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website: docs: install: flashrom: document I/O port access. 

Signed-off-by: Leah Rowe <leah@libreboot.org>
Signed-off-by: Leah Rowe <info@minifree.org>
GNUtoo: fixed section underline, rebased, commit message, split patch.
Acked-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
Acked-by: Adrien 'neox' Bourmault <neox@gnu.org>
This commit is contained in:
Leah Rowe 2024-06-07 15:32:48 +02:00 committed by Denis 'GNUtoo' Carikli
parent 46c6326474
commit 4dd202a4ba
Signed by: GNUtoo
GPG Key ID: 5F5DFCC14177E263
1 changed files with 32 additions and 0 deletions
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website/pages/docs/install/install.md
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@ -35,6 +35,38 @@ is `kernel.securelevel=-1`; see [NetBSD securelevel
manual](https://wiki.netbsd.org/tutorials/kernel_secure_levels/)
and [OpenBSD securelevel manual](https://man.openbsd.org/securelevel).
ERROR: Could not get I/O privileges
-----------------------------------
Error message: `ERROR: Could not get I/O privileges (Function not implemented)`
If you get this while running `flashrom -p internal -w filename.rom` (or any
internal flash operation), note: flashrom heavily uses ioperm/iopl functions
to operate the internal flasher, at least on x86 machines.
See: <https://lwn.net/Articles/804143/>
Yeah, just enable `CONFIG_X86_IOPL_IOPERM` in your Linux kernel. This is
a *build-time* option, so you must re-compile your kernel, or find a build that
has this option enabled (IOPL emulation). Many default kernel configurations
now disable this option.
Here's a handy-dandy guide for building a kernel from source:
<https://www.cyberciti.biz/tips/compiling-linux-kernel-26.html> - NOTE: the
GNU Boot project recommends use of linux-libre, not linux, but this guide should
work with linux-libre releases. Here is GNU Linux-libre, the deblobbed linux
kernel:
<https://www.fsfla.org/ikiwiki/selibre/linux-libre/index.en.html>
**BSD users:** On OpenBSD and NetBSD if you get similar errors, note that it
should work here, but you need to boot with `kern.securelevel=-1`.
See: [NetBSD securelevel manual](https://wiki.netbsd.org/tutorials/kernel_secure_levels/)
and [OpenBSD securelevel manpage](https://man.openbsd.org/securelevel).
Otherwise, if you get such errors, it may just be that you're not root. You
must run flashrom as root, at least to use the internal flasher (using external
USB flashing dongles doesn't normally require root).
About ROM image file names
==========================