Re: [PATCH v1 06/12] website: docs: install: flashrom: document I/O port access.

[Adrien 'neox' Bourmault]

Le mardi 11 juin 2024 à 20:52 +0200, Denis 'GNUtoo' Carikli a écrit :
> From: Leah Rowe <leah@libreboot.org>
> 
> 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>
> ---
>  website/pages/docs/install/install.md | 32 +++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/website/pages/docs/install/install.md
> b/website/pages/docs/install/install.md
> index 3e4d1ca..aeba7b1 100644
> --- a/website/pages/docs/install/install.md
> +++ b/website/pages/docs/install/install.md
> @@ -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
>  ==========================
>  

Acked-by: Adrien 'neox' Bourmault <neox@gnu.org>

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