1# HP Compaq 8200 Elite SFF 2 3This page describes how to run coreboot on the [Compaq 8200 Elite SFF] desktop 4from [HP]. 5 6## TODO 7 8The following things are still missing from this coreboot port: 9 10- Extended HWM reporting 11- Advanced LED control 12- Advanced power configuration in S3 13 14## Flashing coreboot 15 16```{eval-rst} 17+---------------------+-------------------------+ 18| Type | Value | 19+=====================+=========================+ 20| Socketed flash | no | 21+---------------------+-------------------------+ 22| Model | MX25L6406E/MX25L6408E | 23+---------------------+-------------------------+ 24| Size | 8 MiB | 25+---------------------+-------------------------+ 26| In circuit flashing | yes | 27+---------------------+-------------------------+ 28| Package | SOIC-8 | 29+---------------------+-------------------------+ 30| Write protection | bios region | 31+---------------------+-------------------------+ 32| Dual BIOS feature | No | 33+---------------------+-------------------------+ 34| Internal flashing | yes | 35+---------------------+-------------------------+ 36``` 37 38### Flash layout 39The original layout of the flash should look like this: 40``` 4100000000:00000fff fd 4200510000:007fffff bios 4300003000:0050ffff me 4400001000:00002fff gbe 45``` 46 47### Internal programming 48 49The SPI flash can be accessed using [flashrom]. 50```console 51$ flashrom -p internal -c MX25L6406E/MX25L6408E -w coreboot.rom 52``` 53 54After shorting the FDO jumper you gain access to the full flash, but you 55still cannot write in the bios region due to SPI protected ranges. 56 57**Position of FDO jumper close to the IO and second fan connector** 58![][compaq_8200_jumper] 59 60[compaq_8200_jumper]: compaq_8200_sff_jumper.jpg 61 62To write to the bios region you can use an [IFD Hack] originally developed 63for MacBooks, but with modified values described in this guide. 64You should read both guides before attempting the procedure. 65 66Since you can still write in the flash descriptor, you can shrink 67the ME and then move the bios region into where the ME originally was. 68coreboot does not by default restrict writing to any part of the flash, so 69you will first flash a small coreboot build and after it boots, flash 70the full one. 71 72The temporary flash layout with the neutered ME firmware should look like this: 73``` 7400000000:00000fff fd 7500023000:001fffff bios 7600003000:00022fff me 7700001000:00002fff gbe 7800200000:007fffff pd 79``` 80 81It is very important to use these exact numbers or you will need to fix it 82using external flashing, but you should already be familiar with the risks 83if you got this far. 84 85The temporary ROM chip size to set in menuconfig is 2 MB but the default 86CBFS size is too large for that, you can use up to about 0x1D0000. 87 88When building both the temporary and the permanent installation, don't forget 89to also add the gigabit ethernet configuration when adding the flash descriptor 90and ME firmware. 91 92You can pad the ROM to the required 8MB with zeros using: 93```console 94$ dd if=/dev/zero of=6M.bin bs=1024 count=6144 95$ cat coreboot.rom 6M.bin > coreboot8.rom 96``` 97 98If you want to continue using the neutered ME firmware use this flash layout 99for stage 2: 100``` 10100000000:00000fff fd 10200023000:007fffff bios 10300003000:00022fff me 10400001000:00002fff gbe 105``` 106 107If you want to use the original ME firmware use the original flash layout. 108 109More about flashing internally and getting the flash layout [here](../../tutorial/flashing_firmware/index.md). 110 111### External programming 112 113External programming with an SPI adapter and [flashrom] does work, but it powers the 114whole southbridge complex. You need to supply enough current through the programming adapter. 115 116If you want to use a SOIC pomona test clip, you have to cut the 2nd DRAM DIMM holder, 117as otherwise there's not enough space near the flash. 118 119**Position of SOIC-8 flash IC near 2nd DIMM holder** 120![][compaq_8200_flash1] 121 122[compaq_8200_flash1]: compaq_8200_sff_flash1.jpg 123 124**Closeup view of SOIC-8 flash IC** 125![][compaq_8200_flash2] 126 127[compaq_8200_flash2]: compaq_8200_sff_flash2.jpg 128 129## Technology 130 131```{eval-rst} 132+------------------+--------------------------------------------------+ 133| Northbridge | :doc:`../../northbridge/intel/sandybridge/index` | 134+------------------+--------------------------------------------------+ 135| Southbridge | bd82x6x | 136+------------------+--------------------------------------------------+ 137| CPU | model_206ax | 138+------------------+--------------------------------------------------+ 139| SuperIO | :doc:`../../superio/nuvoton/npcd378` | 140+------------------+--------------------------------------------------+ 141| EC | | 142+------------------+--------------------------------------------------+ 143| Coprocessor | Intel ME | 144+------------------+--------------------------------------------------+ 145``` 146[IFD Hack]: https://review.coreboot.org/plugins/gitiles/coreboot/+/refs/changes/70/38770/4/Documentation/flash_tutorial/int_macbook.md/ 147[Compaq 8200 Elite SFF]: https://support.hp.com/us-en/document/c03414707 148[HP]: https://www.hp.com/ 149[flashrom]: https://flashrom.org/Flashrom 150
