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
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
