On 2015-07-12 04:44, Tomoaki AOKI wrote:
Hi. I'd have to chime in. ;-)
There are at least 4 ways of workarounds, including yours (1).
1: Offset GPT entry in PMBR. (First posted by Chris Torek.)
2: Mimic ESP [use 0xEF instead of 0xEE] (Need patch for loader.)
3: Use UEFI loader. (Currently clean root-on-ZFS is NOT supported)
4: Use MBR instead of GPT. (No large disk support)
5. Some machines also require the 0xEE partition be set active
Separately, I have also used: 6. 'Use BSD partitioning instead of GPT'
This happens to be what the FreeBSD installer memsticks use, and why
they never had problems booting on the Lenovos
My first solution was 2, but the patched loader possibly misbehave if
separate ESP (EFI System Partition) exists. (Hybrid MBR case, not
tested.)
I've tested 3 only with memstick.img built with head. Not with actual
HDD installation. (ThinkPad T420)
The important thing is that some problematic computers other than
Lenovo's can require the way other than 1. And some won't need anything
above, but setting active flag with gpart.
Yes, I will be adding this as an option to bsdinstall
So, as you already mentioned, these workarounds should be optional.
Ideally, prepare options for gpart, and menus for bsdinstall to choose
whichever.
Yes, my plan is to add an option during 'gpart create -s gpt' to apply
the #1 fix.
In bsdinstall, there will be the following options:
GPT
MBR
GPT + Active (#5)
GPT + Lenovo Fix (#1)
Please see also my related page[1]. It includes loader patch for 2 (but
not separate files). Newer entry on top.
As I'm using solution 1 currently, the patch isn't tested for a long
time. I'm testing if it's applicable to stable/10 or not (no build
test), and now applicable with fuzz.
[1]http://www.dec.sakura.ne.jp/~junchoon/machine/freebsd-e.html
Thank you for sharing your research
--
Allan Jude
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