22.12.2015 20:05, Thomas Schmitt пишет:
Hi,
Alexander E. Patrakov wrote:
The following variants, obtained by changing only the MBR, also work:
1. Type-0 one-sector bootable partition at the very first sector:
000001d0: 0100 0000 0200 0000 0000 0100 0000 0000 ................
Did you create this by partition editor or by dd ?
By xxd, vim and dd.
While trying to mimick it, i wonder whether the "0200" should
not be "0100". I understand that the value "02" is in byte 468 = 0x1d4:
Sector part of C/H/S address of last absolute sector in partition 2.
(Plus 2 bits from cylinder part which are 0.)
The CHS information is indeed bogus in my test MBRs.
A partition from LBA 0 with 1 blocks should have C/H/S range
0/0/1 to 0/0/1, not 0/0/1 to 0/0/2.
(I am not sure how to express the end C/H/S of an empty partition
at LBA 0. 0/0/0 is not really a valid C/H/S.)
I have not tested empty partitions, only partitions with size of 1
sector or more.
------------------------------------------------------------------
There is a new GNU xorriso development snapshot uploaded
http://www.gnu.org/software/xorriso/xorriso-1.4.3.tar.gz
MD5 5163f97f5ce9a7707ac7de6777b46283
I will look into it tomorrow.
--
Alexander E. Patrakov
_______________________________________________
Bug-grub mailing list
Bug-grub@gnu.org
https://lists.gnu.org/mailman/listinfo/bug-grub
