Re: [PATCH] bless command

[Michal Suchanek]

2009/8/29 Bean <address@hidden>:
> On Sat, Aug 29, 2009 at 2:27 PM, Vladimir 'phcoder'
> Serbinenko<address@hidden> wrote:
>>> Actually, I think the correct handling is to first bless a boot
>>> directory (storing the directory id in header), then bless a boot file
>>> (add +tbxi attribute), that's why the bless command in OSX needs needs
>>> both --folder and --file option.
>> AFAIK --file has no effect for intel macs.
>
> Hi,
>
> After more testing, I believe the booting process works like this:
>
> One important difference between openfirmware and efi is that
> openfirmware stores file path in nvram, while efi stores device path.
> The default boot file for openfirmware is like this:
>
> device:\\+tbxi
>
> Which means the files which +tbxi attribute in the blessed directory.
>
> But efi only store the boot device (uuid), so it needs to use the
> blessed file to boot.
>
> So to distinguish these two situation, we can have too options for bless:
>
> bless [--bootinfo PATH_TO_BOOTX] [[--bootefi PATH_TO_BOOTEFI]
>
> --bootinfo set the blessed directory plus +tbxi, while --bootefi set
> the blessed file, this way we could specify different boot files for
> openfirmware and efi, something like this:
>
> bless --bootinfo /grub.elf --bootefi grub.efi
>

Wouldn't it be possible to do a check in bless that determines if the
file is for openfirmware of efi?

Thanks

Michal