From 1b404ba5ee1af230b5a640424bdb749bbe17c58d Mon Sep 17 00:00:00 2001 From: nwhitehorn Date: Thu, 5 May 2011 00:52:19 +0000 Subject: 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. --- usr.sbin/makefs/cd9660/cd9660_eltorito.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'usr.sbin/makefs') diff --git a/usr.sbin/makefs/cd9660/cd9660_eltorito.c b/usr.sbin/makefs/cd9660/cd9660_eltorito.c index f0c8b2d..fef2fda 100644 --- a/usr.sbin/makefs/cd9660/cd9660_eltorito.c +++ b/usr.sbin/makefs/cd9660/cd9660_eltorito.c @@ -528,6 +528,25 @@ cd9660_write_apm_partition_entry(FILE *fd, int index, int total_partitions, 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; } -- cgit v1.1