Safe Mode

[Geezer]

In the boot menu, Boot Options brings up Safe Mode, Single User and Verbose.

It is in 13.0. Maybe it was in previous versions, but I did not notice.

Anyway, I know what single user and verbose mean. What is Safe Mode? I thought that was some peculiarity of windows.

 

[mark_j]

It's not new, it's been around for a long time.
Basically it starts FreeBSD with no SMP, no DMA on various I/O buses, won't probe for devices, do integrity checks on hard disks/SSDs etc etc. I think, basically, it's like Windows safe mode in that it doesn't load a lot of stuff that could be causing your problem; whatever that problem should be. It does permit networking.

(At least that's what it used to do, it may have changed over the years).

 

[Cath O'Deray]

no SMP, no DMA on various I/O buses, won't probe for devices, do integrity checks on hard disks/SSDs etc

menu-commands.4th « forth « stand - src - FreeBSD source tree

cgit.freebsd.org

core.lua « lua « stand - src - FreeBSD source tree

cgit.freebsd.org

 

[mark_j]

Haha, so my notes are still good, although, wasn't Forth abandoned by FreeBSD in favour of LUA?

 

[Cath O'Deray]

Good point.

I see <https://cgit.freebsd.org/src/tree/stand/lua> but <https://gitlab.com/search?search=set kern.smp.disabled&project_id=19317362&group_id=765080> finds set kern.smp.disabled in only one file. I don't know my way around the code.

 

[mark_j]

It's in core.lua, lines 173 onwards.

 

[Cath O'Deray]

Thanks! I edited a link into my first comment.

 

[Cath O'Deray]

FreeBSD bug 260812 – Safe boot (safe mode): improve documentation

(This topic was mentioned in IRC.)