Author: nwhitehorn
Date: Thu May 5 00:52:19 2011
New Revision: 221470
URL: http://svn.freebsd.org/changeset/base/221470
Log:
Fix boot on old machines (e.g. blue and white G3s) by synthesizing a
512-byte sector map instead unused space in the first 2048-byte sector.
Modified:
head/usr.sbin/makefs/cd9660/cd9660_eltorito.c
Modified: head/usr.sbin/makefs/cd9660/cd9660_eltorito.c
==============================================================================
--- head/usr.sbin/makefs/cd9660/cd9660_eltorito.c Thu May 5 00:43:55
2011 (r221469)
+++ head/usr.sbin/makefs/cd9660/cd9660_eltorito.c Thu May 5 00:52:19
2011 (r221470)
@@ -528,6 +528,25 @@ cd9660_write_apm_partition_entry(FILE *f
fseek(fd, 32 - strlen(part_name) - 1, SEEK_CUR);
fwrite(part_type, strlen(part_type) + 1, 1, fd);
+ if (sector_size > 512) {
+ /*
+ * Some old broken software looks at 512-byte boundaries for
+ * partition table entries instead of sector boundaries. We
+ * can fit 3 entries into the first 2048-byte block, so use
+ * that to humor old code.
+ */
+
+ int n_512_parts = (sector_size / 512) - 1;
+ if (n_512_parts > total_partitions)
+ n_512_parts = total_partitions;
+
+ if (index < n_512_parts)
+ cd9660_write_apm_partition_entry(fd, index, n_512_parts,
+ sector_start * (sector_size / 512),
+ nsectors * (sector_size / 512), 512, part_name,
+ part_type);
+ }
+
return 0;
}
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