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install/nvmutil: Safer cat/de-cat instructions 

Signed-off-by: Leah Rowe <leah@libreboot.org>
master
Leah Rowe 2025-01-04 15:34:11 +00:00
parent 2361a1de72
commit c587cee2ac
1 changed files with 15 additions and 3 deletions
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18
site/docs/install/nvmutil.md
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@ -140,7 +140,16 @@ a single-flash setup. In that case, it's recommended to dump
both chips, as `spi1.rom` and `spi2.rom`; you can then cat both chips, as `spi1.rom` and `spi2.rom`; you can then cat
them together: them together:
cat spi1.rom spi2.rom > rom.bin cat spi1.rom spi2.rom > rom.bin # WARNING: see note below
**WARNING: After concatenating the files, please ensure that you did so in
the correct order. In `hexdump -C rom.bin` you can check for the Intel Flash
Descriptor near the start of the file, for the bytes `5a a5 f0 0f`. You may
alternatively attempt extraction with `ifdtool -x rom.bin`, adding
the `--platform OPTION` option if needed, based on output from `--help` if
you need to (it lists platform strings for certain newer Intel platforms). If
ifdtool extraction fails, then that is another indication that you did not
cat the files correctly.**
If your GbE region is locked (per IFD settings), you can dump If your GbE region is locked (per IFD settings), you can dump
and flash it using external flashing equipment. The Libreboot and flash it using external flashing equipment. The Libreboot
@ -251,8 +260,11 @@ the `-p internal` parameter to something else. In this
situation, you should re-split the file accordingly, if situation, you should re-split the file accordingly, if
you have a dual-IC flash set, like so: you have a dual-IC flash set, like so:
dd if=rom.bin.new of=spi2.rom bs=1M skip=8 dd if=rom.bin.new of=spi2.rom bs=1M skip=8 # WARNING: see note below
dd if=rom.bin.new of=spi1.rom bs=1M count=8 dd if=rom.bin.new of=spi1.rom bs=1M count=8 # WARNING: see note below
**WARNING: The commands above assume SPI1 is 8MB and SPI2 is 4MB, making 12MB
total. Please adapt accordingly, for your own configuration.**
These files would then be flashed externally, separately, These files would then be flashed externally, separately,
using an external programmer. using an external programmer.