[Cbe-oss-dev] Mini Req to PS3 Linux boot loader (Re: PS3 Linux boot loader discussions)

[Hiroaki Fuse]

I have some comments.

> = Minimum requiremnts to boot loader for supporting removable boot 
> media =
> 
> == Background ==
> 
> This document describes minimum requirements to boot loader for
> PS3 Linux envrionment, so that system is able to boot from removable
> media/devices.
> 
> This document does NOT intend to describe requirements, so that
> system is able to boot from internal HDD. It's up to the boot
> loader's implementation, if it requires /etc/kboot.conf and/or
> how the boot loader interprets it.
> Because the contents of HDD could be changed later, to follow
> newer bootloader configuration file.
> 
> On the other hand, boot configuration file on removable boot
> media like Live CD could be changed, once released.
                              ------
                              could not be ??

> So we need minimum specification of the boot loader, so that
> any released removable boot media stay to be bootable.


> 
> === Minimum /etc/kboot.conf ===
> 
> Bootloader needs to understand following minimum kboot.conf format.
> 
> timeout=[num]
> initrd=[path1]
> root=[rootname]
> default=[label]
> [label]=[path2]  [kernel-params]
> 
> - [num] is digit number; which describes value of boot
> selection time out. It's just used as hint. Boot loader
> ignore this value.
> - [label] is a label for boot entry.
> There's no alternative entry, we can omit "label" line like;
> default=[path2] [kernel-params]

I think that default must be a label.
When we insert multiple boot media, we have to select one of them.
So we need a uniq label name.

E.g

        USB memory1
                timeout=10
                default=ps3linux12
                ps3linux12="....."

        USB memory2
                timeout=10
                default=ps3linux13
                ps3linux13="....." 

        kboot:[TAB]
        ps3linux12 ps3linux13


> - [path1] is a abosolute path name of initrd; which boot loader
> would look. That meanes the pathname has to begin with "/".
> And it's the 1st "/" stands for root dir of the file system which
> boot loader mount on seeking the boot loader configuration file.
> - [path2] is a abosolute path name of kernel; which boot loader
> would look, as same as [path1].
> - [rootname] is a name of root; which  bootloader would
> just pass to kernel.
> - [kernel-params] is a set of kernel parameters; which bootloader would
> just pass to kernel.

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