svn commit: r316064 - head/sys/boot/i386/boot2

[Julian Elischer]

On Tue, 28 Mar 2017, Bruce Evans wrote:

[...]

> they have to fit below 640K and a few multiples of 64K are already
> used for buffers).  The limit on 8K is mainly a historical mistake.
> A limit of 7.5K simplified booting from 15-sector floppies.  18-sector

My memory says that the limit of 7.5K is becuase there was only 8k left 
free at the front of UFS1 and one sector was used for the boot0 code.


> floppies allowed easy expansion to 9K, but were unportable for a small
> gain.  The default partition layout left only 8K below the ffs
> superblock, but was only a default.
>
> Bruce
>
>