nixos/memtest: Allow user to specify memtest86+ boot parameters

[wizeman]

No description provided.

[edolstra]

What are these parameters for?

[wizeman]

@edolstra To specify a serial console, for instance (as in the provided example).
I needed it because I have a server without a monitor or keyboard attached, and the only way I can interact with it during boot is via the serial console.

Here's the full list of the (apparently undocumented) parameters that memtest86+-5.01 accepts:

• console=xxx: set up a serial console
• btrace: enable boot trace
• maxcpus=xxx: limit number of CPUs
• onepass: Run one pass and exit if there are no errors
• tstlist=xxx: Setup a list of tests to run
• cpumask=xxx: Set a CPU mask to select CPUs to use for testing

[wizeman]

Fixed building ISOs.

[bjornfor]

Since the list of options isn't that long and is undocumented, how about adding that list to the "description" field of the params option?

[wizeman]

Rebased and added the list of accepted parameters to the "description" field, as suggested by @bjornfor.

[bjornfor]

@wizeman: Pushed to master. I added a commit to use docbook formatting, because when the manual was generated, the "list" structure disappeared and it became quite unreadable.

[wizeman]

@bjornfor Thanks!

[peti]

Is it possible that this patch caused #1722?

[wizeman]

@peti Yes, the syntax changed. Please see my comment in #1722.