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Bug#840467: partman-auto: [hppa] Increase palo partition size to 45-50 MB

On 11.10.2016 23:49, Ben Hutchings wrote:
> On Tue, 2016-10-11 at 22:03 +0200, Helge Deller wrote:
>> Package: partman-auto
>> Version: 136
>> Tags: patch
>> Can you please increase the default palo partition size
>> (on the hppa architecture) to 45-50 MB.
>> The reason is, that on a 64bit kernel we now have ~17 MB kernel size
>> and ~20 MB initrd size (both can be stored in the palo partition).
>> This sums up to 37 MB which already greater than the 35 MB we had up to
>> now. Additionally we should keep room for the future, so 45-50 MB should
>> be fine for the next few years. 
> Then what happens when you upgrade to a newer kernel ABI version?
> Shouldn't the limit be enough for at least 2 kernel and initramfs
> images?


On hppa we have the palo partition and the /boot partition.
In general the palo bootloader behaves like grub or lilo and boots
any kernel out of a /boot partition. There you have space for multiple
kernels and initrd images.

In addition it's capable to keep one additional kernel & initrd 
(as fall-back) inside it's own palo partition (where the bootloader
code itself is stored). This at least needed if you boot
from CD/DVD or via tftboot where palo doesn't have a /boot partition,
and it's possible to use the same technique on discs as well. 

Furthermore the "palo" userspace-tool to install palo and one (optional)
kernel & initrd into the palo partition is not prepared to install multiple
kernels/initrds either.
And, usually people don't update this fall-back kernel/initrd either.

So, it's safe to keep enough space for at least one kernel and initrd
(plus some space for the palo bootloader code and room for bigger
kernels/initrds in the future).  


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