Boot loader too large

[Nathan Whitehorn]

On 07/11/14 15:50, Matthew D. Fuller wrote:
> On Fri, Jul 11, 2014 at 03:38:56PM -0700 I heard the voice of
> Nathan Whitehorn, and lo! it spake thus:
>> I don't honestly remember where that number came from. It's at line
>> 72 of usr.sbin/bsdinstall/partedit/partedit_x86.c. If 128 works
>> better, I'm happy to change it, but it would be nice to know what
>> the actual bounds here are before putting in a new arbitrary number.
> src/sys/boot/i386/pmbr/pmbr.s says
>
> -------------
> next_boot:.     incl (%si).     .       .       # Next LBA
> .       .       adcl $0,4(%si)
> .       .       mov %es,%ax.    .       .       # Adjust segment for next
> .       .       addw $SECSIZE/16,%ax.   .       #  sector
> .       .       cmp $0x9000,%ax..       .       # Don't load past 0x90000,
> .       .       jae err_big.    .       .       #  545k should be enough for
> .       .       mov %ax,%es.    .       .       #  any boot code. :)
> -------------
>
> (err_big being printing the "Boot loader too large" message).  Though
> 0x90000 is actually 576k, not 545, but presumably there's some other
> adjustment lopping off bits somewhere; that's 62 sectors diff.
>
> Regardless, I settled on 512k for my boot partitions (after finding
> the above error when I previously decided "it's a few dozen k, I'll
> just set aside a meg to be safe" and then discovered the whole
> "not-booting" thing that caused.
>
>

I bumped it to 512K. Thanks!
-Nathan