contain the same MAC address. To change the MAC address, please read nvmutil documentation.
WARNING about CPU/GPU compatibility
Coreboot has libre initialisation code for Intel graphics, but libre initialisation code is not available for most graphics cards. This machine can take any graphics card that fits in the PCI-E slot. When a graphics card is used, SeaBIOS executes its VGA ROM which provides video init, instead of coreboot's native Intel video init. GRUB piggybacks off of what SeaBIOS did, so the GRUB payload will also work.
Flash a ROM image (software)
Always make sure to dump a copy of the current flash first. ALSO: make sure /dev/mem protection is disabled for the flashing to work!
If you're already running Canoeboot, and you don't have flash protection turned on, internal flashing is possible.
If you have factory firmware (Dell), you can short the service jumper. It's a 2-pin header located somewhere on the board (no photos available yet).
With the service jumper set, all flash protections are disabled on the first 6MB of the flash; the latter 2MB part is restricted. Because we are using an Intel Flash Descriptor on this board, the flash will be divided into these parts:
- Intel Flash Descriptor (basic machine configuration)
- Intel Gigabit Ethernet region (e.g. MAC address configuration)
- BIOS region (contains coreboot)
Before you can use the flash commands, please note that the _truncate images
are 6MB in size, but they must be padded to 8MB. Normally a blank part of flash
should ideally be all 0xFF, but here we do:
dd if=/dev/zero of=2mb.bin bs=2M count=1
cat canoeboot6mb.rom 2mb.bin > canoeboot.rom
If you're not using the truncate images, you can ignore the above steps.
The Flash Descriptor can be thought of more like a partition table for the
flash, at least in our use-case scenario. The _truncate images configure
the flash such that only the first 6MB is used, with the BIOS region ending
at that limit; the upper 2MB is specified as the platform data region, in
Canoeboot's configuration. To flash it, do this:
./flashprog -p internal --ifd -i fd -w canoeboot.rom
./flashprog -p internal --ifd -i gbe -w canoeboot.rom
./flashprog -p internal --ifd -i bios -w canoeboot.rom
It's very important to do this in the exact order as above, because
the --ifd option references the flashed IFD, not the one in your image,
so you must flash the IFD first.
If you already have Canoeboot running, and you don't have flash protection
enabled, you can omit --ifd -i REGION from the flashprog command, and flash
the full image; the one without _truncate in the file name uses all of the
flash, with the BIOS region ending at the 8MB limit, so the BIOS region is
therefore 2MB larger on those images.
Flash a ROM image (hardware)
For general information, please refer to 25xx NOR flash instructions - that page refers to use of socketed flash.
No photos yet available.