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Be compatible with boot code that starts right after the disk label in

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the second sector by only clearing the amount of bytes needed for the
disklabel in the second sector. Previously we were clearing exactly 1
sector worth of bytes and as such writing over boot code that may have
been there.
Since we do support more than 8 partitions, make sure to set all fields
in d_partitions. For the first 8 partitions this is unneeded, but for
partitioons 9 and up this compensates for the fact that we don't clear
an entire sector anymore.
Obviously, one cannot use more than 8 partitions when using boot code
that starts right after the disk label.

Relevant GRNs:
107879 - Employ unused bytes after the disklabel in the second sector.
189500 - Revert the part of change 107879 that employs the unused bytes
	 after the disklabel in the 2nd sector for boot code.

Obtained from:	Juniper Networks, Inc.
MFC after:	3 days
This commit is contained in:
Marcel Moolenaar 2014-09-12 04:15:35 +00:00
parent 04ca14cc2a
commit de3307644e
1 changed files with 4 additions and 1 deletions
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5
usr.bin/mkimg/bsd.c
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@ -76,7 +76,7 @@ bsd_write(lba_t imgsz, void *bootcode)
return (ENOMEM);
if (bootcode != NULL) {
memcpy(buf, bootcode, BBSIZE);
memset(buf + secsz, 0, secsz);
memset(buf + secsz, 0, sizeof(struct disklabel));
} else
memset(buf, 0, BBSIZE);
@ -110,7 +110,10 @@ bsd_write(lba_t imgsz, void *bootcode)
dp = &d->d_partitions[n];
le32enc(&dp->p_size, part->size);
le32enc(&dp->p_offset, part->block);
le32enc(&dp->p_fsize, 0);
dp->p_fstype = ALIAS_TYPE2INT(part->type);
dp->p_frag = 0;
le16enc(&dp->p_cpg, 0);
}
dp = &d->d_partitions[bsdparts];