Boot partition

[Kevin Fries]

James description is actually very good, and I will take it a step
further.  The secondary boot loader will load your kernel into ram, and
attach a working file system to it.  As part of its bootstrap, it will load
the root file system given on the kernel configuration line and mount it as
a subdirectory of the working file system.  It will at this time also
create your /sys and /proc, etc.  Once it is ready, it will do a pivotroot
command that will swap the temp root and the mounted root and call init.

So, boot does not even need to be on a mountable file system, and in many
non-intel bases systems it's not... it's in NOR memory, not the hard
drive.  Most modern systems have you mount boot, and you know why... only
one reason... so you can apt-get or yum kernel upgrades.  Otherwise, boot
does NOT need to be mounted, because it is not used after the pivotroot.

Kevin
On Sep 3, 2014 4:34 PM, "James Mcphee" <jmcphe at gmail.com> wrote:

> BIOS points to first block of the disk.  First block of the disk (MBR)
> points at secondary boot loader (grub or LILO or syslinux...  whatever).
>  That will point at the device that you mount as boot as its initial root.
>  What you see as root in your running system is loaded after that and you
> then mount in /boot what was initially the root during the bootstrap
> process.
>
> Oh, your numbers on the end.  Use 1 2 for boot.  The fs passno (the last
> number) for root should be 1, and for normal filesystems should be 2.  0
> (or blank) means don't check as part of the fstab stuffs.
>
> sorry for the ramblingness
>
>
> On Tue, Sep 2, 2014 at 8:05 PM, Michael Havens <bmike1 at gmail.com> wrote:
>
>> I am assuming that everything is cool with LFS up to this point and am
>> thinking that I am going to create a boot partition. I do have 1 or 2
>> questions about this though before we proceed. First:
>>
>> does every Linux distro search for the boot partition first?
>>
>> then
>>
>> when modifying fstab what do I put into it for the options? Here is the
>> current lfs fstab
>>
>> /dev/sda6      /            ext4     defaults            1     1
>> /dev/sda7      swap         swap     pri=1               0     0
>> proc           /proc        proc     nosuid,noexec,nodev 0     0
>> sysfs          /sys         sysfs    nosuid,noexec,nodev 0     0
>> devpts         /dev/pts     devpts   gid=5,mode=620      0     0
>> tmpfs          /run         tmpfs    defaults            0     0
>> devtmpfs       /dev         devtmpfs mode=0755,nosuid    0     0
>>
>> my only guess would be:
>>
>> <boot partition>  /boot  ext4    defaults  1   1
>>
>> :-)~MIKE~(-:
>>
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>
>
>
> --
> James McPhee
> jmcphe at gmail.com
>
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