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Diffstat (limited to 'Documentation/mainboard')
| -rw-r--r-- | Documentation/mainboard/hp/compaq_8200_sff.md | 109 | ||||
| -rw-r--r-- | Documentation/mainboard/hp/compaq_8200_sff_jumper.jpg | bin | 0 -> 147708 bytes |
2 files changed, 89 insertions, 20 deletions
diff --git a/Documentation/mainboard/hp/compaq_8200_sff.md b/Documentation/mainboard/hp/compaq_8200_sff.md index 3e83e25060..72df9e3e02 100644 --- a/Documentation/mainboard/hp/compaq_8200_sff.md +++ b/Documentation/mainboard/hp/compaq_8200_sff.md @@ -14,30 +14,99 @@ The following things are still missing from this coreboot port: ## Flashing coreboot ```eval_rst -+---------------------+------------+ -| Type | Value | -+=====================+============+ -| Socketed flash | no | -+---------------------+------------+ -| Model | MX25L6406E | -+---------------------+------------+ -| Size | 8 MiB | -+---------------------+------------+ -| In circuit flashing | yes | -+---------------------+------------+ -| Package | SOIC-8 | -+---------------------+------------+ -| Write protection | No | -+---------------------+------------+ -| Dual BIOS feature | No | -+---------------------+------------+ -| Internal flashing | yes | -+---------------------+------------+ ++---------------------+-------------------------+ +| Type | Value | ++=====================+=========================+ +| Socketed flash | no | ++---------------------+-------------------------+ +| Model | MX25L6406E/MX25L6408E | ++---------------------+-------------------------+ +| Size | 8 MiB | ++---------------------+-------------------------+ +| In circuit flashing | yes | ++---------------------+-------------------------+ +| Package | SOIC-8 | ++---------------------+-------------------------+ +| Write protection | bios region | ++---------------------+-------------------------+ +| Dual BIOS feature | No | ++---------------------+-------------------------+ +| Internal flashing | yes | ++---------------------+-------------------------+ +``` + +### Flash layout +The original layout of the flash should look like this: +``` +00000000:00000fff fd +00510000:007fffff bios +00003000:0050ffff me +00001000:00002fff gbe ``` ### Internal programming The SPI flash can be accessed using [flashrom]. +```console +$ flashrom -p internal -c MX25L6406E/MX25L6408E -w coreboot.rom +``` + +After shorting the FDO jumper you gain access to the full flash, but you +still cannot write in the bios region due to SPI protected ranges. + +**Position of FDO jumper close to the IO and second fan connector** +![][compaq_8200_jumper] + +[compaq_8200_jumper]: compaq_8200_sff_jumper.jpg + +To write to the bios region you can use an [IFD Hack] originally developed +for MacBooks, but with modified values described in this guide. +You should read both guides before attempting the procedure. + +Since you can still write in the flash descriptor, you can shrink +the ME and then move the bios region into where the ME originally was. +coreboot does not by default restrict writing to any part of the flash, so +you will first flash a small coreboot build and after it boots, flash +the full one. + +The temporary flash layout with the neutered ME firmware should look like this: +``` +00000000:00000fff fd +00023000:001fffff bios +00003000:00022fff me +00001000:00002fff gbe +00200000:007fffff pd +``` + +It is very important to use these exact numbers or you will need to fix it +using external flashing, but you should already be familiar with the risks +if you got this far. + +The temporary ROM chip size to set in menuconfig is 2 MB but the default +CBFS size is too large for that, you can use up to about 0x1D0000. + +When building both the temporary and the permanent installation, don't forget +to also add the gigabit ethernet configuration when adding the flash descriptor +and ME firmware. + +You can pad the ROM to the required 8MB with zeros using: +```console +$ dd if=/dev/zero of=6M.bin bs=1024 count=6144 +$ cat coreboot.rom 6M.bin > coreboot8.rom +``` + +If you want to continue using the neutered ME firmware use this flash layout +for stage 2: +``` +00000000:00000fff fd +00023000:007fffff bios +00003000:00022fff me +00001000:00002fff gbe +``` + +If you want to use the original ME firmware use the original flash layout. + +More about flashing internally and getting the flash layout [here](../../tutorial/flashing_firmware/index.md). ### External programming @@ -74,7 +143,7 @@ as otherwise there's not enough space near the flash. | Coprocessor | Intel ME | +------------------+--------------------------------------------------+ ``` - +[IFD Hack]: https://review.coreboot.org/plugins/gitiles/coreboot/+/refs/changes/70/38770/4/Documentation/flash_tutorial/int_macbook.md/ [Compaq 8200 Elite SFF]: https://support.hp.com/us-en/document/c03414707 [HP]: https://www.hp.com/ [flashrom]: https://flashrom.org/Flashrom diff --git a/Documentation/mainboard/hp/compaq_8200_sff_jumper.jpg b/Documentation/mainboard/hp/compaq_8200_sff_jumper.jpg Binary files differnew file mode 100644 index 0000000000..ba307464bc --- /dev/null +++ b/Documentation/mainboard/hp/compaq_8200_sff_jumper.jpg |
