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Documentation: Clarify minor detail on preparing a layout file 

The user needs to pass the original firmware image to create
a layout file, not the newly compiled coreboot image.

Signed-off-by: Michael Bacarella <michael.bacarella@gmail.com>
Change-Id: If47a88f06076da12d8da7a873c3e5ef64fc1f877
Reviewed-on: https://review.coreboot.org/c/30024
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Michael Bacarella 2018-12-03 11:23:43 -08:00 committed by Patrick Georgi
parent be1907a513
commit 106a0823c9
1 changed files with 3 additions and 2 deletions
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Documentation/flash_tutorial/index.md
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@ -68,10 +68,11 @@ On platforms where the flash IC is shared with other components you might want
to write only a part of the flash IC. On Intel for example there are IFD, ME and to write only a part of the flash IC. On Intel for example there are IFD, ME and
GBE which don't need to be updated to install coreboot. GBE which don't need to be updated to install coreboot.
To make [flashrom] only write the *bios* region, leaving Intel ME and Intel IFD To make [flashrom] only write the *bios* region, leaving Intel ME and Intel IFD
untouched, you can use a layout file, which can be created using ifdtool untouched, you can use a layout file, which can be created with ifdtool and a backup
of the original firmware.
```bash ```bash
ifdtool -f rom.layout coreboot.rom ifdtool -f rom.layout backup.rom
``` ```
and looks similar to: and looks similar to: