Have trick, not sure where to document...

[Bob Bishop]

Hi,

> On 6 Nov 2020, at 10:23, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> 
> I had some trouble with a particular remote site, and wanted to have
> the hardware watchdog protect the boot-sequence, but the BIOS had no
> support for this.
> 
> The solution I found was to use the UEFI shell to arm the watchdog
> before the actuall boot.
> 
> After digging around in the abysmal UEFI ecosystem some time, I ended
> up with a bunch of "MM" commands in startup.nsh, before it launches
> BOOTx64.efi:
> 
> 	MM 4e ;IO :87 -n
> 	MM 4e ;IO :87 -n
> 	MM 4e ;IO :20 -n
> 	MM 4f ;IO -n
> 	MM 4e ;IO :21 -n
> 	MM 4f ;IO -n
> 	[...]
> 	MM 4e ;IO :aa -n
> 	BOOTx64.efi
> 
> This seems like a genuinely useful trick to have in the tool-box
> and now I'm trying to find out where in our documentation something
> like this belongs ?
> 
> It seems too specialized and with too many sharp edges for the handbook ?
> 
> Wiki/UEFI seems rather historical...
> 
> Suggestions ?

boot(8). If that is deemed inappropriate, then boot(8) should definitely have a reference to the actual place.

> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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> 

--
Bob Bishop
rb at gid.co.uk