Bug#801237: mactel-boot review

[Gianfranco Costamagna]

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Control: noowner -1

Unsetting myself from owners, this way somebody might pick it up.

cheers,

Gianfranco

On Sat, 19 Dec 2015 15:40:26 +0100 Gianfranco Costamagna
 wrote:
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> 
> Hi,
> 
> Any news about this package?
> 
> cheers,
> 
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Bug#801237: mactel-boot review

[Gianfranco Costamagna]

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Hi,

Any news about this package?

cheers,

Gianfranco
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Bug#801237: mactel-boot review

[Gianfranco Costamagna]

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Control: owner -1 !
Control: tags -1 moreinfo

Hi, the packaging looks fine, however I don't understand what the code
is supposed to do.

seems that the purpose of this code is to send an ioctl call and
nothing more?

thanks,

G.
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Bug#801237: mactel-boot review

[Bernhard Reiter]

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Am 2015-10-23 um 18:47 schrieb Gianfranco Costamagna:
> Control: owner -1 ! Control: tags -1 moreinfo
> 
> Hi, the packaging looks fine, however I don't understand what the 
> code is supposed to do.
> 
> seems that the purpose of this code is to send an ioctl call and 
> nothing more?

That's correct -- its sole purpose is to set an HFS+ partition as
bootable. See the included man file, and
http://heeris.id.au/2014/ubuntu-plus-mac-pure-efi-boot/#fixing-efi for
some more context.

Bernhard

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Bug#801237: mactel-boot review

[Christian Kastner]

On 2015-10-23 21:47, Bernhard Reiter wrote:
> Am 2015-10-23 um 18:47 schrieb Gianfranco Costamagna:
>> Control: owner -1 ! Control: tags -1 moreinfo
> 
>> Hi, the packaging looks fine, however I don't understand what the 
>> code is supposed to do.
> 
>> seems that the purpose of this code is to send an ioctl call and 
>> nothing more?
> 
> That's correct -- its sole purpose is to set an HFS+ partition as
> bootable. See the included man file, and
> http://heeris.id.au/2014/ubuntu-plus-mac-pure-efi-boot/#fixing-efi for
> some more context.

That article seems to contain some misinformation. For example:

  | So why is the system unbootable? The problem is that the Mac
  | bootloader expects the EFI partition to be formatted as HFS+, the
  | typical Mac filesystem.

I have a MacBook Air (2013), and the EFI system partition came formatted
as FAT. Isn't this even required by the spec?

At least with Jessie, installation was a breeze. With wheezy and
earlier, I remember having to jump a few hoops to get everything running
smoothly (like "blessing" from within OSX, and what not), but Jessie
just worked out of the box.

A one-step alternative that has always worked for me was copying
Debian's grubx64.efi to the default boot/bootx64.efi in the ESP, and
newer versions of grub offer to do this automatically for you.

[To be clear: I don't mean to say that mactel-boot isn't useful, only
that the article above should probably be double-checked.]

Regards,
Christian



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Bug#801237: mactel-boot review

[Thomas Schmitt]

Hi,

(still being subscribed on debian-mentors to learn customs)

Christian Kastner wrote:

> That article seems to contain some misinformation. For example:
>   | So why is the system unbootable? The problem is that the Mac
>   | bootloader expects the EFI partition to be formatted as HFS+, the
>   | typical Mac filesystem.
> I have a MacBook Air (2013), and the EFI system partition came formatted
> as FAT.

Because my program xorriso serves as producer of bootable ISOs,
i can tell that GRUB2 program grub-mkrescue under some
configuration circumstances wants HFS+ tree and metadata, marked
by an Apple Partition Map and blessed by whatever makes holy.
It gets this from xorriso mainly by HFS+ code contributed by
Vladimir Serbinenko.

The Fedora LiveCD ISO has a small HFS+ image file, also marked
by APM. The HFS+ image gets made as disk data file by some tools.
The ISO is made by genisoimage. MBR, GPT, and APM are patched in
by program "isohybrid" from SYSLINUX.

Debian amd64 and i386 installation ISOs still have a (useless)
APM left over from the setup described in
  http://mjg59.dreamwidth.org/11285.html
  "Anatomy of a Fedora 17 ISO Image".
That APM marks no HFS+ but only a FAT. (Made by xorriso.)

So Matthew Garrett and Vladimir Serbinenko know Macs which need HFS+
and some which do not. Steve McIntyre seems not to have had contact
with owners of the HFS+ addicts. (Me neither. I just write bytes
on amd64 hardware.)

Debian powerpc ISOs have HFS metadata without "+" and are made by
genisoimage. I am not aware whether these boot on some other,
probably even older Macs.

I understand that older Macs make few difference between HDD and CD
when it comes to booting. APM or nothing.
Newer UEFI compliant machines have to look for El Torito on CD,
and for MBR partitions or GPT on HDD. But the partition content
is in both cases the same.


Have a nice day :)

Thomas